gossen luna pro calibration

In the upper scale my Lunasix is spot-on, but in the low light scale I have more trouble due to a faulty potentiometer. It was the company's first light meter not based on a selenium light receptor. Heres what Ive done. I decided to try to check the full range of possible calibrations. It's easy! The two pots closer to the center are for adjusting offset, while the two pots that on the outside adjust the slope (more or less, they are actually cross-linked). . Hey Al, I gotta go, Fed-ex is here with another Gossen
, Luna Pro meter. Also, remember, that by default the ND filter is there, you need to press and hold the wiper towards the low-light range to remove it (it pops back in as soon as you let go). Sorry, I have never had a Lunasix F in my hands before, Your email address will not be published. Super accurate, no stinkin' fragile meter to worry about and takes a common 9V battery. Thank you. Can you tell me how I could test the individual pots? There is no right or wrong, you just have to try the different options, decide on one and then just stick to it. Do not use germanium diodes, they have too little voltage drop and you would need two of them (remember, this meter ran on 2 cells, so we have now 2*(1.55-1.35) = 0.4V to lose. Remember, that the upper scale end is more accurate and around cross-over between the scales just take the reading from the lower range as more reliable. ISO Automatic, Exposure Compensation, Active D-Lighting, HDR, Picture Control, etc. You may have inadvertently used an old germanium type (such as 1N34) which does indeed drop about 0.4V. Gossen Lunasix F / Luna Pro F Calibration - Photrio.com Photography Forums Smooth as butter! Find out more about the functions included with exposure meters and how to use them, as well as the characteristics of light, white balancing and much more. Solder the diode into the negative wire, the small bar on the diode housing shall point towards the battery compartment (see photo to the right). Vintage Gossen Luna Pro ASA CDS Ambient Photo Light Meter with Case - eBay The exposure values are derived directly from the incident light, regardless of the objects color, brightness and reflectance. For analogue photography, you can use slide film. how to read and calibrate a Gossen Luna Pro SBC or profisix Request Sales Contact I dont know enough about electronics to figure out what could compress the range so much, or why no adjustments make a difference. it is packed with info, with flash capabilities, and is easy to read. Jan 23, 2015. The meter draws a minute amount of power and so the voltage drop across a small-signal (thin and steep P-N junction) silicone diode will be less than 0.7V that a meter (testing at say 2mA) will show. Gossen Lunasix - Camera-wiki.org - The free camera encyclopedia It's easy! Hi Marek, Gossen MetraWatt Luna-Pro sbc Instruction Manual Some thin insulated wire and a few resistors evenly spaced in the range of 1k 220k. 90471 Nrnberg Weakness: none. Measuring devices for irradiance and illuminance used in non-destructive testing must be recalibrated regularly. For calibrating using an ohmmeter you take the cell out anyway. It will also prevent any surprises with batteries put the wrong way around (the original 625 cells were mechanically keyed, the replacement SR44 arent, this isnt really a problem as Lunasix wont be damaged by reversed voltage polarity). GOSSEN Foto- und Lichtmesstechnik GmbH . slope l .6 .3 I've never used handheld light meters before but I've been meaning to get one since I have some cameras that don't have meters built in or they are non functioning.

, I've used a good deal of meters and to say which is the be would be an overstatement. The 1977 Gossen Profisix (in US Luna-Pro sbc) is a professional "system" exposure meter that can be fitted with a range of electrically connected accessories offering additional measurement facilities, including flash, enlarger metering, and colour temperature. Gossen Lunasix Hand-Held Exposure Meter with Leather Case-Good - eBay http://www.butkus.org/chinon/batt-adapt-us.pdf, https://www.amazon.com/gp/product/B06XRN7NFQ/ref=ppx_yo_dt_b_asin_title_o05_s00?ie=UTF8&psc=1, Kandinsky ,,concerning the spiritual in art'', On CdS meters principles, basics and examples. T +49 911 800621 0 . The plate is glued in, you have to pry it carefully off taking care not to bend it too much. Switch the camera to manual mode and deactivate all functions that affect the exposure. You will probably say that this is all a lot of work and we can only agree with you. Much later I tried to calibrate it and discovered that a good calibration wasn't even possible. Since changing the voltage from mercury to alkaline threw the meter off, the changing voltage of the alkaline battery will keep changing indications of the meter. #1. Gossen Luna Pro F meter: Battery check - Photrio.com Photography Forums It is the gray plastic one. I've got a functioning Digital-Pro Digital, except I can't get the down button to work. c 0 .6 + For this purpose, a hemispherical dome covering a spherical measuring angle of 180 with a light transmittance of 18% has been placed in front of the sensor. An observant reader might have noticed, that the CdS cell does not change during calibration. Home; About; Contact; Resources ; Remember, that Canon dSLR usually have about ASA125 equivalent on ISO100 setting. Because of this, in most cases it is possible to readjust the meter for 1.55V silver oxide cells with no further hardware modifications. Decades ago it was the "required" meter when I studied photo at RIT. May I suggest you to write an article about those old selenium meters and the way to restore them with the electronic components available today? It comes with a very nice case and a shortcut instruction card. It is the gray plastic one. RE insert batteries. For collectors, the English website www.myphotoweb.com by Ed van der Aa is a veritable treasure trove of the history of GOSSEN and information on the historic equipment. NEXT THING: what does the battery check say? Okay, so it seems that the gauge and the ND filter are okay. Three of which I have recalibrated to take the Silver Oxide 1.55v batteries, and it would be tough for me to give up any of them. ISO 100, in the external exposure meter and the camera and make sure that all correction values are at 0. Simple and highly effective. I dont know, what internal differences are between my and yours models. Does that (in spite of the added bulk) seem viable? Sun 26-Jul-15 08:23 AM | edited Sun 26-Jul-15 08:25 AM by ColColt. Now, I still use a Pentax Spotmeter V and a very nice Lunasix F from time to time, and I figured my son could learn from the use of the Lunasix, so I jumped on it. What happens when you REMOVE the ND filter completely and take a reading for highlights/shadows? We would like to give you a brief overview, which values are relevant to the assessment of horticulture lighting and how they can be measured. Powered by Invision Community, There's also some free Gossen manual downloads at, how to read and calibrate a Gossen Luna Pro SBC or profisix. For collectors, the English website www.myphotoweb.com by Ed van der Aa is a veritable treasure trove of the history of GOSSEN and information on the historic equipment. r 3.3 +, low range Two of the meters have use Mallory PX 635 or PX 13 batteries in it. What do you think about voltage 2,8 instead of 2,7? Remember the exact needle position to tell any voltage drift in the future. Thanks for this info on the Lunasix 3, it helped me in putting the diodes in place to get the right voltage drop. I appreciate that your article is a few years old now, and wonder if you might have info on the Gossen Lunasix F meter? A wall in a windowless toilet can be as dark as EV-3, a whitewashed wall outside in the sun will hit EV17, try your best to fill at least the gray marked range in the spreadsheet. First, disassemble the meter and unsolder the negative battery wire as before. In contrast to the reflected light measurement of the camera-internal exposure meters which measure the light reflected by the object, the external exposure meter measures the light falling on the object. You need to unsolder at least one of them (if you prefer to do a minimum of disassembly, unsolder just the one going to the negative battery pole, its closer and easier to reach). Ive worked on Simpson meter movements before and sometimes they bind. The two on the right are for Hi light readings
, These work together to get the accurate readings. Unfortunately, plastic 'spring' clips tend to get brittle over time, and even the action of initially pushing them together tends to weaken them. there are only resistors and the galvanometer in it, no diodes, no transistors, no fancy electronic circuitry. questions, or feedback. Choose the camera, the lens and possibly the film you work with most and define this as the standard setup for all further calibrations. Marek. Do it on normal metering mode, not on the battery check (battery check draws more current AFAIR). Once hold the light meter in front of the object / model and you have already determined an exact exposure time and aperture that is certainly right and provides a much easier starting point for image processing. Something like this: https://www.amazon.com/gp/product/B06XRN7NFQ/ref=ppx_yo_dt_b_asin_title_o05_s00?ie=UTF8&psc=1 ? On the older meter what is the significance of the Six? I have corrected the text. it reacts to light too. Today, Schottky diodes are a more common and reliable low barrier type that drop about 0.4V, such as type 1N5711. Diode drop is current dependent, but not very much. Order our light meters and accessories from the GOSSEN FOTO- UND LICHTMESSTECHNIK GMBH online shop. Marek. The left pair is responsible for low light range (1-12, no ND filter), the right pair for the high light range (12-22, ND6 filter in the light path). You recommend any small diode. If you have any numbers that I can compare to, that may or may not be useful. Gossen luna pro battery replacement?? - large format photography I was ready to pull my hair out before I finally realized what was going on.
, I finally got me a flouresenct light buld and a box and cut some filters out of 120 film blank and measured the
, light coming through the filters until I had four reading EV3, EV6, Ev8 and Ev16 and adjusted that way. high range Our photometry compendium answers questions covering all aspects of the issues of light, basic lighting technology and colorimetry terminology, tips for the selection of measuring equipment and an overview of applications and standards. V() is the spectral luminous efficiency of the human eye in daylight. Our new compendium answers questions covering all aspects of issues associated with handheld exposure meters in digital photography. It should be a centered peak. It has to be a digital one, as much as I love analogue meters they are not accurate enough for this task (with a few noble exceptions, but if you have one of these youd know it). For high light: use EV12 (19 on the dial) and EV8 (13) instead, and tweak the right two pots. Marek, The filter appears to be fine. All is not lost if the clips break, since most plastic cases can be held together with a contact adhesive like Evo Stik. You will not gain much anyway, because the adjustment has to be done in very fine increments and so putting some sort of a scale on each pot will be useless. And by the way in my instructions above, that should read a Single edge razor blade. The battery in it was . Do the batteries stay in the compartment when calibration? I tried to give the spring one more turn, to see what happened, but also this didnt work. The voltage drop across a diode depends on the current folwing through it. Being a purely passive, resistive, linear circuit it has no principal problem with a slightly higher battery voltage, besides showing wrong exposure values of course. The other meter is for average day light. Local time 1:07 AM Joined Feb 22, 2005 Messages 723. Augie. Take a route around your house, in and out. Marek. At the motif level, you now measure in the direction of the incident main light and get a combination of time / aperture that should lead to an exact exposure under this illumination. but at 5 I have to turn the offset pot all the way down just to get the unit to read about 6.5. Recommended Posts. it should calibrate anyway. Yesterday I stumbled upon a very nice, mint-looking original grey Lunasix at a garage sale. They're quite small (smaller than the heads of the four long screws that hold the halves of the meter body together), sort of a clear amber color, and they seem to be made out of silicone. Chat with Sales. Maybe I can get around that like this. I got it back in, I thought exactly right, but when I close the case the range switch wants to bind. For EV12 at iso 100 its actually 17 on the dial not 19. Thread starter phototone; Start date Apr 4, 2005; Latest activity Latest activity: May 11, 2005; Replies: Replies 7 Views: Views 3K P. phototone Well-known. r + + +. Get the best deals on Gossen Gossen Luna-Pro Analog Photography Light Meters when you shop the largest online selection at eBay.com. Sold for many years the Lunasix was famed for its low light sensitivity, still impressive by today's standards. If I understand correctly, the two sets of pots are on independent circuits, so this would seem to rule out a single bad pot. If your meter was dead-on with mercury batteries and the meter needle on battery check stops now within the red field you are most likely done. Light is detected using a CdS (Cadmium Sulphide) LDR (light dependent resistor) that directly influences amount of current allowed into the galvanometer. They are visible on the adjustment pods picture above, and the screws holding the bottom part travel through them. It takes me about 30 minutes.
, The two POTs on the left are for low light readings. This article describes, how to deal with this problem. . While many meters can be easily calibrated in one-shot by computing necessary resistor values and just setting them, Gossen meters make this approach extremely difficult by using a non-linear scale. Anyone know how to Calibrate Gossen Luna Pro? | Rangefinderforum Luna Pro SBC Calibration (ColColt) - nikonians.org Now if you mess up don't blame me, send me your unit and I will adjust it for you. Makes the think the scale is off. Earlier models can be used with later batteries by simply setting a different ISO. I assume the meter is reading generally something, i.e. They right one is: Thing is, the mechanical toggle lever on the meter has three positions and both: moves mechanical components within the meter and switches the meter ground around, so its not so easy to wire an additional dc/dc in, bigger mods are necessary. take a resistor that has a value appropriate for something close to EV0 etc., you get the drift. check it out. I was thinking about using LD6806 low dropout voltage regulator instead of your solution. It beats my Canon 20D built-in meter in terms of actual low-light performance by 5 stops. I have a slightly different question you may know the answer to. My Luna-Pro could use little TLC. Its possible to achieve stable 2,8V (I require 21,35V for lunasix) enclosed in one small simple circuit. Set your lightbox to EV0 and adjust the offset to make dial read `5. wayne_willis2. Very fresh silver oxides will be 1.6V, so better take ones that are good, but not right-out-of-the-box. Thanks. ON Semiconductor NCP551SN27 (of their NCP551 series) drops about 0.3V so a regulated 2.7V will be maintained until your battery goes below 3V (solder a 100K resistor between Vin and Enable). The ND filter is very close to 6 stops, but just in case: mark your measured values taken with and without ND filter to track them back later, shall discrepancies show. And, I suggest you search the photo.net archives (and google, while you're at it). Request Repair / Calibration It sounds right about the placement. The gamma value is 0.4, with no reading more than 11% off. Soldering iron, some solder and a little flux (or colophony). After I open the light meter, the indicator (without any battery in compartment) when checking battery is not going to the rest posision on the left of graduated scale. Followers 0. I have a black Lunasix 3 (model 6D) which has hardly been used over the years. Don Quixote, alias Alexander Heinrichs, battling the heathens or why is an exposure meter important and sensible for photography. How to calibrate a Gossen Luna Pro - Classic Manual Film Cameras Thanks, that was a mistake: it should read EV14 (19 on the dial). I rebelled and used a Weston Ranger 9 that I truly loved, but it wasn't accurate and I got sub-par results much of the time. At the same pad, as the battery wire, arrives another one, in a yellow sleeve (or at least it was yellow in my meter). What alternatives are there for this battery? With a total of 11 units adjusted
, Now take a look at the photos.

, Which Gossen light meter do you think is the best? The use of an exposure meter pays off in order to be able to keep the lighting situation under control at a photo shoot. It may not display this or other websites correctly. Share More sharing options. offset Something to be aware of: there are two small silicone-like rings that may fall out. Read an excerpt from the June 2015 edition of trade journal Gebudedigital here, and find out more about required safety and health protection with regard to workplace lighting. Request Technical Support But the major problem is that the indicator needle is stuck at the right of the display. Ive checked the voltage when the meter is on, and it looks correct. I've got a functioning. "RE: Luna Pro SBC Calibration" | In response to Reply # 1. This is for a properly working, calibrated meter. Installing a diode is a sensible and cheap solution to the dilemma. In comparing the Gossen's readings to my Nikons built in meter and my iPhone metering app, the Gossen consistently reads nearly four full stops under the . Thats assuming you did not adjust the battery check trim pot. Basic Operating Instructions . For each setting I compared readings with and without the filter. As per my expereince multiple pots are there to balance particular points in the meters range. The "Profi-System" line continued and ended with the Mastersix . However, some months ago I dropped the meter and it has been sticking, intermittently. This page may not be sold or distributed without Somebody correctly commented that silicon diodes drop about 0.7 Volts. The second approach is easier for a casual tinkerer, it requires more steps and could take more time, but makes calibration without a good reference set possible. It is recommended to use a tripod so that the image section remains constant. The right combination of ISO value, shutter speed and f-stop results in a correctly exposed image. Towards the bottom of the PCB you will find four trimm-pots available through holes in the pcb (see photo). You
, must turn the screw very, very slowly.
, Now you are ready to check for accuracy with an accurate meter, a digital camera is a good source.
, This is not for the faint of heart, you must be extremely patient. slope l .6 .3 If its contacts are corroded (oxidized) nothing will work reliably. At 10 I can adjust the slope pot to read 10, Get it pleasantly warm to the touch, but not very hot! If it doesn't
, turn the adjusting screw (potenciometer ) listed as (1) in the photom and set it to the far right in the red. Hi Merek, youve written a most comprehensive article on recalibrating the Lunasix 3. Tektronix designs and manufactures test and measurement solutions to break through the walls of complexity, and accelerate global innovation. Is this a problem or is it normal? Now turn the instrument over and carefully remove the front half of the of the meter. As with most Gossen devices theres going to be some aluminum plate involved In this case its the back plate of the meter. 2nd: Adding a series resistor Rs = Rgalv (Rgalv || Rp) = Rgalv Rgalv^2 * 6.75 / (Rgalv * 7.75). Juanjo, Restoring selenium meters is somewhat tricky, because they all are mechanically compensated. What alternatives are there for this battery? If you want to approach the problem systematically, you have to take ldr variability into consideration. If you cant get this meter into calibration it means some of the components have failed, i.e. But here's my question I can't remember. I hope you can help me with this. Tektronix multi-brand commercial calibration services can calibrate more than 140,000 instruments from 9,000 manufacturers, including the following models from GOSSEN. For me it would be one that was not too expensive, complicated and accurate. Do you have any suggestion before i drop it? What you claim is a common belief, but it is easily proven wrong. There are two approaches to calibration: you can either do it directly, by exposing the meter to different light levels and succesively adjusting the trimm-pots, or indirectly, by recording the LDR characteristics and calibrating with substitute resistors. The bottom recesses are for attaching a lanyard and I hadn't thought that was a separation point for the case. You need to be a member in order to leave a comment. The aperture and shutter speed determined by the meter will be manually transferred to the camera and the first shot will be taken with these values. For low light is where the Luna (moon) light come into play. Deviations from the nominal values are also possible with the shutter speeds of your camera and the apertures of your lenses. T +49 911 800621 0 . Gossen Luna Pro Repair Article. Can you offer any help on how to get these parts back to where they belong?

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I have a Luna Pro SBC that was off and there is one adjusting POT on the left front as you look at the back pointing it as if you were using it. Feb 12, 2004 Hey all, I've got a Luna Pro F that is going fritzy schizofrenic on me (needle jumps around a little.looks like it's paranoid about giving the right exposure lol).and so I'm thinking the selenium cell is going out. Thanks an awful lot for this very useful post. So I had forgotten. Gossen Luna-Pro Digital F Light Meters - PhotographyReview Learn how your comment data is processed. The bronze arm of the rocker switch goes through it. For a better experience, please enable JavaScript in your browser before proceeding. The negative news is that these benefits are not for free and you may get worse results on the first use than with the cameras light meter. Normal, center-weighted is best. 920 Posted December 8, 2008 <p>Remove Batteries, Zero meter. I just bought a Gossen Luna Pro (the original model) enlarging attachment, but it is coming with no manual or instructions. Don't loose the meter zero adjusting screw. 3 in x 2.5 in. c .3 1.6 Augie. If it reads good above 13 on high, and above 4 on low, just accept it. There will be, from the outside towards the inside: The last element in the list you have to be extremely careful about: it will likely spring out if you try switching the meter on. This is still not good for a pair of alkaline 625 cells, but will do very well if fed with a lithium cell. Not catastrophic) aging of the ldr cell. The bracketing function of your camera can help you with this series of tests. If you use a meter built into some camera, make sure it isnt in matrix metering. Contact Sales for product demos and consultations. Andrew - If I remember correctly, the Gossen Luna Pro F took a 9 volt battery. Learn more about UV radiation, its generation and the various areas of application. Pretty much every meter will be a case on its own how to tackle these problems, Hi, Plants perceive light differently than humans. Does that switch turn the meter on and off too? If you compare the recordings with the presentation on the camera-internal display, then you can experience some surprise. The Gossen Lunasix is a purely passive circuit, i.e. Find out more about the functions included with exposure meters and how to use them, as well as the characteristics of light, white balancing and much more. It uses a 9V battery.
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The part you have shown is the diffused glass mirror and in the bottom right corner is a slot that must go to the top right as you are using the meter. Unless your lightbox is calibrated in EV, you will need a known, good, accurate light meter. So dismantling is entirely at your own risk. l c r LD6806 needs also about 1mA current draw for proper stabilization, so you need to add dummy load to Lunasix internal circuitry. Have a closer look under the galvanometer dial. Rgalv is the inner resistance of the galvanometer. The pages are in excellent condition with no rips, tears, or writing. Once one leg is free, connect two thin, flexible wires to the LDR one to each leg and route them out of the meter. And have yourself a great day. Dont forget this meter consumes well under 1mA under normal operation. UNFORTUNATELY, while I was screwing around the half-silvered mirror popped out. I oriented it so that the clear opening replaces the silvered side when in low-light mode, I assume that is right. or (hardcore) a programmable calculator with statistic functions. Copyright 2023+ Photo.net One is the part shown in the photo, which would seem to fit in the slot between the opening in the meter housing and the sensor lens. The GOSSEN company has been producing a variety of exposure meters and light meters since 1933. The "zone scale" of the Gossen Luna Pro SBC expsure meter this meter is the standard for professionals. Remember you can cheat: you can set EV6 and put the ND in, when on low light range, to get EV0, and you can set EV6 without ND on high lights to get EV12. l c r With its three product lines for spectral photometry, photometry and photography, the company has established itself as a reliable manufacturer of meters and systems, as well as a competent partner for customer-specific OEM solutions. Required fields are marked *. your blog is the best source for understanding and adjusting the Lunasix 3, I encourage you to continue with it and share your knowledge with every of us. Do you get any readings on any scale? Manual and automatic exposure metering systems integrated into the camera have long since been standard equipment for professional cameras too and especially for dynamic subjects. I dont remember what exactly did I put in, sorry, BTW: you can do a simple test: mount the diode externally (rig up a set of batteries and a diode in series) and measure the actual voltage drop upon activating the meter. What would cause the meter needle to stick at the extremes of the scale? A sewing needle or a sharp pin might prove useful. Your article is by far the best! I used +/- when the readings were out of range. I see now that all extra whitespace is removed. If its off by a little and the offset is close to constant across the range, note this offset and compensate with film speed setting. c____0___.6____+ Today I was working on my Luna Pro, and its been years since I last worked on them. I have recently soldered on a new connector and find my readings are no longer accurate. But dont put a diode just yet in. My hat's off to you. Is it possible to adjust that? Inspect the left-top side of the meter. correspond, and note it down. Our new compendium answers all questions about UV measurement technology. Watch this video on how to work with exposure meters! the other are two tiny washers or spacers. The needle ist braked if the button isnt pressed, so it wont return to zero. (The meters been in my family since new, and though it hasnt seen much use, its had a couple of falls from my vest to a hardwood floor.). 5 I. (Not working with EVs because Im calibrating this meter to work with my new sony fs100 video camera, which only offers ISOs of 3200,1600, and 500, which I have to traverse to match the Lunas sensitivity.)
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