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Canon FTB meter

I have not used by FTB for several years and now my daughterneeds to use it for a hi school photo class. The meter wasworking fine to start with but after removing old film from who knowshow long ago, the aperture needle will not move from the lower cornerwhen adjusting f-stops. I replaced the battery to make sure theproblem wasn't there and loaded fresh film. Still the apertureneedle doesn't move. I have tried with different lenses (to besure that i didn't have a damaged one) still no difference. What am I missing????

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  • leov1957 Feb 06, 2008

    I checked that out and it seems ok. If i have the lens off and flip the mirror up should I be able to see an aperture grow or shrink as i move that lever?


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I had the same problem with this camera, I bought a new battery, and the meter was not working. I took the battery out for 30 minutes, then I installed it. I then took the lens off, carefully lifted the mirror up and down on my own, and it began to work on its own.
Besides that, I didn't do anything else.

Posted on Oct 11, 2008

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The battery only powers the meter needle. The aperture match needle is controlled by the lever that is to the right of the mirror box. You can see it with the lens off while looking at the mount. It may be bent or damaged.

Posted on Feb 06, 2008

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Film unable to advance Shutter unable to open Focussing screen unable to return

Sorry, this isn't enough information. What camera body do you have? on some models, the "lock-up" was an indicator that the battery was too low to meter properly. In an effort to keep you from taking improperly exposed photos, the manufacturer buil;t this in as a "safety feature. If your camera has a manual mode or a "B" setting, try those and if the mirror flips down, check your battery.

Feb 06, 2011 | Canon Instant Cameras

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I recently had my Canon FTb(n) 35mm camera fully refurbished and it's ready for another 40 years of service. But, how do I power the light meter? The camera uses 1.35 volt PX625 mercury oxide batteries...

You have a few options:-

1. If you shoot negatives, then just use the cheapest unstable voltage lithium equivalent (LR9/V625U). Negative film and the printing process has a wide exposure latitude and so most users won't notice any fault.

2. Use the silver oxide equivalent (S625PX) which has a stable output voltage of 1.55v which is higher than the 1.35v original. Again you can either rely on exposure latitude, or if you shoot transparencies you have the additional option of compensating by up to one or two stops as necessary by adjusting the film speed dial. As the output voltage is constant, so is the compensation for the life of the battery. Or you can get a camera technician to recalibrate the meter to suit the higher voltage. Compensating has a downside though and it's that you're effectively shifting the EV scale so you may lose some of the exposure range which your meter can cope with.

3. Use a Weincell MR625 Zinc/Air battery. This has the correct voltage but they don't last as long and cost more than the other batteries listed so far.

4. Use a CrisCam MR9 adaptor. This is a one off purchase of a voltage reducing adaptor which houses a silver oxide cell. You can move it from camera to camera, and as the voltage has been reduced rather than compensated for you retain the full EV range of your meter. If you live in North America it's cheaper to buy directly from the US manufacturer, but they charge really silly money for shipping overseas.

5. Although I have an MR9 adaptor, I've switched to using an excellent and technically superior alternative which is custom made to order by Frans De Gruitjer in the Netherlands. It's about half the price of the MR9 adaptor, has superior output characteristics which mean it's also suited to cameras with a high current drain. Or you can make your own, from scratch, using very comprehensive instructions he provides or make one using a kit he provides. If you buy them ready-built, then postage is included if ordering within Europe and they have a five year warranty. For current details on prices and availability, contact Frans at . There's no language barrier as he speaks perfect English. Unlike the CrisCam unit the adapter is supplied without a battery but you can obtain the correct SR44's easily elsewhere. Frans also allows purchasers three months to return the adapter for a refund for any reason at all.

Please note that many of the links are to a UK battery supplier. I'm not connected with them in any way, but if you're in the UK/Europe I highly recommend them. However, my reason for linking to them is solely for the comprehensive information they provide.

Good luck whatever you decide, and I trust that you will return the favour by taking a brief moment to rate my answer.

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Hello I have a vintage FTb camera and would like to know what year it is by the serial number- can you point me in the right direction?

Canon began manufacturing the FTb in 1971. You can see the page for this model at Canon's Camera Museum. Its replacement was the FTb-N, which came out in 1973. I don't know if you can find exactly when your camera was made, but it's probably safe to assume that it was between 1971 and 1973.

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Where do you put batteries in a polariod 600 one step camera?

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Good Luck

Sep 27, 2009 | Canon Instant Cameras

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I have a Minolta Maxxum 5000i. It is dead

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