Canon cononet QL 17 GIII

[Sweetlou42]

Not completely. That battery will allow you to confirm that the meter is working. Initially, it will give you readings that are probably close enough for b/w negative work. After a bit of use, the voltage will drop to the level where it's spot on (but you won't know when that is). Then it gets to the point where the voltage is too to be accurate. My suggestion is to go ahead and use it for a while (maybe 20 rolls?).

That will give you time to order the adapters from Jon Goodman or from ebay (cheap if they come directly from China). Zinc Air require air to activate, so make sure any adapter you get has a hole in the bottom for air to reach the zinc air cell.

Also, you may want to try the adapter with a silver oxide (1.5v) battery. You may find that you can compensate by changing the ISO setting. But the Canon ISO settings may not be precise enough to do this. I think higher voltage gives lower exposure, so you would have to "fool" the meter by setting an ISO value lower than your film's ISO value.

I have adapters and betteies coming in this weekend so I’ll find out pretty soon
I received the Yashika gsn today with battery already in, light meter works , I think, , gonna try tomorrow with a Kodak 400tx film

 

[Sweetlou42]

This photo shows 3 of the adapters but for the Canonet GIII you will only need one. Just wanted to show the aluminum and brass as well as the vent hole in the back of the aluminum one. The 675 zinc air batteries can be bought in value packs. the card I have in the photo was from a 24 pack if I remember correctly.

Great advice, thank you