Does the viewfinder light of the F-1N affect the meter reading?

[wolfgang_dreher]

<p>Hello!<br>

I just received my Canon F-1N with the Eye-level finder FN. The light meter works fine, but if I turn on the viewfinder light, the meter reads several f-stops more. I couldn't find anything about this in the manual. Is this behavior correct?<br>

Thank you a lot for your responeses in advance.<br>

Best regards<br>

Wolfgang</p>

[john_tran14]

<p>You should check if the battery is strong enough, or just try a new battery</p>

[howard_m]

<p>my F1n never did that.</p>

[tim_siekiera]

<p>no this is not supposed to happen. i have owned several f-1 variants, including 4 with the ae prisms and never had a meter behave thus. you may want to pull the focusing screen and check to make sure it is the correct one. i do know that the meter will be thrown off if the PRISM is removed and light hits the screen from above.<br>

om a hunch you may have an f-1 screen in a f-1n body. if memory serves (20yrs ago) they were interchangable, but did not meter correctly.<br>

also be warned that the f-1n uses a silicon blue chip for mertering and you can only use circular polarizers. the standard/linear will NOT meter correctly. (found out the hard way, 20 rolls of k-64 from vaccation)<br>

luck, tim</p>

[wolfgang_dreher]

<p>thank you a lot for all your responses, it was in fact due to a weak battery. It probably took to much power to run the meter an the light...<br>

Best regards<br>

Wolfgang</p>

[james_kennedy9]

<p>"also be warned that the f-1n uses a silicon blue chip for mertering and you can only use circular polarizers. the standard/linear will NOT meter correctly. (found out the hard way, 20 rolls of k-64 from vaccation)"</p>

<p>I think that is the F-1N. The F-1 original and F-1n used CdS meters.</p>