The Kiev-6s can be used with a TTL prism viewfinder that has an uncoupled TTL light meter.
(The two indicators "the moon" and "the sun" light up together when the meter dial is in the right position)
The main problem is finding suitable batteries for it. It originally required a 3RTs53 mercury battery, which is unavailable today.
First, I used a power supply to test different voltages for the TTL light meter. I tried the 3.75-4.5V range. Surprisingly, the light meter was not very sensitive to the exact voltage. The difference was minimal and depended more on the accuracy of the dial rotation.
However, the light meter itself is inaccurate. It typically shows a much faster shutter speed, which results in an exposure that is up to three stops underexposed (-3EV). This does not depend on power voltage.
After the tests, I decided to continue using the waist-level viewfinder and a dedicated light meter.
By the way, would using an older, non-TTL prism viewfinder make the image brighter than a TTL viewfinder?
See also related notes:
- Kiev-6S: Budget medium format film camera (2025-06-11)
- 3RTs53 battery (2025-04-13)
- Регулируемый импульсный блок питания Gophert CPS-3205 II (2018-04-12)
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