How to use the meter of a MF Finder S

[roberto_lins]

I just bought a used MF finder S, which came without a manual. I've

put it in the camera (SQ-Ai) and it seems to work fine. Aperture is

now controled by the prism. However, I cannot figure out how to use

the TTL meter of this prism. A second question would be what "TTL full

aperture" means. Would the readings be taken only for the lens in its

largest aperture?

 

Thanks in advance for any help and/or comments,

[roberto_lins]

Ok, here I come to answer my own question and therefore to keep it for posterity. After reading old manuals for other prisms and playing with

the one I got, here are the findings.

 

The dial on the right side has a "lock" lever that (obviously) locks

the silver buttom right in the middle. When unlocked you can press it and one of the three dots in a LED in the left side of the viewfinder will shine. A red

"-" lights up for underexposure, a green "o" for correct exposure and a red "+" for overexposure.

 

The readings take into account the aperture set on the lens (without the need of use the DOF preview), the shutter speed set on the dial and ISO and any exposure correction settings at the film back. So, just set the shutter or aperture and adjust the other until you get the green dot. Precise, easy and nice to use. The image still reverse , but I personally don't mind it. Definitely makes life easier whenever the use of a lightmeter (which I still prefer) is not possible or convenient.