Forest_rain
Well-known
I salvaged this from a broken Zenit E that I have. This is the focusing screen/ground glass. No markings whatsoever...there is also a little metal spacer that goes under (last picture). I'm not sure if I should use this or not.
It looks like the glass is curved on the top, perhaps to give it a magnifying quality? My question is will this give accurate focus for calibrating infinity focus with a loupe, or will this magnification throw it off.
Update: the viewfinder has a slight magnification to it. I removed it from the top plate, it has maybe 2x magnification. Perhaps this is designed to be used in tandem?
The only other flat ground glass I would have to scavenge from an extra retina reflex s with slightly off shutter speeds. Plastic focusing screen with split screen center spot.
It looks like the glass is curved on the top, perhaps to give it a magnifying quality? My question is will this give accurate focus for calibrating infinity focus with a loupe, or will this magnification throw it off.
Update: the viewfinder has a slight magnification to it. I removed it from the top plate, it has maybe 2x magnification. Perhaps this is designed to be used in tandem?
The only other flat ground glass I would have to scavenge from an extra retina reflex s with slightly off shutter speeds. Plastic focusing screen with split screen center spot.
Peter Jennings
Well-known
As long as the part that mimics the position of the film across the focus plane is flat, then you are good.