This lens is collapsible.
Focal length: 50mm
Aperture: F 2.0 - F 16
Min focus distance: 1.0m
Length: 24mm collapsed, 43/47mm [+ 11mm for the adapter], tube protrudes 17mm to the back when
A7 and the lens, collapsed
A7 and the lens, extended.
Sample pictures: You may click
on the sample image (except closest focus) for full resolution. The
full resolution image opens in a new window, so you can keep it open
for comparison. Focus is on the
dish to the right of the big solar panel near the center of the photo.
F 2.0. ISO 100.
Closest focus is 88cm from
edge of the lens, F 8. Focus on
the program wheel of the camera.
This lens has had an accident, the front lens couple has separated in a
large area, visible on the photos. I would have re-cemented the couple,
if I found a way to take the couple out of its ring. The ring unscrews
easly, but the couple has been pressed or peened into the ring. No way
to get it out at reasonable cost. Any proposal would be welcome. So
it's tested with its flaws.
picture results have stunned me. There is a soft area, like an
overcast, down to the right. But the rest is still much better than I
thought. Wide open it's a bit soft at
the edges, but it's perfectly usable. Stopped down it's
sharp. Its contrast is astonishing for an old and battered lens. The lens has no
close focussing capablities. It is very small and
lightweight, particularly for a F 2 lens. A nice old lens which offers
one usable stop more than a standard lens.
lens is collapsible. There is enough room inside my camera to
collapse it, it doesn't collaps as far as some other M39 lenses, but
have to act at your own risk. Please
proceed slowly, you don't want to aspire dust into the camera.