This lens is collapsible.
Focal length: 50mm
Mount: M39
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
collapsed
Diameter: 48mm
Weight: 202gr.
Some pictures:
A7 and the lens
A7 and the lens, collapsed.
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
satellite
dish to the right of the big solar panel near the center of the photo.
F 2.0. ISO 100.
F 8.
F 16.
Closest focus is 75cm from
the outermost
edge of the lens, F 8. Focus on
the program wheel of the camera.
According
to the serial number, this lens is quite old, it has been made in 1949.
The sample pictures were taken on a stormy winter day, not ideal for
samples, the results would have been better on a sunny summer day.
Wide open it's soft at
the edges, but it's perfectly usable. Stopped down it's
sharp. Its contrast is astonishing for such an old 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. I like it a lot.
This
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
you
have to act at your own risk. Please
proceed slowly, you don't want to aspire dust into the camera.
I have another lens that 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 had 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 was tested with its flaws.
Some pictures of the defective lens:
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
satellite
dish to the right of the big solar panel near the center of the photo.
F 2.0. ISO 100.
F 8.
F 16.
Closest focus is 88cm from
the outermost
edge of the lens, F 8. Focus on
the program wheel of the camera.
The
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.
