Focal length: 28mm full format, APS-C
equiv. 42mm
Mount: M39
Aperture: F 6 - F 22
Min focus distance: 1m
Length (from flange): 23/26mm [+ 11mm for the adapter], rear element protrudes 5mm
Diameter: 50mm
Weight: 60gr.
Some pictures:
A7 and the lens.
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 6.
F 11.
F 22.
Closest focus is 85cm from
outermost
edge of the lens, F 11. Focus on
the program wheel of the camera.
In full format digital this lens was kind of a deception. As far
as I remember it delivered quite good results on film with a Bessa L.
It's based on the famous Topogon design and it's slow. At max. aperture
F 6 its quite good already, a bit soft at the corners. At F 8 it's just
fine. At F 22 it
only gets soft at the edges due to diffraction, which is much better
than other lenses. This is a problem of the APS-C sensor size, not the
lens (see comparison page). The lens has no close
focussing
facilities. However it is extremely small and lightweight,
unfortunately it's
quite expensive.
