This lens just covers full format, it was built for 24x24mm
square format.
Focal length: 40mm
Mount: Robot M26
Aperture: F 1.9 - F 16
Min focus distance: 0.5m
Length (from flange): 31/35mm [+ 13mm for 2 adapters]
Diameter: 46mm
Weight: 124gr.
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 infinity (except
closest focus). These pictures are hand-held out of the window of my
holiday home, so there might be blur by shake, especially at F16.
F 1.9.
F 5.6.
F 16, blurred due to shake with long exposure.
Closest focus (F8) is only 37cm from
outermost
edge of the lens. Focus on
the program wheel of the camera.
This
lens just cover full format, it was built for the 24x24mm square
format of the Robot cameras. The adaption to the A7 is easy, the focal
flange distance of the Robots is 31mm. That's not far from the M39
which
is 28.8mm. So you add a 2.2mm adapter to a M39 one and you are there.
M26 to M39 adapters a readily available on the web and they can be
cheap. The Robot lenses are relatively small and they are fine for
APS-C.
This
lens is much lighter than the old version (124/216 gr). There are some
more differences. This one has a 5-blade aperture, the old version is
multi-blade, perfectly round. The new version focuses down to 37cm at
F8 (old: 55 cm at F 8). Mine has faint click stops for the aperture and
it
has no firm grip to unscrew. It moves more easily, settings are easier
to read. So both versions have their pros and cons. According to the serial
number, this lens was made in 1978. It is very small
and very light for such a luminous lens
