This lens hardly covers full format, it was built for 24x24mm
square format.
Focal length: 110mm
Mount: Robot M26
Aperture: F 4.5 - F 22
Min focus distance: 3m
Length (from flange): 75/78mm [+ 13mm for 2 adapters]
Diameter: 46mm
Weight: 200gr.
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 F22.
F 3.5.
F 8.
F 22.
Closest focus is at 3m,
so no close focussing picture.
This
lens hardly covers 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 relatively
small and light for a 110mm lens. According
to the serial number, this is a new lens, made in late 1999, even after
the end of the Robot production in 1996. As
you can see on the sample pictures, there is vignetting in full format
wich gets heavier by closing the aperture,
not visible on the 24x24mm Robot
cameras. And then there is a phenomenon, which did not occur to me with
other lenses: there is flare at the center of the photo which gets
worse by closing the apertures.
On film the lens is fine an contrasty.. Maybe the lens design and/or
the small M26 diameter on longer lenses is incompatible with digital
cameras.
