This lens is collapsible.
Focal length: 50mm full format, APS-C
Mount: Contax rf, but
have a look at the last paragraph
Aperture: F 2.0 - F 22
Min focus distance: 0.90m
Length (see*): 11/22mm [+ 19/25mm for the adapter], tube protrudes 22mm to the back when
mount is quite different. In fact it's two mounts. The inner mount has
a focussing helical, so the standard lenses don't have one. The outer
mount is for other lenses which have their own focussing device. Its
difficult to measure. I have taken the locking pin for reference.
A6000 and the lens, collapsed
A6000 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.
Closest focus is 80cm from
edge of the lens, F 8. Focus on
the program wheel of the camera.
This is the oldest lens (except large format) that I own. According to
the serial numbers lists on the web it's from 1937. Wide open it's soft,
but it's perfectly usable. At F 8 it's
sharp. At F 22 it hardly gets blurred
due to diffraction, it's better
than other lenses. Its contrast
is astonishing for an uncoated 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 the adapter to
collapse it, it doesn't collaps as far as some M39 versions, but you
have to act at your own risk. Please
proceed slowly, you don't want to aspire dust into the camera. The
adapter is difficult to find and
sometimes expensive, but Contax mount lenses are often much cheaper
than their M39 versions.
lens can be collapsed into the A6000. Please push cautiously, it
collapses into the adapter, but again it's at your risk.