Focal length: 50mm full format, APS-C
Mount: Contax rf
Aperture: F 1.5 - F 22
Min focus distance: 0.90m
Length (see*): 26mm [+ 19/25mm for the adapter]
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.
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.
F 1.5. ISO 100.
F 2. ISO 100.
Closest focus is 90cm from
edge of the lens, F 8. Focus on
the program wheel of the camera.
performance of this Contax mount lens is fine, although this is an
older lens which can be found for decent prices. Wide open it's o.k.
for an old F 1.5 lens, there is some halo. Stopped down it's
sharper, the halo disappears already at F 2, but it remains softer
towards the edges. The lens has no
close focussing capablities. It is relatively small and
lightweight, particularly for a F 1.5 lens. A nice lens which offers 2
usable stops more than standard. I see no diffraction at
Contax rf mount adapter is difficult to find and sometimes expensive,
but Contax mount lenses are often much cheaper than their M39 versions.
This one was not expensive and I already had the adapter. Otherwise I
would have bought the M39 version.