Canon EOS 350D with Schneider-Kreuznach Radionar 4.5/10.5cm

taken from a broken down, originally cheap 6x9 folder camera (1938)

Veijo Vilva

(Page under Construction)

  • uncoated lens with low contrast and a certain amount of lens flare
  • FOV corresponds to a 168mm lens on a 35mm camera
  • front cell focusing

  • the lens is mounted with a 43mm extension tube on an M42-to-EOS adapter.
    The extension is slightly too short so the lens will focus past infinity.
  • Prontor II shutter was retained, set at T position
  • manual focus
  • AV (aperture priority) or M (manual)


  • my test procedure isn't very rigorous
  • bad results may be caused by bad focusing as manual focusing in dim lighting isn't any too easy when the DOF for this level of expected sharpness is just a few millimeters in either direction
  • the test only shows that the specific tested lens is at least as good as my results -- even that individual lens might be better, and others of the same make and model may be better or worse
  • anyhow, the equivalent magnification of the 100% crops is just plain sick, i.e. about 48x on a typical 17", 1024x768 CRT. Normally, 8x has been considered a reasonable maximum for critical sharpness from film. At 48x magnification, a 35mm film frame would be about 172cm (68") wide, and even a 1.6x crop factor dSLR frame would be 107cm (42") wide!

At f/5.6

(full size)

A 100% crop:

Contrast is rather low. Front cell focusing isn't any too easy as it is quite difficult to prevent fingers
from getting in front of the lens.

A 100% crop from a local contrast enhanced version:

(full size)

Scaled down and post-processed:

At this scale, the full image would be about 20" wide.


Bokeh at f/5.6:

Bokeh at f/4.5:

Compare the above photo with the photo below taken with Sonnar 2.8/85 at f/2.8.
The bokeh of the Radionar is much better, in fact, almost ideal!

Carl Zeiss Sonnar T* 2.8/85mm

Note: All shots hand-held

Compare this with a photo taken with a Carl Zeiss Sonnar T* 2.8/135mm or
with a Carl Zeiss Sonnar T* 2.8/85mm or
another taken with a Super-Multi-Coated Takumar 3.5/135mm.
The bokeh here is quite nice and well-behaved.

Nothing much wrong here! (A full size copy)
(compare with a photo taken with a Super-Multi-Coated Takumar 3.5/135mm)

(compare with a photo taken with a Super-Multi-Coated Takumar 3.5/135mm)

Note: at a larger size these photos would look a little bit different, somewhat noisier
due to the requirement to adjust levels and local contrast.

(compare with a photo taken with a Super-Multi-Coated Takumar 3.5/135mm)

A 100% crop from the above photo, local contrast enhanced:

Note the text at the lower right corner! At this magnification, a photo taken with
the original camera would be about 2.7 m (9 ft) wide and 4 m (13 ft) high!
This crop would have been about 5 mm (0.2") high on a customary contact print.
The photo would look about like this as a 20" high print, only sharper.
(compare with a corresponding crop from the S-M-C Takumar photo.
Nothing to be ashamed of, here.)

In the Mirror, Darkly


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