|
Topic: |
Yashica
3.5/40 Enlarging Lens |
|
Author/Copyright: |
John Jovic |
The Yashica 40mm F3.5
enlarger or enlarging lens is pictured below.
Specifications
The specifications shown below are from personal observation and
measurement.
| |
Yashica
3.5/40[pc] |
| Focal Length (mm): |
40 |
| Maximum aperture (F): |
3.5 |
| Lens construction (elements - groups): |
|
| Angle of coverage: |
|
| Recommended negative size (mm): |
|
| Minimum aperture (F): |
16 |
| Number of aperture blades |
6 |
| Designed magnification: |
|
| Useful magnification range: |
|
| Achromatized wavelength range (nm): |
|
| Distortion at basic magnification (%): |
|
| Focal length design value (mm): |
|
| Barrel outer diameter A (front) (mm): |
|
|
Flange mount thread size: |
M39x1.0 |
|
Filter size (mm) |
M40.5 (pitch unknown, possibly 0.5)[pc] |
| Barrel outer diameter B (rear) (mm): |
|
| flange focal length (mm): |
|
| Back focal length (mm): |
|
| Distance from flange surface to the second principal point (mm): |
|
| Principal point spacing (mm): |
|
| Total length (mm): |
|
| Weight (g): |
|
| Coating: |
coated |
|
Application Notes
The lens was fitted to a Canon 5D2
using a readily available M42 (x1.0) to Canon EF adapter, an M42 (x1.0)
helicoid of approx 13mm-20mm and an M42<M39 adapter to which the M39
mount lens was actually fitted. In this configuration it was not possible to focus beyond a very
narrow range around approx 150-200mm, see sample images below.
The lens was also tested using a Canon 5D2 with a Nikon PB-4 bellows. In
this configuration a hotspot became evident at certain magnifications
although the lighting conditions (light table, ie very bright
background) probably contributed to this, as did the lack of a lens hood
(due to a damaged filter thread) and the hotspot may have been far less
evident in normal conditions.
Sample Images
The lens used in this test was in poor condition and was received
with fungus on all exposed elements, including inside the lens. The
fungus was cleaned however one of the internal elements had been
permanently etched and damaged by the fungus so was impossible to clean
fully. The lens was also dented significantly although this does not
seem to have affected optical performance however the lens is no longer
capable of taking any lens hood or filters due to a damaged front filter thread.
The inability to have a hood fitted does matter with this lens as it
showed a tendency to have a flare or hot spot at high magnifications and
with strong backlighting, such as on a product table (eg. the images of
the lens below).
Overall this lens seems to perform well optically, despite fungus
damage. The sample images below have not suffered from a noticeable loss of contrast
and have been processed as normal.
Colours are quite saturated straight out of the camera, despite the lack
of a lens hood.
Wide open sharpness is excellent even outside the central zone although
sharpness increases as the lens is stopped down a little.
Bokeh is harsh behind the plane of focus and soft in front. The harsh
bokeh may be used for pictorial effect, particularly if the lens is used
with a mirrorless camera having a much shorter register, thereby
enabling the lens to focus much longer distances, possibly to infinity.
The lens was only tested on a Canon 5D2 (which has a long register) so the focus range was very
short and narrow, not much more than approx 150mm using a short helicoid.
|
|
 |
|
|
|
Photographed with a
Yashica 3.5/40 enlarging lens at F3.5 on Nikon PB-4 bellows.
|
|
|
|
|
|
|
|
 |
|
|
|
Photographed with a
Yashica 3.5/40 enlarging lens at F8 on Nikon PB-4 bellows.
|
|
|
|
|
|
|
|
 |
|
|
|
Photographed with a
Yashica 3.5/40 enlarging lens at F3.5 on a helicoid and a Canon 5D2 |
|
|
|
|
|
|
|
 |
|
|
|
Photographed with a Yashica 3.5/40 enlarging lens
at F8 on a helicoid and a Canon 5D2 |
|
|
|
|
|
|
|
 |
|
|
|
100% unsharpened crop
at F3.5 |
|
|
|
|
|
|
|
 |
|
|
|
100% unsharpened crop at F8 |
|
|
|
|
|
|
|
 |
|
|
|
Photographed with a
Yashica 3.5/40 enlarging lens at F3.5 on a helicoid and a Canon 5D2 |
|
|
|
|
|
|
|
 |
|
|
|
Photographed with a
Yashica 3.5/40 enlarging lens at F8 on a helicoid and a Canon 5D2 |
|
|
|
|
|
|
|
 |
|
|
|
100% unsharpened crop
at F3.5 |
|
|
|
|
|
|
|
 |
|
|
|
100% unsharpened crop at F8 |
|
|
|
|
|
|
|
 |
|
|
|
Photographed with a
Yashica 3.5/40 enlarging lens at F3.5 on a helicoid and a Canon 5D2 |
|
|
|
|
|
|
|
 |
|
|
|
Photographed with a
Yashica 3.5/40 enlarging lens at F3.5 on a helicoid and a Canon 5D2 |
|
|
|
|
|
|
|
 |
|
|
|
Photographed with a
Yashica 3.5/40 enlarging lens at F3.5 on a helicoid and a Canon 5D2 |
|
|
|
|
|
|
|
 |
|
|
|
Photographed with a
Yashica 3.5/40 enlarging lens at F3.5 on a helicoid and a Canon 5D2 |
|
|
|
|
|
|
|
 |
|
|
|
Photographed with a
Yashica 3.5/40 enlarging lens at F8 on a helicoid and a Canon 5D2 |
|
|
|
|
|
|
|
 |
|
|
|
100% unsharpened crop
at F3.5 |
|
|
|
|
|
|
|
 |
|
|
|
100% unsharpened crop
at F8 |
|
|
References |
|
|
|
|
[tbc] |
To Be Confirmed. The information has not been
confirmed by a credible source. |
|
[pc] |
Photo Cornucopia. Measured or personally observed
by the Author. |
|
|
|
