| Topic: |
Komuranon-S Enlarging Lenses |
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Author/Copyright:
|
John Jovic
|
Komuranon enlarger or enlarging lenses were
made by Komura Lens MFG. LTD. and sold in various parts of the world
during the 70's. They were sold as
Komuranon-E and later as Komuranon-S
enlarging lenses. The Komuranon-E line of
lenses included the 3.5/50, 5.6/75, 5.6/90, 5.6/105, 5.6/135 and 5.6/150mm lenses
however the Komuranon-S line of
lenses which followed may not have included all of the lenses of the Komuranon-E. The Komuranon-S 3.5/50 and
5.6/75 were commonly sold and are
readily available on the used market today. The Komuranon-S 5.6/105[1]
and 5.6/150[2] lenses were made and sold however they are much less
common then either the Komuranon-S 3.5/50 or 5.6/75.
The advertising clipping[3] below describes the Komuranon-S lenses main
features and specifications but it does not state how they differed to
the earlier Komuranon-E lenses of the same focal length. The
Komuranon-E
5.6/75 and 3.5/50 had the same lens construction of 6 elements in 4 groups
and the exact same weight as the Komuranon-S 5.6/75 and 3.5/50 so it is possible that Komuranon-E and Komuranon-S lenses
are either exactly the same or possibly updated with minor and possibly
inconsequential changes, but this is only speculation
until there is evidence to suggest otherwise.
According to the advertising clipping[3] below;
'The Komuranon Series "S" Enlarging Lenses go beyond the design
standards of most enlarging lenses. The Komuranon "S" formula corrects
aberrations that occur in the visible light spectrum and uniquely cuts
off infrared and ultra violet rays - the invisible part of the spectrum
- to which the paper is sensitive. This results in superior contrast,
resolution and color saturation.'
 |
|
The above advertising
clipping[3] was kindly supplied by chip j from the Analog Photography
Users Group forum (APUG). |
Specifications
The Komuranon-S lenses specifications have been transcribed into the
table below. Note that above advertising clipping[3] states that 'All
lenses are four layer coated'.
| |
3.5/50mm
"S" |
5.6/75mm
"S" |
5.6/105mm
"S" |
5.6/150mm
"S"[2] |
| Focal Length (mm): |
50 |
75 |
|
150 |
| Maximum aperture (F): |
3.5 |
5.6 |
|
5.6 |
| Lens construction (elements - groups): |
6-4 |
6-4 |
|
|
| Angle of coverage: |
56 |
56 |
|
|
| Recommended negative size (mm): |
24 x 36 |
60 x 60 |
|
|
| Minimum aperture (F): |
22 |
22 |
|
22 |
| Designed magnification: |
|
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| Useful magnification range: |
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| Achromatized wavelength range (nm): |
|
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| Distortion at basic magnification (%): |
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| Focal length design value (mm): |
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| Barrel outer diameter A (front) (mm): |
|
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Flange mount thread size: |
Leica |
Leica |
|
Leica |
|
Filter size (mm) |
|
M40.5x0.5[pc] |
|
None |
| Barrel outer diameter B (rear) (mm): |
|
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|
| flange focal length (mm): |
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| Back focal length (mm): |
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| Distance from flange surface to the
second principal point (mm): |
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| Principal point spacing (mm): |
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| Total length (mm): |
41.3 |
37.5 |
|
|
| Weight (g): |
112 |
93 |
|
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| Coating: |
four layer coated |
four layer coated |
|
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References |
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|
|
[tbc] |
To Be Confirmed. The information has not been
confirmed by a credible source. |
|
[pc] |
Photo Cornucopia. Measured or personally observed
by the Author. |
|
[1] |
Sighted for sale on Ebay late 2014 |
|
[2] |
"Komuranon-S
5.6/150 Enlarging Lens".
http://photocornucopia.com, accessed
March 3, 2015.
http://photocornucopia.com/1065.html |
|
[3] |
Hindaphoto Inc. Komura Facts. USA. nd |