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01-06-2017, 10:54 PM - 6 Likes   #1
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The 500/5 takumar

As per a request in another thread here are some photos of my 500 f5 Takumars starting with the Asahiflex (M37) version. AFAIK these are all the same optically, a simple two element design, but the position of the aperture is different in the later versions as you will see. I believe there may be an M42 version of this lens as well, but as printed sources like catalogs can be unreliable I'll wait until one turns up in the flesh before calling it confirmed. In the book by Danilo Cecchi you can see two catalogs, one from the 50s showing the later version and one from the 60s with the earlier version.



The chrome look was big in the fifties :-)







I don't know why there is a breech-mount connector for the lens mount, unless they were planning on selling the lens in other mounts too. The 500/4.5 and 1000/8 also have them.



Minimum aperture of f16, as opposed to f22 on the later versions, and no click stops either.









The same cap was used for all versions of the 500/5 as far as I can tell.

---------- Post added 01-07-2017 at 04:58 PM ----------

A couple of comparison shots with the two later versions



At the back is the early version of the M42 lens, as you would expect they are all about the same length



At the mount end showing the different position of the lens mount attachment, focus wheel and distance scale

---------- Post added 01-07-2017 at 05:15 PM ----------

The major difference between the two M42 versions is the tripod mount


(early version at the front)


(early version on the left)

The lettering around the lens trim ring is different, as is the distance scales. The early version will rack out to 30 feet as opposed 35 feet on the later version.


(early version on the left)


(early version on the left)


The early version has white lettering only and doesn't mark the half stops, nor is there a click stop for them.


On the later version there is the usual Pentax cream and pale blue lettering for meters and feet along with an IR mark, and the half stops are marked and have click stops.

01-06-2017, 11:25 PM   #2
pjv
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WOW !! The workmanship in these old beauties is wonderful Paul. Thanks for posting them mate.

---------- Post added 07-01-17 at 05:39 PM ----------

I just checked eBay and saw this !!!


Pentax M42 Asahi 500mm f5 TAKUMAR Lens Rare Rare | eBay
01-07-2017, 07:15 AM   #3
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Excellent write up. Lovely lenses.
01-07-2017, 08:28 AM   #4
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Wow! Indeed very beautiful lenses! Thanks for this thread; as I've not been aware of these before.

01-08-2017, 08:29 AM   #5
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Thanks for posting. Really interesting information and exceptional well coverage.
02-09-2017, 02:44 PM   #6
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Great stuff. Many thanks for posting these. K.
02-19-2017, 12:10 PM   #7
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Not sure how old the original post is for this thread, but I'll make an observation and guess about that breech mount. I had a 1000mm f11 reflex Takumar (or Pentax, forget the official designation) in K-mount that also a a rear breech mount that could be used to remove the K-mount module. Asahi had and still does make spotting scopes and telescopes (primarily refractors for astronomy) with interchangeable prisms and eyepieces (Pentax astronomy eyepieces have a reasonably good reputation, but not like Tele Vue). I wondered whether breech mount allowed conversion of the 1000mm reflex to a telescope by attaching a 90 degree prism star diagonal or an Amici erecting prism, and I wonder if that is also the purpose of the breech-mount on the 500 f5 and f4.5 as well as the 1000mm f8.

Last edited by WPRESTO; 02-19-2017 at 12:18 PM.
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