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10-14-2020, 08:35 AM   #1
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Missing stats on aperture blade count and dimensions for M37 Lenses

Hey all,

Does anyone know where I can confirm the dimensions (diameter x length) and aperture blade counts for the following Asahi Takumar lenses made for the M37 mount? I'm working on filling in gaps in the data collection for my Aperturepedia project.

- 50mm f3.5 ("CSS" here on PentaxForums reported 1.5" length (including the mount) by 1.8" diameter but I'd like to confirm this. I also wanted to confirm that the preset and manual variants of the 50mm f3.5 M37 both had 12 blade apertures and identical dimensions.)

- 58mm f2.4 (I see 13 blades reported here, but 12 at http://m42lens.com/m42-lens-database/1408-asahi-kogaku-takumar-58mm-f-2-4-22)

- 83mm f1.9 (http://m42lens.com/m42-lens-database/754-asahi-kogaku-takumar-83mm-f-1-9-16-m37 reports 20 blades but would like to confirm given above discrepancy)

- 100mm f3.5

- 135mm f3.5 (http://m42lens.com/m42-lens-database/1407-asahi-kogaku-tele-takumar-135mm-f-3-5-22 reports 16 blades but would like to confirm given above discrepancy)

- 500mm f5

Thanks!
Nick

10-14-2020, 08:18 PM - 1 Like   #2
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QuoteOriginally posted by nklein Quote
. . .
- 135mm f3.5 (Asahi-Kogaku Tele-Takumar 135mm f/3.5-16 - M42 Lens Database reports 16 blades but would like to confirm given above discrepancy)
. . .

Yay! Some love for the neglected M37s!
And thanks for your work on Aperturepedia, Nick!

Without caps and focused to infinity, my 135mm f/3.5 #94909 is almost exactly 50 mm wide, just a hair more than 90 mm long and it has 16 aperture blades.

Huh... Until took this photo, I never knew the 135's blades had that hooked contour.


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Tim
10-15-2020, 09:19 AM   #3
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QuoteOriginally posted by .a.t. Quote
Yay! Some love for the neglected M37s!
And thanks for your work on Aperturepedia, Nick!

Without caps and focused to infinity, my 135mm f/3.5 #94909 is almost exactly 50 mm wide, just a hair more than 90 mm long and it has 16 aperture blades.

Huh... Until took this photo, I never knew the 135's blades had that hooked contour.


Attachment 511307

Tim
Excellent, thanks Tim! Let me know by which name you'd like me to credit you in the "Notes" section for that lens.
10-15-2020, 12:24 PM - 1 Like   #4
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QuoteOriginally posted by nklein Quote
Excellent, thanks Tim! Let me know by which name you'd like me to credit you in the "Notes" section for that lens.

You're welcome, Nick. I'd prefer to be anonymous, so you can list me as a friend of the site, anon. or whatever you choose.

10-17-2020, 02:09 PM - 1 Like   #5
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The 100mm is 254 gr.

82mm long, and 44mm wide, that is the ring against the camera body. The focus ring is 42mm.
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10-17-2020, 02:17 PM - 1 Like   #6
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The 58 mm is 231 gr, 42mm long and 47mm wide. I also have one copy that is 48mm wide.
I can count 12 blades.
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10-17-2020, 02:30 PM - 1 Like   #7
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The 50mm came in 3 versions.

Version 1 is 141gr, 23mm long and 43mm wide.

I count 12 blades.
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10-17-2020, 02:33 PM - 1 Like   #8
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The 50mm came in 3 version.

Version 2 is 161 gr, 26mm long and 47mm wide. 12 blades.

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10-17-2020, 02:36 PM - 1 Like   #9
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The 50mm came in three versions.

version 3 is 159gr, 26mm long and 46mm wide. 12 blades.
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10-20-2020, 07:32 AM   #10
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QuoteOriginally posted by Baard-Einar Quote
The 100mm is 254 gr.

82mm long, and 44mm wide, that is the ring against the camera body. The focus ring is 42mm.
This is extremely helpful, thank you so much Baard-Einar! Let me know if/how you'd like to be credited on the site!
10-21-2020, 07:18 AM - 1 Like   #11
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QuoteOriginally posted by nklein Quote
This is extremely helpful, thank you so much Baard-Einar! Let me know if/how you'd like to be credited on the site!
You may credit me if you wish. Use my full name: Baard-Einar Moe

/Baard-Einar.
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