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04-20-2017, 05:37 PM   #1
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Takumar Tube set

,I just purchased a set of Takumar tubes with case, in mint condition from eBay for about 30 bucks. The reason I purchased these tubes is because I have a Takumar 50mm f4 Macro preset lens. The tubes are labeled #1, #2 and #3. They are not labeled like the more modern tubes, 36mm, 12mm etc. Tube #1 is the shortest and tube #3 is the longest, that's about all I know. My 50mm f4 Macro can extend all the way to 1:1 so I really don't need any tubes except if I wanted to go larger than 1:1. Let's say tube #1 is actually 12mm. What type of magnification can I get if my lens is already set to 1:1 ?

04-20-2017, 05:54 PM   #2
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1:1 + 12/50 = 1.25:1
04-20-2017, 07:08 PM   #3
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Great thanks !
04-20-2017, 07:44 PM - 2 Likes   #4
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You can download the close-up manual from

This gives the sizes of the tubes and the magnification tables for various lenses and combinations of tubes.

Pentax Manuals

04-20-2017, 11:58 PM   #5
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I am about to put up a set of 3 Helicor M42 extension tubes on eBay -- also not labeled but I measured them 11.7 / 16 / 25mm. Also, a Pentax SP w/55mm Takumar lens, and a Super-Takumar 200mm lens will be going up, all excellent.

Last edited by obsolescence; 04-21-2017 at 12:01 AM. Reason: added more
04-21-2017, 03:30 AM   #6
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Not a Number, thanks

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