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Old Mar 18, 2010, 8:17 PM   #1
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Default help with lens mount

alright

picked this lens up on the bay for next to nothing

it was showing it as a pentax K mount but tahts not the case

smc takamur ashai pentax 1:1.8 55mm

its a nice little lens but its gotta weird mount on it. tried lookin up some of bigdawg's resources on lens mounts but still couldnt find it..

Its gott weird screw threads around the lens so that it perfectly screws into a 2X teleconverter that i have for my K mount but its the only way to put it on. I do like how i can get twice as close to things with the teleconverter, it makes this a pretty nice up close macro lens but not really what i wanted it for.

I rather like using it with the teleconverter but I was wondering what mount this is? if i use an adapter will it alter any of the lens's specs? if so how does it change this..

Im not sure if i should go shell out for an adapter or just sell it back to ebay

it seems to be a pretty sharp lens


anyways here it is:

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Old Mar 18, 2010, 8:18 PM   #2
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oops. im sure you remember but just incase im sportin the k20d
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Old Mar 18, 2010, 10:32 PM   #3
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Sounds like it's an M42 screw-mount, not a K-mount. I don't own any but hopefully some of the people who do will drop by and confirm that. If so, you can get an adaptor to make it work on the K20 - it'll be completely manual.
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Old Mar 18, 2010, 10:46 PM   #4
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thanks mtngal! Yes screw mount sounds about right, going by the threads.

will this change the focal point by adding an adapter?
sorry for the noob questions
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Old Mar 19, 2010, 2:33 AM   #5
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That is definitely an M42 thread. You'll want to get a screw mount adapter to use that lens directly on the body. Your 2X teleconverter will definitely change your focal point. You will lose the ability to focus to infinity if you use the teleconverter; with a screw mount adapter, you will be able to use the full focal range of the lens.

- Jason
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Old Mar 19, 2010, 7:54 AM   #6
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Looks like a M42 screw mount to me. The adapter for that would not change the way it shoots. You should be able to focus to infinity. Here is a pretty good one for not a lot of money....http://www.bhphotovideo.com/c/produc...Universal.html

Stay away from the adapters with the wide flange on them..such as is sold on Ebay.
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Old Mar 19, 2010, 6:58 PM   #7
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I have the exact same lens on my Spotmatic II that I purchased in 1970. To use the lens, you need a M42 to K converter as Dawg has pointed out. Its a wonderful lens. Enjoy!!!
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Old Mar 19, 2010, 7:07 PM   #8
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I have a 55mm f/1.8 Takumar lens and it is very good.
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