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03-10-2014, 07:16 PM   #1
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Posts: 46
Help with t-Mount

I just bought a Spiratone 105mm f2.5 lens and was advertized as M42 mount. I received the lens and tried to mount it on my K-50 w/ Genuine Pentax M42 adapter.

I am at wits end here and can anyone identify the mount I got? and if no-go the T-mount I need to get.

Any help appreciated and I have attached 2 pics of the mount I received and 1 pic of a mount on on same type of lens which is currently on ebay

My Lens 1 Img Test Tmounta | Flickr - Photo Sharing!

My Lens 2 Img Test Tmount-3a | Flickr - Photo Sharing!

Same lens currently on ebay which I believe has the correct T-Mount to M42 Spiratone 105-4 | Flickr - Photo Sharing!

Thanks guys in advance

Gavin McKinlay

03-10-2014, 08:02 PM   #2
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Join Date: Aug 2012
Location: North Carolina
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Well, clearly it's not M42. If the bayonet doesn't fit your K-50, then it's not K-mount either (make sure the notch for the locking pin is at the 6 o'clock position when you try to insert the bayonet). Could be Nikon or something else. The T-to-K-mount adapter I use on my 105/2.5 is the Sonia:

New T Mount Adapter for Pentax K Metal MX K1000 | eBay

It's inexpensive and somewhat smaller in outer diameter, and doesn't look like a doughnut on the end of the 105/2.5.
03-10-2014, 09:38 PM   #3
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Join Date: Dec 2013
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Original Poster
Thanks a bunch for that info. I think it is a Pentax mount but won't lock in. I think I would do better with the Sonia.
03-10-2014, 09:47 PM   #4
Not a Number's Avatar

Join Date: Mar 2012
Location: Venice, CA
Posts: 4,260
I learned my lesson and only buy T-mount adapters made in Japan. This is the one I have:
Qualide T Mount Lens Adapter for Pentax K 35mm SLR Film Camera 25 166 2227 | eBay


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