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03-03-2013, 08:41 PM   #1
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What mount is this?

A friend has asked me to sell a 135mm f2.8 Soligor prime lens that he used previously with his 35mm Pentax SLR (model unknown)

The lens fits on my K-5 but there is no mechanical aperture interconnection. Is this the most basic original K mount or something else? I just want to describe it correctly when it is put it up for sale

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03-03-2013, 08:49 PM   #2
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It looks to be a K-mount, but I suspect that it has a preset aperture mechanism (a non-auto lens in the older sense of the term). In which case there should be an aperture ring and also a second stop-down ring or switch. This type of arrangement used to be fairly common. Do you have other pictures of the lens?


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03-03-2013, 08:59 PM   #3
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I'm betting it is an interchangeable mount lens, called a T mount and it appears to have a K mount adapter on it.
03-03-2013, 09:11 PM   #4
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QuoteOriginally posted by stevebrot Quote
It looks to be a K-mount, but I suspect that it has a preset aperture mechanism (a non-auto lens in the older sense of the term). In which case there should be an aperture ring and also a second stop-down ring or switch. This type of arrangement used to be fairly common. Do you have other pictures of the lens?
Steve
Additional photos of the lens are shown below. There is a second stop down ring that operates between the set f stop and full aperture - I assume so you could use full aperture for focussing (?) then I assume you had to remember to shift it back again before you took the photo (?)

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03-03-2013, 09:14 PM   #5
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QuoteOriginally posted by elliott Quote
I'm betting it is an interchangeable mount lens, called a T mount and it appears to have a K mount adapter on it.
Can you tell from the above photos if there is an adaptor on the lens? Nothing seems easily removable to me... there is a knurled ring at the base of the lens that is locked in place with 3 grub screws...
03-03-2013, 09:15 PM   #6
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Well, there you have it. The lens is T-mount (will accept many different adapters for different cameras) and it does have a pre-set aperture mechanism. The aperture is used in the manner you described. For a description of how the mount works, see:

http://en.wikipedia.org/wiki/T-mount


Steve
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