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Old Aug 23, 2006, 6:33 PM   #11
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I use the proper Pentax metal adaptor.

It fits the bodies properly (obviously) and therefore allows focussing to infinity, somenthing other third party adaptors do not always do. I bought mine on Ebay.

I has the k mount fitting on one side that goes into the camera body and the lens then screws into the adaptor.

I screw the adaptor onto a lens and then mont the lens onto the camera. To change lenses I simply unscrew the lens and replace with another screw mount with the adaptor still mounted in teh camera.

If you only use screw mount lenses in a particular session lens changing is very quick. It does take about an extra 10 seconds or so to change from screw mount to bayonet lens as you have to unscrew the lens and then remove the adaptor separately.

My longer screw mounts are heavy and it is not a problem with weight on the camera, although I do use a monopod when using these lenses.

I use them on both my Pentax slr's MZ50 and *istDS.


The only drawbacks are that you have to manually focus and use either manual or apetture priority metering with the lens apeture stopped down. This means that you focus with the lens wide open then close th apeture down to the required opening for metering.

Phil


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Old Aug 24, 2006, 3:24 AM   #12
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I have the Tamron 80-250 f/3.8 M42 screwmount. Mine has a little bit of dust and I paid $40Aus, which I considered quite cheap. Yes it is a HEAVY lens, soft when Wide Open, but okay when stopped down a notch.
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Old Aug 24, 2006, 4:18 AM   #13
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Regarding the Pentax mount adapter, I have one on a Takumar 1:4 / 300, this lens is pride of my collection but it has a screw mount. The Pentax mount adapter works well but it can be a nuisance in that there may be nothing for the bayonet lock pin to engage with. This means you could be carrying your camera and have the lens drop off! I permanently mounted the adapter on the lens after removing the spring that locks the adapter to the camera. Then I fitted a ring to the lens and drilled a hole in it to accept the camera locking pin.

The Pentax screw mount was I understand an industry standard in its time. The Tamron adapters has the same diameter but different pitch thread! Whatever you do do not try to force them together!
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Old Aug 24, 2006, 5:15 AM   #14
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John

I think you are confusing the T mount with the M42. Correct they are the same size 42mm, but different thread pitch. The Tamron 80-250 f/3.8 is a M42 mount not T mount. It should say "for Pentax II" on the collar near the thread.

Crash
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Old Aug 24, 2006, 2:55 PM   #15
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Thanks John, Phil, and Crash. You have answered a lot of my questions. Crashman, it does not sound like this lens is one of your favorites or a life changing experience or anything. I am very grateful for that information as it was the lens that intrigued me most. From watching ebay it looks like I can get a wide angle prime in 28mm for less than $50.00. I think I will take my camera in and mount that 500mm and see how well it actually works, it might be handy when the Swedish Bikini Volleyball Team shows up across the lake at their winter training camp.

Thanks again,

Tim
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Old Aug 24, 2006, 3:16 PM   #16
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Crashman wrote:
Quote:
John

I think you are confusing the T mount with the M42. Correct they are the same size 42mm, but different thread pitch. The Tamron 80-250 f/3.8 is a M42 mount not T mount. It should say "for Pentax II" on the collar near the thread.

Crash

At 42mm do you have any idea what the thread pitch is for the T-mount or the series 7???? I'm presuming the pitch for the 42 would be National Fine.

Quote:
I permanently mounted the adapter on the lens after removing the spring that locks the adapter to the camera. Then I fitted a ring to the lens and drilled a hole in it to accept the camera locking pin.
John, how did you mount permanently - light weld or maybe locktite?

I have a metal adapter and it's quite tight on the K side and sometimes difficult to take off.
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Old Aug 24, 2006, 3:20 PM   #17
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Crashman wrote:
Quote:
John

I think you are confusing the T mount with the M42. Correct they are the same size 42mm, but different thread pitch. The Tamron 80-250 f/3.8 is a M42 mount not T mount. It should say "for Pentax II" on the collar near the thread.

Crash
As Crash pointed out the T mount requires an adaptor (I have K-mount, Canon MF mount, Miranda bayonetand Minolta Maxxum here, don't even bother to ask). Even if you could get it to screw in it would have severe focus issues because it was intended to be on an adaptor that is at least 7 or 8mm thick.

Ira
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