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06-17-2011, 04:27 PM   #1
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Adaptall needed?

I just purchased a Tamron-F 28mm 1:2.8 for $5. at a garage sale. The mount looks like a pentax k mount but there is a small tab, held on by phillips head screw, that keeps the lens from sitting flush, preventing mounting. The lens does not say adaptall, but I get the impression that is what is required. Can anyone tell me whether I need an adaptall or should I remove the tab preventing mounting? (I would have removed tab already, but even my smallest phillips head is too big)



Tamron-F 28mm F2.8 Lens Reviews - Fixed Focal Lengths - Pentax Third-Party Lens Review Database

06-17-2011, 05:50 PM   #2
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Can you post a pic of the mount?
06-17-2011, 06:34 PM   #3
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The tab I reference in original post is between 3 and 4 o'clock on the outside of the lens (not on mount). Thanks.

Last edited by spanky; 06-17-2011 at 06:37 PM. Reason: clarify
06-17-2011, 06:42 PM   #4
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If the tab comes off the side of the mount at a 90 degree angle don't remove it it should line up with the aperture ring on the lens. When you attach the mount to the lens put the aperture ring on the lens in the largest position i.e. f2.8 and then rotate the tab on the mount to line up with the cutout on the lens and twist the mount onto the lens. There are some other posts on the forum that may explain it a little more clearly but the tab has a purpose in the case of K-mounts and all my adaptall lens are adaptall-2 s so that may be different as well. I'm not sure about other brands of cameras and their respective mounts though.

06-17-2011, 06:46 PM   #5
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after looking at your picture and my lens it doesn't look like the same mount.
06-17-2011, 07:05 PM   #6
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Tamron had more than one interchangeable mount system. In addition to the Adaptall/Adpatall-2, they had the F system and prior to that they had the adaptamatic. That 28 you linked is the F system. That looks like it could be a Minolta MD or MC mount.
06-18-2011, 05:12 AM   #7
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That is a Minolta mount for the old film cameras. It will not work properly on a Pentax DSLR.
06-18-2011, 08:42 AM   #8
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I don't know if Tamron ever made an F-mount for the F series lens, but if they did it would be hard to find. The m42 mount is hard enough. Ironically, I saw the Adaptamatic version of that lens in a thrift shop yesterday with the Pentax II version of the screwmount on it. They had a price of $19.99 on it. I nearly bought just to get the mount. That version supports open aperture metering on the Spot F, ES and ES II bodies with later Adaptamatic lenses. The Adaptamatic 28, F 28 and Adaptall were the same optically.

F version

http://www.adaptall-2.org/brochures/F-System/F-System_page5_300dpi.jpg

http://www.adaptall-2.org/brochures/F-System/F-System_page2_300dpi.jpg

Adaptall Version

http://translate.google.com/translate?hl=en&sl=ja&u=http://www.tamron.co.jp/...-lens/cw28.htm

Adaptall-2 version

http://www.adaptall-2.org/lenses/02B.html


Last edited by Blue; 06-18-2011 at 08:50 AM.
06-18-2011, 08:50 AM   #9
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The mount pictured is Minolta MD.
06-18-2011, 09:41 AM   #10
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06-18-2011, 05:36 PM   #11
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Thank you everyone for the replies.
06-18-2011, 06:18 PM   #12
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What a great wealth of experience is found here!

maybe you can alter the mount to use the lens. I was successful in converting a minolta md to a pentax k by replacing the minolta bayonet with an inexpensive flange type PK-m42 adapter.
06-19-2011, 11:01 AM   #13
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QuoteOriginally posted by newarts Quote
maybe you can alter the mount to use the lens. I was successful in converting a minolta md to a pentax k by replacing the minolta bayonet with an inexpensive flange type PK-m42 adapter.
I have had several fine MC/MD's that I didn't muck with because a relative entrusted me to sell them. But I bought a cheap Kiron-made MD-mount zoom for the purpose of seeing if I could convert MD to PK, so I could buy the Rokkors myself. I found that maintaining aperture control on the test-bed lens just didn't work. Also, the MD register is 2mm shorter than PK, so some metal-shaving would be needed.

I'm sure the Rokkors *could* be converted. I'm just not sure how easily, nor with how much functionality. Yeah, I'd love to put the remaining Tele-Rokkor-PF 100/2.5 on my K20D. But, dare I?
06-19-2011, 11:55 AM   #14
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The F series Tamron lenses have interchangeable mounts. There are m42 mounts available, just hard to find. The adaptamatic mounts are easier to find than the F series.
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