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10-03-2014, 02:42 PM   #1
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Need help with a Tamron 28mm f/2.8 Adaptall CW-28

Hi everyone, I'm new here and I've come in need of your expert advice. I just bought an old Tamron 28mm lens on ebay, that I believe to be an Adaptall (version 1) with an adapter already on it. I bought this lens for my K-r, but I cannot get it to work. It fits, but I turn my camera on and nothing. I have read thread after thread trying to figure out which lens I actually purchased and what adapter I might need and I think I am even more confused than I was before. Is there anyone that could shed some light on this lens and its existing adapter?


10-03-2014, 02:51 PM - 1 Like   #2
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Assuming the lens mounts properly and the adapter isn't shorting the contacts (i.e. the camera menus work and nothing erratic happens), follow this guide:

https://www.pentaxforums.com/forums/54-pentax-lens-articles/110657-how-use-me...k-x-k-7-a.html

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10-03-2014, 03:31 PM - 1 Like   #3
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Lens should work like Pentax K or M lens with that mount. Check your set up (aperture ring etc).

More info:
Information page on Tamron adaptall, adaptall-2 system and lenses
10-03-2014, 04:03 PM - 1 Like   #4
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The lens looks like it has an aperture control switch, probably to make it compatible with an M42 adapter and M42 cameras. That switch is visible in your photo of the side of the lens. You could try to slide the switch in either position. I'm not sure which one would work; it depends on how the adapter was designed.

10-03-2014, 04:52 PM - 1 Like   #5
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The lens is not an adaptall-2 type. It's a adaptall lens from 1976.
Be sure the adapter tabs are in the proper slots on the lens body.
10-04-2014, 05:18 AM - 1 Like   #6
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Dump it....

From Marcus link....

"A first generation manual P-KM mount, easily distinguished from the later mount by the lack of a black flange with f numbers on, and only one tab. This is probably best avoided except to use specifically with certain early adaptall lenses" - See more at: Information page on Tamron adaptall, adaptall-2 system and lenses
10-04-2014, 05:53 AM - 1 Like   #7
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QuoteOriginally posted by Oldbayrunner Quote
Dump it....

From Marcus link....

"A first generation manual P-KM mount, easily distinguished from the later mount by the lack of a black flange with f numbers on, and only one tab. This is probably best avoided except to use specifically with certain early adaptall lenses" - See more at: Information page on Tamron adaptall, adaptall-2 system and lenses
Yes you're right that is the 1st gen mount. But I should actually test the functioning of the darn thing since I have one and make a clearly definitive statement on my web page.
In any event the OP CAN use the mount, operating in Av, using the A-M switch to stop down manually. Which is what I tend to do with these AD-1 lenses in any case it's one of their advantages.

Try it out Jessamyn, set mode dial on AV, focus switch on MF, make sure you've set "use aperture ring" in the settings etc. Put the A-M switch on A - aperture will be wide open and will stay wide open when you click the aperture ring round to eg f5.6, f8 (whatever you want). Focus and frame. Then just before pressing the shutter, flick the A-M switch to M. You will see the viewfinder go dim because the iris closes. Press the shutter.

Addendum: you will almost certainly need to use the exposure compensation function (the wee button with +/- on it). Typically I am compensating up to around +1eV to get the exposure right.

Last edited by marcusBMG; 10-04-2014 at 09:41 AM.
10-04-2014, 09:04 AM - 1 Like   #8
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QuoteOriginally posted by Oldbayrunner Quote
Dump it....

From Marcus link....
QuoteOriginally posted by marcusBMG Quote
Yes you're right that is the 1st gen mount.
...and it is also mounted on a first generation lens and should function the same as any other K or M series K-mount lens*. Marcus' solution using the A/M switch in Av mode is unique and worth trying out.


Steve

* The second tab on the Adaptall-2 Pentax K,M adapter serves no purpose other than to locate and drive the second aperture scale used for viewfinder display on supporting cameras.

10-04-2014, 09:41 AM - 1 Like   #9
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QuoteOriginally posted by stevebrot Quote
The second tab on the Adaptall-2 Pentax K,M adapter serves no purpose other than to locate and drive the second aperture scale used for viewfinder display on supporting cameras.
I hadn't appreciated that - cheers Steve
I had in fact just yesterday updated the description in the review secion for the PKA

Last edited by marcusBMG; 10-04-2014 at 09:57 AM.
10-04-2014, 04:42 PM   #10
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Thank you so much for your replies! I'm going to try changing the various settings as suggested. I will report back if I had any success or possibly just $20 down the drain.
10-04-2014, 04:48 PM   #11
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QuoteOriginally posted by marcusBMG Quote
make sure you've set "use aperture ring" in the settings etc.
That did it! Lens fully functioning now, thank you Marcus and everyone for your help.
10-05-2014, 05:23 AM   #12
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Thats great jessamyn, enjoy the lens. I don't have one in my adaptall collection, only the later 01B, but going by the reviews there's little between them and I rate the 01B. Get some good pics and post them in the adaptall lens club thread.
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