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Farside
Joined: 01 Sep 2007
Posts: 6557
Location: Ireland
Expire: 2013-12-27
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 Posted: Mon Feb 23, 2009 7:09 pm Post subject: Tamron P/KA mount |
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Farside wrote:
I've been scratching my head trying to get the P/KA mount to give me an f-stop reading, because it was behaving just like the ordinary K mount and nothing electrical was happening. I found that if I pressed the lens release button in and rotated the lens backwards by ~2mm it would suddenly work; up flashed an aperture reading and the camera/lens combo worked like it should in all modes. Brilliant stuff.
But 2mm? Fer gawd's sake, 2mm? What kind of so-called tolerances were Tamron working to? I suspect my cam and the mount are at opposite ends of the compatability spectrum, but even so...
Anyway, looks like I'll have to Dremel out the slot slightly and fill in the original side of it with epoxy.
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Nesster
Joined: 24 Apr 2008
Posts: 5883
Location: NJ, USA
Expire: 2014-02-20
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| Posted: Mon Feb 23, 2009 8:10 pm Post subject: |
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Nesster wrote:
before you do that -
are you sure you seat the mount down right, with both feeler ears in slots, the lens in "A" securely etc?
Next, clean the contacts on the mount.
You should not be having this problem, nor should you have to take dremel to it...
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Farside
Joined: 01 Sep 2007
Posts: 6557
Location: Ireland
Expire: 2013-12-27
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| Posted: Mon Feb 23, 2009 10:26 pm Post subject: |
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Farside wrote:
| Nesster wrote: |
before you do that -
are you sure you seat the mount down right, with both feeler ears in slots, the lens in "A" securely etc?
Next, clean the contacts on the mount.
You should not be having this problem, nor should you have to take dremel to it... |
It's doing it with every lens I've tried so far. Possible it's actually the camera mount, but I don't have a P/KA lens to double check it with, just P/K. Like I said, most probably each component is at the opposite end for tolerance (and beyond).
Googling the problem, I find this isn't the only one with this occurance and the remedy is exactly as I thought.
(edit)
Solved it. The black push-button on the bottom allows the extra rotary movement of the aperture ring to the proper AE position. Damnit, now I'll have to Dremel something else, just out of principle. 
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Dave - Moderator
Camera Fiend and Biograph Operator
If I wanted soot and whitewash I'd be a chimney sweep and house painter.
The Lenses of Farside (click)
BUY FRESH FOMAPAN TO HELP KEEP THE FACTORY ALIVE ---
Foma Campaign topic -
http://forum.mflenses.com/foma-campaign-t55443.html
FOMAPAN on forum -
http://www.mflenses.com/fs.php?sw=Fomapan
Webshop Norway
http://www.fomafoto.com/
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Poolhall
Joined: 25 Feb 2008
Posts: 1296
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| Posted: Fri Feb 27, 2009 4:30 pm Post subject: |
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Poolhall wrote:
Smash something with a hammer, its better, |
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ryan s
Joined: 26 Sep 2008
Posts: 384
Location: Madison, WI
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| Posted: Fri Feb 27, 2009 6:34 pm Post subject: |
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ryan s wrote:
Dremel + stone cutoff wheel = a good time 
_________________
Pentax Bodies: K10D + D-BG2 | MX |
M: Zenitar 16/2.8 | 28/2.8 | 50/1.7 | M39: Mir-1 GP 37/2.8 M42: Vivitar 28/2.5 AD2: Tamron SP Macro 90/2.5 |
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Farside
Joined: 01 Sep 2007
Posts: 6557
Location: Ireland
Expire: 2013-12-27
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| Posted: Sat Feb 28, 2009 1:17 am Post subject: |
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Farside wrote:
The P/KA mount is marvellous the way it turns all my Tamrons into trap-focus lenses 
I can see why people chase after them.
_________________
Dave - Moderator
Camera Fiend and Biograph Operator
If I wanted soot and whitewash I'd be a chimney sweep and house painter.
The Lenses of Farside (click)
BUY FRESH FOMAPAN TO HELP KEEP THE FACTORY ALIVE ---
Foma Campaign topic -
http://forum.mflenses.com/foma-campaign-t55443.html
FOMAPAN on forum -
http://www.mflenses.com/fs.php?sw=Fomapan
Webshop Norway
http://www.fomafoto.com/
Webshop Czech
https://fomaobchod.cz/inshop/scripts/shop.aspx?action=DoChangeLanguage&LangID=4 |
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Poolhall
Joined: 25 Feb 2008
Posts: 1296
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| Posted: Sat Feb 28, 2009 9:27 am Post subject: |
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Poolhall wrote:
Not easy to get and usually very expensive, I've given up hope of seeing one at a sensible price, last one was over £100. |
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dnas
Joined: 14 Nov 2008
Posts: 488
Location: Japan
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| Posted: Sat Feb 28, 2009 12:26 pm Post subject: |
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dnas wrote:
I dare say the lens mount has some dirt on the contacts.....
Clean them!! |
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ryan s
Joined: 26 Sep 2008
Posts: 384
Location: Madison, WI
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| Posted: Sat Feb 28, 2009 5:54 pm Post subject: |
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ryan s wrote:
Here's a hint how I got 2 of em, plus a PK for free... (someone on Craigslist sold a camera package worth about $225 for $75, and sold it out from under me  It had a PKA)...
The secret is finding lenses with one attached. I bought the Tam macro locally, mount included. The Tam 28-135 I bought just for the PKA. And I bought a $20 Tam 70-210 non-SP for the PK. Sold that lens for $20 without mount.
In all, I've spent maybe $40 for 2 PKA mounts. Plus I still can sell my Tam 90 for $50, making them free 
_________________
Pentax Bodies: K10D + D-BG2 | MX |
M: Zenitar 16/2.8 | 28/2.8 | 50/1.7 | M39: Mir-1 GP 37/2.8 M42: Vivitar 28/2.5 AD2: Tamron SP Macro 90/2.5 |
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Poolhall
Joined: 25 Feb 2008
Posts: 1296
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| Posted: Sun Mar 01, 2009 8:44 am Post subject: |
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Poolhall wrote:
Yes I have come close with that, but no success, I just use a chinese copy pk/m mount now and its fine in manual and ae on my Samsung, just have to keep looking  |
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jibbonpoint
Joined: 18 May 2008
Posts: 14
Location: Sydney Aust. not far from Jibbonpoint
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| Posted: Mon Mar 09, 2009 1:46 am Post subject: |
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jibbonpoint wrote:
Probably a bit late for a contribution (been away) but my experience is that my PKA mount is very loose on my 19AH & hangs off the camera or lens when disengaging. It is the opposite on my 103A where I have to fight it to get it off the lens. It operates fine with the 46A.
As far as electrical connections go, I have had to clean the contacts to get then to work on any of the lenses.
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Pentax K10D + Kit lens. Tamrons 70-210 19AH, 70-210 46A, 80-210 103A, Tokina SD 70-210,SP 2x tele: Pentax Super Takumar 50 1.4, 135 3.5, F 50 1.7. :Ricoh 35-70 Macro:Soligur 400 6.3: Tamron 500 55BB. Helios 44M-4 58mm 1:2. |
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vverve
Joined: 09 Mar 2009
Posts: 1
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| Posted: Mon Mar 09, 2009 4:51 am Post subject: |
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vverve wrote:
I already have one of the P/KA adapter, but for your infomation here is one on sale:
Click here to see on Ebay
Vern
Last edited by vverve on Mon Mar 09, 2009 5:03 am; edited 1 time in total |
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Attila
Joined: 24 Feb 2007
Posts: 57865
Location: Hungary
Expire: 2025-11-18
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| Posted: Mon Mar 09, 2009 5:02 am Post subject: |
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Attila wrote:
| vverve wrote: |
I already have one of the P/KA adapter, but for your infomation here is one on sale:
Click here to see on Ebay
Vern |
Welcome Vern!
Many thanks for sharing this rare opportunity!
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