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04-01-2009, 05:58 PM   #1
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Tamron 28mm f2.5 BBAR MC adaptall 2

Hi all,

I have aquired this lens to use with my K200D hoping that it would work in M & AV mode since the adapter is of the P/K type.

In M mode it operate normaly, both ring (focus & fstop) work smoothly.

In AV mode it is always at f2.5, ei. the lever inside the camera does not operate the lever on the lens to reduce the opening.

I operated the lens lever and it works perfectly.

So the question is: is it normal for this type of P/K mount to do this.

Pierre

04-01-2009, 06:09 PM - 1 Like   #2
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I have this lens as well - it's a little strange in that you have to set the aperture ring to f/32 in order to use it in Av mode.

Also, my Adaptall 2 adapter says P/K-A, not just P/K. Without the "A", you'll only get stop-down metering.
04-01-2009, 06:21 PM   #3
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Tamron 28mm f2.5 BBAR MC adaptall 2

Hi OregonJim,

Well the saleman got me again

It was not a big investment $30 (+/- US$24) & I have a good manual lens.

Thanks
04-01-2009, 06:26 PM   #4
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Well, it's a nice lens. All you need is the right adapter. I bought my 28/2.5 new back in 1986 or so for something like $150...

04-01-2009, 06:37 PM   #5
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I thought I had a bargain, since it had a lever on the lens to operate the diaphragm, I assumed that the lever had a purpose.

I have been in photography since 1957 (on and off) and I have never seen something on a photo equipment that had no purpose.
04-01-2009, 07:00 PM   #6
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Well, it does have a purpose. It's meant to mate with an adapter that supports the lever. Unfortunately, not all of the adapters do...

FWIW, you can sometimes find the P/K-A adapter on eBay for around $20 or so...
04-01-2009, 07:09 PM   #7
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Yes I have seen 2, but they are at 110.00 and 40.00 US$.

Well as I have said: I have a great manual lens.

It is much less work than the Nikon-Q 135mm f3.5 with a 3X converter that I have to convert to K mount
04-01-2009, 10:10 PM   #8
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QuoteOriginally posted by pdophoto Quote
I thought I had a bargain, since it had a lever on the lens to operate the diaphragm, I assumed that the lever had a purpose.

I have been in photography since 1957 (on and off) and I have never seen something on a photo equipment that had no purpose.
Ummm...the lever on the P/K mount does have a purpose. It operates the iris diaphragm.

The problem is that the mount on your Pentax dSLR lacks the full coupling mechanism to allow for AV exposure automation. Because of this your K200D is programmed to not operate the aperture stop-down lever. If you shoot in M mode, the lever works just fine.

I have two Adaptall-2 lenses (28/2.5 and 70-150/3.5) and own both the PK and PK/A adapters. Both work just fine. With the PK adapter the lenses behave as Pentax-K or Pentax-M. With the PK/A, they behave as a Pentax-A. On my older Ricoh 35mm SLRs both adapters allow for AV automation and manual metering.

Steve


Last edited by stevebrot; 04-01-2009 at 10:15 PM.
04-02-2009, 06:05 AM   #9
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Hi Steve,

thank you for the explanation.

I did not realise that the sound that I eared when I pushed the green button was actually the operation of the said lever.

After all it was not a bad deal and will not have to buy another lens.

Thank you again

Pierre
04-02-2009, 02:52 PM   #10
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Thanks, Steve. You did a better job of saying what I was trying to say...
04-02-2009, 03:55 PM   #11
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QuoteOriginally posted by pdophoto Quote
Hi Steve,

thank you for the explanation.

I did not realise that the sound that I eared when I pushed the green button was actually the operation of the said lever.

After all it was not a bad deal and will not have to buy another lens.

Thank you again

Pierre
My pleasure! I hope you enjoy your Tammy. It is a good lens, though somewhat better on 35mm film than on digital.

Steve
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