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09-23-2011, 12:00 PM   #1
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does the DA*60-250 work with a TC?

does the DA*60-250 work with a TC? if so which one and where can I get it?

09-23-2011, 12:06 PM   #2
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I am after a really good long range lens but I don't want to have a fixed focal length so I was looking at a telephoto zoom with a TC attached I looked at the sigma 2.8 70-200 but the sigma TC doesn't work with the Pentax version apparently so I was thinking of the DA*60-250 with a TC but I am not aware of a TC that works with it either, my other option is the bigma, or a 150-500 with a TC on that but I am worried about the clarity and sharpness at the longest ranges I would be using the telephoto for mainly hobbyist work but I do like to please myself and have good clear sharp images, so not going with a prime what would people recomend?
09-23-2011, 12:17 PM   #3
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You can also try to find a used Sigma 100-300 which works very well with Sigma's TCs. This lens has excellent IQ, much better than you would expect from the price (IMO). I think there may be one for sale in the marketplace now.
09-23-2011, 12:30 PM   #4
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60-250mm works with the Tamron 1.4x MC4, Kenko 1.5X SHQ and Promaster 1.7X SHQ

09-23-2011, 12:48 PM   #5
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The only TC that works reliably with the DA*60-250 is the Pentax 1.7X AFA. Of course then the autofocus is done by the AFA, not by the DA*60-250.

With the Tamron 1.4X (I have 2 copies), the DA*60-250 does not focus reliably at the long end (there's no reason to use a TC at the short end). It hunts back and forth a lot. If I remove the half press of the shutter release, then half press again, it may focus on something contrasty. I missed many photos because of this and stopped using the Tamron when I acquired the Pentax 1.7X AFA.

All the DA* zoom lenses I have behave the same way with TC.
09-23-2011, 12:55 PM   #6
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QuoteOriginally posted by SOldBear Quote
The only TC that works reliably with the DA*60-250 is the Pentax 1.7X AFA. Of course then the autofocus is done by the AFA, not by the DA*60-250.

With the Tamron 1.4X (I have 2 copies), the DA*60-250 does not focus reliably at the long end (there's no reason to use a TC at the short end). It hunts back and forth a lot. If I remove the half press of the shutter release, then half press again, it may focus on something contrasty. I missed many photos because of this and stopped using the Tamron when I acquired the Pentax 1.7X AFA.

All the DA* zoom lenses I have behave the same way with TC.
This is my experience as well. While the Tamron 1.4x will allow you to focus with the SDM motor on a DA* lens, it is less than reliable and often takes a second (or third) try to focus. It's certainly not a combo I would use for fast moving action shots. The Pentax 1.7x AF-A works very well, just keep in mind you have to pre-focus manually depending on the range of distances you are trying to focus over.
09-23-2011, 01:20 PM   #7
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Does that have anything to do with the electric contacts on Tamron TC?

My copy of Tamron 1.4X TC is apparently different from the one reviewed on this site. My copy has 7 contacts on both sides plus 2 additional contacts for PZ (SDM now). The pictures on the review section show 6 contacts on back side of TC. I used my TC with 50-135mm and SDM worked fine. I may try more test later.
09-23-2011, 01:39 PM   #8
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QuoteOriginally posted by hyyz Quote
Does that have anything to do with the electric contacts on Tamron TC?

My copy of Tamron 1.4X TC is apparently different from the one reviewed on this site. My copy has 7 contacts on both sides plus 2 additional contacts for PZ (SDM now). The pictures on the review section show 6 contacts on back side of TC. I used my TC with 50-135mm and SDM worked fine. I may try more test later.
It's not that the SDM doesn't work, it's just that there's a fairly substantial reduction in AF performance. For still targets it's not really an issue. For moving targets, it poses more of a problem.

09-23-2011, 02:51 PM   #9
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QuoteOriginally posted by hyyz Quote
Does that have anything to do with the electric contacts on Tamron TC?
As dgaies stated, no, it doesn't.

Without the two "power zoom" contacts, there would be no autofocus at all.

BTW, I also have a Tamron 2X TC. It does have 7 contacts + 2 "power zoom" contacts. When used with DA* zoom lenses, there is no autofocus whatsoever.

QuoteOriginally posted by hyyz Quote
I used my TC with 50-135mm and SDM worked fine. I may try more test later.
Please try it with the lens at 135mm and report back.
09-23-2011, 03:16 PM   #10
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QuoteOriginally posted by SOldBear Quote
BTW, I also have a Tamron 2X TC. It does have 7 contacts + 2 "power zoom" contacts. When used with DA* zoom lenses, there is no autofocus whatsoever.
The odd part is, the SDM of the DA17-70 actually works with the 2X Pz-AF. I have no idea why it works with that particular lens but none of the other DA* lenses (not that it would ever be advantageous to use a 2X with the 17-70).

I've since removed the glass from all my 2X TCs and use them as extension tubes. Ironically, with my DA*55, the SDM actually works pretty well using the ext tube w/ Pz-AF contacts (link)
09-23-2011, 07:43 PM   #11
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ok thanks for everyones insight I will use it towards my next lense from BH
09-25-2011, 09:30 AM   #12
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My two cents

QuoteOriginally posted by beales1986 Quote
ok thanks for everyones insight I will use it towards my next lense from BH
I thought I'd add my own experience to this discussion as I have the DA* 60-250 as well as the AFA 1.7x and a 1.4x PZ AF teleconverter (it's "Pro Cambron" which appears to be a Tamron clone since it looks identical to the pictures of the latter).

I have no problems autofocusing (SDM) with the 1.4x TC although it is definitely not as fast as with the lens alone. For my test (which I just performed indoors), I left the camera on AF-C and auto-select for focus point. It hunted a bit in low light but no problems locking focus.

As others have mentioned already, the AFA 1.7x works well also, but this is screw-driven rather than SDM.

Hope this helps.

--KYC
09-26-2011, 07:34 AM   #13
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thanks
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