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11-17-2009, 04:39 PM   #1
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Anyone tried the Sigam 70-200 HSM and Tamron 1.4x combo?

I have the Tamron-F 1.4X Pz-AF MC4 TC that supposedly supports SDM?HSM. I'm sort of maybe thinking of getting the Sigma 70-200/2.8 HSM. Unfortunately here there is absolutely no way of testing the combination before purchase. Probably could if I was a Canon or Nikon user

So has anyone tried them together? Does it work? Any speed or AF compromises as a result?

11-18-2009, 01:02 AM   #2
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I'm not really sure why you would want to do that. The Sigma F2.8 70-200 HSM is not really well known for its image quality in comparison to tammy of the same spec. Moreover, the Sigma F4 100-300mm is known for fast focus and amazing sharpness. So that would be far better than the 70-200 plus TC.

You should try to figure out if you are going to the use the Sigma F2.8 70-200 primarily in its native focal lengths in the 2.8-4 aperature range a lot because otherwise I would just go with the Sigma F4 100-300mm.
11-18-2009, 04:41 PM   #3
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QuoteOriginally posted by vandamro Quote
I'm not really sure why you would want to do that. The Sigma F2.8 70-200 HSM is not really well known for its image quality in comparison to tammy of the same spec. Moreover, the Sigma F4 100-300mm is known for fast focus and amazing sharpness. So that would be far better than the 70-200 plus TC.

You should try to figure out if you are going to the use the Sigma F2.8 70-200 primarily in its native focal lengths in the 2.8-4 aperature range a lot because otherwise I would just go with the Sigma F4 100-300mm.
I prefer the Sigma because it has HSM. I currently have a non-HSM version. I would like faster focusing. The Tamron 70-200 is still screw-drive (and has wicked fringing).

I don't want the 100-300 f4 because it can't do f2.8 (their 120-300/f2.8 would be great, but I don't think they do it for Pentax, and it's wayyyy expensive). Some games I go to under lights require f2.8, in which case I have to take off the TC and make do with only up to 200mm, and I still only get 1/350 ISO3200-4500.

As I already have the 70-200 and have used it, along with the TC, for thousands of images I already know what I need. Thanks for the suggestion though, I have often considered that option, as well as the Pentax 60-250, but again only f4.
11-18-2009, 04:43 PM   #4
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As can be seen in my intial question I'm not asking about IQ. I only want to know-
a) Does the Tamron TC work with HSM ON THIS LENS (I know it's patchy on some others)
b) If it works, is the AF still okay, ie. still on a par with using it without the TC?

It's really bizarre to me how Pentax are dragging their heels on a TC. Just look at all the queries on here about it!

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