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02-06-2017, 03:44 PM   #1
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Tamron 70-200mm F2.8 Di LD Macro - Teleconvertor Compatibility?

Folks,

I was wondering if anyone could help to confirm which Teleconvertors would be compatible with my Tamron 70-200 f2.8 Di LD lens? I've been considering longer lens options but given the price of these and the fact that the Tammy seems a really good performer I've been wondering if I could add a 1.4x TC to get a bit more range when wanted but I'm not sure where to start.

Normally I'd have looked at picking up an own brand Tamron TC but there doesn't seem to be one available, would a Pentax, Sigma or Kenko TC be compatible?

02-06-2017, 04:02 PM - 1 Like   #2
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I know the Pentax one works just fine with it.
02-06-2017, 05:58 PM   #3
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Most teleconverters should work with it but research against specific converters is wise. You do lose a full stop of light and some image quality of course.
That said the Tammy is pretty sharp - I used a generic 2 x converter with mine and IQ was pretty good (better than the old Soligar 400 I have anyway) - and I found better than cropping a 200mm image but not by a huge amount. Certainly a 1.4x converter would do better.
Another point is my Tammy was not interested in auto-focussing on my K-5 with a 2x converter. Have not tried a converter with my K-1 yet but mostly likely won't bother until I get hold of a 1.4x converter anyway.

I'm not sure which body you are using but I found the Tammy focussing better on the K-1 than it did on the K-5 with PD. And for liveview focus works well on K-1 where as could not get to work at all on K-5.
02-06-2017, 08:21 PM   #4
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I've found the Pentax 1.4x HD works very well on my Tammy.

02-06-2017, 09:44 PM   #5
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I'm using the Tamron PZ AF MC4 1.4 on my Tamron 80-200 f2.8, and it works very well.
02-07-2017, 01:02 PM   #6
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Pentax 1.4x HD converter works fine,
Kenko 1.4x hunts a lot and can get stuck at extreme focus end without any intention of coming back.
02-07-2017, 03:41 PM   #7
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Remember that the Tammy is screwdrive so easier to use with TCs.

The Sigma 70-200 has its own motor and should be used with a Sigma TC.
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