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10-11-2018, 11:38 AM   #1
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DA 1.4x AW AF Rear Converter with K5II and Sigma APO 70-200 F2,8 II EX DG MACRO HSM

Hello,

I have a question about the combination DA 1.4x AW AF Rear Converter with K5II and Sigma APO 70-200 F2,8 II EX DG MACR0 HSM.
I want to buy the Pentax converter, but I'm not sure it wil work with my K5II and the Sigma 70-200.
I wonder if there is someone that has experience with this combination and is willing to share his knowledge with me.
Perhaps it is better to look for a Used Sigma 170-500 f5-6,3 APO DG? This lens is only availeble as second hand because it is no longer manufactured.
All information is welcome.

Hans van Beusekom,
The Netherlands.

10-11-2018, 11:42 AM   #2
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QuoteOriginally posted by hansbeus Quote
Hello,

I have a question about the combination DA 1.4x AW AF Rear Converter with K5II and Sigma APO 70-200 F2,8 II EX DG MACR0 HSM.
I want to buy the Pentax converter, but I'm not sure it wil work with my K5II and the Sigma 70-200.
I wonder if there is someone that has experience with this combination and is willing to share his knowledge with me.
Perhaps it is better to look for a Used Sigma 170-500 f5-6,3 APO DG? This lens is only availeble as second hand because it is no longer manufactured.
All information is welcome.

Hans van Beusekom,
The Netherlands.
Autofocus with the 170-500mm plus a TC might be a bit tricky because of the slower aperture.

Adam
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10-11-2018, 12:37 PM   #3
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That Sigma model won't work with a tc unfortunately ( I have the same one )

The model before does though

Dave
10-12-2018, 12:16 AM   #4
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I have the Sigma APO 70-200 F2.8 II EX DG MACRO HSM and the DA 1.4x AW AF Rear Converter

These do NOT work together on my KP and K-1.

10-14-2018, 04:08 PM   #5
Des
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QuoteOriginally posted by hansbeus Quote
I have a question about the combination DA 1.4x AW AF Rear Converter with K5II and Sigma APO 70-200 F2,8 II EX DG MACR0 HSM.I want to buy the Pentax converter, but I'm not sure it wil work with my K5II and the Sigma 70-200.I wonder if there is someone that has experience with this combination and is willing to share his knowledge with me.Perhaps it is better to look for a Used Sigma 170-500 f5-6,3 APO DG? This lens is only availeble as second hand because it is no longer manufactured.
Welcome to PF Hans.

Even Sigma's own teleconverters don't seem to work with this lens in Pentax mount: Lenses | Sigma Corporation of America

Seems to me that the money you would otherwise spend on the expensive Pentax DA 1.4x TC would be better spent on a lens.

Adding a 1.4x TC to a 70-200 f2.8 lens gives you effectively 280mm f4 (because you lose the equivalent of one stop by adding the TC). Another way to get there would be to get a Pentax DA*300 f4, or one of the previous-generation F*/FA*300mm f4.5 lens. They are all stellar lens in every sense.

Another to consider would be the Pentax DA*60-250mm f4. I've never used one, but it's a much-loved lens too.

Or for a lighter and cheaper, albeit slower, option there's the Pentax DA 55-300mm f4.5-6.3; its maximum aperture is f5.6 up to about 260mm, so a stop slower than the DA*60-250.

I used to have the Sigma 170-500mm non-DG version. It was heavier and bulkier than a 300mm prime, and the image quality was not comparable. The DG version is rated more highly, but I personally I'd suggest one of the lenses mentioned above instead.

Last edited by Des; 10-14-2018 at 05:06 PM.
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