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05-27-2010, 01:58 AM   #1
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Something light and long for a K-x

Hi Mr B&H,

Been thinking of adding a converter to my Tamron 70-200, or a longer lens (the Tamron 300-500 would suited me just fine, but alas not for us Pentaxians).

Any suggestions - does Pentax have something suitable? How bad is using converters?

Thanks a lot,

Tord S Eriksson,
who's awaiting a K-7 Mark II :-)!

05-27-2010, 11:59 AM - 1 Like   #2
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If given the choice, it's always best to use a lens with the focal length you need as opposed to using a teleconverter. Results will vary depending on the lens and converter model you use. If you paired Sigma's 70-200 with their converters, you would get excellent results. Using a brand A lens with a brand B converter you may notice a drop in contrast and sharpness.

This Sigma 150-500mm f/5-6.3 DG HSM APO Lens is an ultra telephoto zoom lens ideal for nature, wildlife, or sports photography. This zoom range translates into an equivalent range of 225-750mm when used with a Pentax digital SLR camera.

Sigma | 150-500mm f/5-6.3 DG HSM APO Autofocus Lens | 737109

The Bower SX7PK 2x Telextender (also known as a tele-extender) will multiply the focal length of your existing lens by 2x, and will cut back the amount of light by 2 f/stops while maintaining full autofocus coupling.


Bower | SX7PK 2x Telextender | SX7PK | B&H Photo Video




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11-25-2010, 03:09 PM   #3
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Eventually I got myself a Sigma 120-400, but I would like something longer :-)! So an teleconverter could come in handy!
11-28-2010, 09:59 AM   #4
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Hello,

Sigma supports both of their converters for the 120-400mm lens.

http://www.bhphotovideo.com/c/search?Ntt=sigma+tele+Converter+pentax&N=0&Ini...5981/

Lens - Teleconverter Compatability Chart


Chuck

11-28-2010, 06:51 PM   #5
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I have the Sigma lens in my wishlist...
01-27-2011, 04:00 AM   #6
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QuoteOriginally posted by Chuck-B&H Quote
Hello,

Sigma supports both of their converters for the 120-400mm lens.

sigma tele Converter pentax

Lens - Teleconverter Compatability Chart


Chuck

Sadly, if you read it carefully, their converters don't work with Pentax cameras (but almost all other brands) - not on the 120-400mm, anyway - I missed this as well, but the seller was kind enough, and took it back!
01-27-2011, 04:03 AM   #7
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Actually, according to Sigma's chart, the only Sigma lens that works with Pentax cameras and Sigma converters in AF mode is the 100-300/4 and then only the 1.4X converter!

Last edited by Tord; 01-27-2011 at 04:19 AM.
01-27-2011, 04:20 AM   #8
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So instead I got myself an old M400/5.6 and a Pentax 2X converter - needs lots of light, but otherwise just fine!

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