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10-10-2010, 10:35 PM   #1
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Sigma 70-300mm APO or Tamron 70-300mm?

I'm getting ready to buy a telephoto lens. Right now it is a toss up between the Sigma 70-300 APO and the Tamron 70-300.

One of my other hobbies is astronomy, and from that, I know that an APO refractor is MUCH better than a non APO refractor for star sharpness and low or no CA. I am wondering if this crosses over to camera lenses?

I'm leaning towards the Sigma because of its APO design, but I've heard good things of the Tamron as well.

Anyone use both? Which would be better for landscape/nature?

Thanks.

10-10-2010, 11:27 PM   #2
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Check the forum lens database for a start: Third-Party Lenses for Pentax - Pentax Third-Party Lens Review Database. These are always very insightful comments from real users.

Then you may try the independent review websites www.slrgear.com and www.photozone.de.

The Sigma 70-300mm APO was tested by slrgear.com:
Sigma Lens: Zooms - Sigma 70-300mm f/4-5.6 DG Macro APO (Tested) - SLRgear.com!
There are several Tamron 70-300mm lenses and one test at slrgear.com is:
Tamron Lens: Zooms - Tamron 70-300mm f/4-5.6 Di LD Macro 1:2 AF (Tested) - SLRgear.com!
...
10-10-2010, 11:31 PM   #3
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Get the sigma

Its exactly as you wrote. My copy of tamron has huge CA and purple fringing at the 200-300 mm end and is also quite soft. I would get the sigma if you are not considering the price between these two
10-11-2010, 09:27 AM   #4
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QuoteOriginally posted by luck1 Quote
Its exactly as you wrote. My copy of tamron has huge CA and purple fringing at the 200-300 mm end and is also quite soft. I would get the sigma if you are not considering the price between these two
Strange, mine does not.

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10-11-2010, 02:51 PM   #5
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Hmmmm, to my eyes that second pic has a significant amount of purple fringing.
10-12-2010, 01:02 PM   #6
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QuoteOriginally posted by twitch Quote
Hmmmm, to my eyes that second pic has a significant amount of purple fringing.
One of us needs to make a trip to the eye doctor.
10-12-2010, 02:49 PM   #7
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When these threads come up, the usual answer around here is "neither -- get the Pentax DA 55-300mm." It's considerably more expensive, but most people deem the difference worth the price.

I used to have the Tamron 70-300, but I sold it because I simply couldn't overlook the purple fringing. It was pretty bad. I don't have any autofocus lens in that range now, so feel free to take my opinion with a grain of salt.
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