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10-09-2010, 12:54 PM   #1
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Opinions of Sigma 120-400mm lens ?

I like to buy Pentax lenses for my K10D and KM (K2000).

My wide angles are well covered with a 12-24mm, 16-45, 18-55, 10-17mm fish eye.

Telephoto wise I have the Pentax 55-300mm which on the digital bodies is the equivalent of around 460mm, I think.

The 55-300mm takes superb quality pictures even at the extreme long end...@ 300 mm.

But lately....I've wanted more reach.

As we Pentaxians know that although Pentax had a great telephoto range before digital....nowadays as far as modern lens go....the DA 300 is as far as it goes in focal length.

The DA 300 is one great lens....but not long enogh for me.

I recently tried a Sigma 120-400 F 5.6 and although I didn't take any pix I was very impressed with it's apparent build quality.

It is very heavy and I'm happy to see a tripod mount on the lens...strictly tripod or mono pod ....mostly...I would think.

I have heard that the 120-400 is one of Sigma's best lenses.

Does anyone have any experience with one...wat are the pluses and minuses...how does the final product the picture quality, compare to a Pentax 55-300mm or DA 300 ?

Thanks, Les

10-09-2010, 01:45 PM   #2
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I have no experience with the Sigma, but I do with my 55-300 and 1.5x Kenko TC. I don't doubt a native 400mm zoom can kick this combo's tail, but the IQ per gram (or kilogram!) is mighty good with this duo, and a chunk of it can stay in my pack or pocket most of the time.

Just took these from my porch on a grey day (iso2500) - the big one is 450mm effective (lens set at f/6.3), lower left is TC and lens at 200mm, lower right is just 55-300 maxed out. Just jpg, no tweaks just a Picasa collage.

10-10-2010, 09:09 AM   #3
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Previous Thread

There was a previous thread here:

https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/111621-sigma-1...tried-yet.html

and there is a link to a few test shots that I made with the lens. Overall, I was very impressed with it. The quality of the build is excellent - almost on a par with the EX line and the IQ is very good. I tested it with an older Tamron 1.4 PZ teleconverter and found that the images were still very good and that SDM focus still worked, although slower.

I recently sold it as I found I was doing little shooting at the 400mm range and a 70-200mm will better suit my needs.

Mike
10-10-2010, 07:37 PM   #4
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Original Poster
QuoteOriginally posted by jimr-pdx Quote
I have no experience with the Sigma, but I do with my 55-300 and 1.5x Kenko TC. I don't doubt a native 400mm zoom can kick this combo's tail, but the IQ per gram (or kilogram!) is mighty good with this duo, and a chunk of it can stay in my pack or pocket most of the time.

Just took these from my porch on a grey day (iso2500) - the big one is 450mm effective (lens set at f/6.3), lower left is TC and lens at 200mm, lower right is just 55-300 maxed out. Just jpg, no tweaks just a Picasa collage.
I've got a Takumar 2 XTC....I've never used....after seeing your pictures, I think I will attach to my 55-300.

10-10-2010, 07:38 PM   #5
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QuoteOriginally posted by Stringmike Quote
There was a previous thread here:

https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/111621-sigma-1...tried-yet.html

and there is a link to a few test shots that I made with the lens. Overall, I was very impressed with it. The quality of the build is excellent - almost on a par with the EX line and the IQ is very good. I tested it with an older Tamron 1.4 PZ teleconverter and found that the images were still very good and that SDM focus still worked, although slower.

I recently sold it as I found I was doing little shooting at the 400mm range and a 70-200mm will better suit my needs.

Mike

Thanks Mike...I'll check that link out.

Les
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