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05-10-2011, 01:34 PM   #1
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Pentax 10-17 or Sigma 10-20 ?

Another controversy discussion. I'm looking into VR-360-panos and therefor I need an UWA. Question is, if the Sigma is wide enough or should I really go for a DA 10-17.

Pricewise I can get a brand new 10-17 (ok, Samsung branded) for about $460 while the cheapest offer for the Sigma 10-20 3.5 is around $670 (all prices converted to US$).

Any comments?

05-10-2011, 01:45 PM   #2
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Depends on if you want to deal with de-fishing, I'd think. And you could always get the Sigma 8-16 if you need wider but still rectilinear.
05-10-2011, 02:13 PM   #3
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You'll probably want panos to be rectilinear. Not sure how stitching will work out with the FE!
05-10-2011, 03:33 PM   #4
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I wouldn't bother with dealing with stitching fish eye images. Stick with rectilinear lenses, and the Sigma 10-20, either version, or Tamron 10-24 should do the job for you quite well.

05-10-2011, 05:04 PM   #5
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The DA10-17 fisheye zoom, the lens that drove me to Pentax in the first place, is a splendid beast, and is totally different than the Sigma 8-16 or 10-20's, the Tamron 10-24, and the DA12-24 ultrawides. The fisheye produces rounded distortion; the ultrawides produce rectilinear distortion. IMHO none are really suited for shooting accurate panoramas. If you look through any rectilinear 24mm or wider lens, you'll see the edge distortion as you pan. You'll get least distortion with a lens in the 28-35mm range, and a 28mm grabs a wider FOV than does a longer lens.

My recommendation for shooting accurate panos: A good 28mm lens, maybe the M or A 28/2.8 or Takumar 28/3.5, or one of the excellent Vivitar 28's -- f/2 or 2.5 or 2.8. Stop down to f/8. Orient the camera vertically (portrait mode) on a tripod. If your pano will include nearby objects, stuff closer than 6m / 20ft, you might want a pano mount for the tripod, to eliminate parallax errors. These tactics will give you the highest-quality panos. Good luck!
05-11-2011, 07:10 AM   #6
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QuoteOriginally posted by Adam Quote
You'll probably want panos to be rectilinear. Not sure how stitching will work out with the FE!
Actually VR-stitching is fine with fisheye. Most of my friends recommend the 8mm Sigma as the VR-Pano-lens.

But I'd like to be more flexible and would like to have a zoom-lens. I agree with you, that for general shooting, the lens should be rectilinear more or less.

So - the question is now more like Sigma 8-16 or Sigma 10-20. I have read both lens reviews in the forum and looked at a lot of images on flickr, etc. but still can't really make my mind.

What would you guys recommend or tell me for consideration?
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