The lens gives a viewing angle of 1800 at 10mm and 1000 at 17mm and being a DA format lens this equates to a 15mm-25.5mm full-frame equivalent.

Traditionally fisheyes are often used for aerial-, underwater- and some kind of indoor photography. Due to the uncorrected extreme field-of-view the fisheye perspective can produce some oooohs and aaahs from your audience but it shouldn′t be used too often in presentations because the effect of...

What a great lenses. Wow! So many great pictures. Really in love. Money well spent.

I have the Pentax 12-24 lens already, but found that I really wanted something that was going to offer another perspective. The DA 10-17mm f/3.5-4.5 ED(IF) by Pentax offers a fish-eye look at 10mm while having minimal distortion by 17mm.

fisheye at 10mm but pretty straight at 17mm

hard to add polarizing filter

This lens is so fun! I bought it at first with some hesitation that I might not use it as often because it is seemingly "less practical" than normal lenses. But this has become my favourite lens to bring everywhere! You can really be creative with this lens and take some specacular pictures.

Pentax build quality; quick AF; light

Can't attach filter to protect lens (like most fisheye lens

Originally I was looking at this for external architecture and museum interiors. I am amazed at how close your able to get to the subject and still capture everything. The ability to take in 180 degrees is great, and with software your able to remove the fisheye effect if needed.

Great quality and construction finish; Feels like a fine instrument; Dead on instant focus - no hunting; Great bag/case

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I love it! I'm still giving it 5 stars even though I have a few complaints. I use this for real estate photography. I had been reluctant to buy it because almost all reviews were about fisheye, fisheye, fisheye. However it is very workable for indoor use if given the chance.

I orginally wanted a wide angle and rented this lens since the wide angle was unavailable. The lens is a great fun lens and you can do a lot of creative shots. Great for night photography if you have a subject that has a lot of curvature.

This lens is one of hardest to use because of image distortion is very serious. However, once you have used, you can't stop because it makes the object emphasised. So Great!!!

It works well for what I want, a fisheye to wide angle zoom. Cuts down the number of lenes I absolutely must take with me. Solid feel, a good quality product. That said non-zoom lenses are better, but only just.