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

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

None

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.

This lens is included fisheye function 180 degree at 10mm and ultra wide 100 degrees at 17mm. Sure, there is lots of distortion in 10mm because it is fisheye, but it is not a bad point you cab create many creative photo from it. At 17mm, you can take 100 degree with just a few distortion.

Both fisheye and ultra wide in the same lens; good build quality

Cannot install filter; an unique design of lens cap if lost it have to pay much for it

An unusually well made fun lens which has full metal construction even the inner barrels.

Full metal barrels; decent sharpness across the frame

Visible CA

This is a very fun lens to use. It provides full frame images on a digital slr through the entire zoom range. It is about the equivalent of a 15-26mm lens on a 35mm camera. It is a great match for the 18-55 kit lens that comes with most Pentax digital cameras.

Compact size; Good quality optics; Smooth operation; Zoom

No filter system; Only useable on digital cameras

This is an excellent lens, perfect for multiple uses. It is perfect for landscape photography, live band photography and has displayed amazing results with nighttime photography. I've been using this on my K-5 alongside the 18-135mm lens and it has become my favourite lens yet!