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!

I was wary of buying this lens, as a fisheye is quite a niche item. However, I am delighted. I also have the Pentax 12-24mm and at the same focal lengths it is just as good, though this is fisheye so looks a lot wider.

Consistent Output; Lightweight; Quick Focus; Sharp Focus

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

v This strange lens offers the distorted view of a fisheye lens, with the convenience of a zoom lens. It offers a 180degree field of view, from corner to corner when set at 10mm and the equivalent of a 25.5mm lens on a 35mm camera, with lots of barrel distortion, at 17mm.