Would be almost perfect, if it were not for the autofocus
Manuel Antonio Arce Arenales "MAAA", Amazon
8 May 2014
Summary: Top notch quality lens, small, compact, elegant and very well made. The metal build and high tolerances are very close to the standards one has come to expect from the Pentax series of limited lenses. Optics and performance are excellent, and the weather resistant design certainly adds to the value of this lens.
Summary: I like my K5 but I have not bought any new lenses other than the 18-55WR that came with the Camera. I have some Film Era zoom lenses, a FA50 f1.7 prime, and some manual focus primes as well as 3 other Pentax Film bodies. The FA50 is good glass, the other primes are OK glass, and the zooms are a mixed bag. Now this lens, 100mm f/2.8 WR, well it is Terrific Glass (I need a stronger synonym but I am too lazy to find one right now).
Excerpt: I consider myself an advance amateur photographer. I mostly photograph landscapes, buildings, church events and some macro of flowers. I had a Canon 100L IS macro lens with a Canon 5D, which I enjoyed very much for flowers & landscapes, and thought a quality 100mm micro lens would work well with the Pentax crop camera. For landscape I use a tripod, but not when photographing flowers and with the Canon setup there wasn't problem.
Pros: Durable Construction, Easy to handle, Excellent Broka, Good Colors, Very Sharp
Excerpt: This is my favorite lens. It is so sharp, lightweight, and fast that I probably overuse it in place of more versitile zoom lenses. The weather resistance and long hood make this very useable in foul weather. My only criticism is that often the focus decides to go to infinity and back. So I take advantage of the clutched manual focus to "prefocus" to reduce this tendency.
Excerpt: This is suberb macro lens.<br />It has excellent IQ and bokeh.<br />It's small and light.<br />It's WR and rugged.<br /><br />The only flaw I have found is that there's no focus limiter, which makes focusing slow if the motor has to drive from one end to other.<br />But for macro shoots I use manual focus, so for the intented use it's ok.
Pros: Consistent Output, Durable, Lightweight, Nice Bokeh, Rugged, Strong Construction
Summary: If your running Pentax - this is a great lens. Note - prices are going down here in June 2012. Excellent macro capability, fantastic color rendering, tack sharp and metal construction makes it an all around great package. Pentax makes some fantastic lenses - and if you are using their system - this is a great lens - especially with a weather resistant camera like the K7, K5 and the upcoming K30 - this is a great compliment for a good weather tough package.