Originally posted by Homo_erectus I love my k5ii. It's a great camera that has served me really well over the last few years. It's got just under 29K shutter releases on it and it's going strong. I do need to clean the sensor though. I suspect that's more a result of me not being careful enough when changing lenses than anything wrong with the camera itself.
Initially I bought a stable of Tamron and Sigma lenses because the price of Pentax lenses seemed too high. And I wanted "fast" lenses. And I hadn't figured out what and how I like to shot so I had no idea which lenses would really be the ones that I needed. Now I have a much better idea and so I recently sold my Tamron 70-200 F/2.8 and replaced it with a Pentax DA* 60-250. The 60-250 is such a fine piece of equipment, it works so beautifully and produces such excellent images, that I'm really regretting spending the money I did on the third party lenses.
I few months ago I purchased the Tamron 70-200 f2.8 after spending a few months torn between it and the Pentax. Finally settled on the Tamron and a Sigma 17-70 instead. On a recent trip out west they served me well. This purchases tripled the number of auto focus lenses that I own. The new Tamron replaced my almost legendary Tamron 70 - 210 f3.5 that I have owned for over 25 years. I absolutely love that lens and it's "macro" capability. Plus one ring to control zoom and focus makes is a very fast handling lens.
It has served me well, but I find that manual focusing on these APS-C cameras a bit of a challenge. Nothing snaps into focus like it does on my old film cameras and focus confirmation is not as accurate as I thought it would be. A trip through Yellowstone last year was a photographic disaster, (Focusing issues on my part as I relied on focus confirmation way too much.)
I passed on the 60-250 lens because if Pentax does announce a full frame camera I need lenses to work with it. Since I already have the Pentax 12-24 DA and the Sigma 17-70 lenses I don't want to spend any more money on lenses that are limited to the APS-C cameras only. Other that lusting after a few of the BIG primes, my next purchase will probably be the Sigma 150 -500 lens.
For me at my age, full frame is more about the viewfinder than image quality as digital imaging quality is approaching that of film even with the APS-C sensors.. I am 63 and have been wearing glasses for 58 years and I have a sneaky suspicion that your eyes don't get better with age. Even with my auto focus lenses, I still find myself switching to manual focus more quite a bit. Having a great viewfinder is very important to me for that reason.