Originally posted by QuestionableCarrot Hi
Really enjoying my K-x with kit 18-55 and 55-200 lenses but need something longer for birding in the near future.
I have my eye on the Sigma 150-500 OS HSM lens and want to know is that going to be ok with the K-x?
The unfortunate thing is I have heard stories of bad copies and malfunctions.
Here is the lens that I am thinking of purchasing :
SIGMA 150-500 F5.6-6.3 OS HSM - PENTAX -NEW-UK DEALER! on eBay (end time 01-Apr-11 18:11:32 BST)
The Pentax has in built stabilisation so will this be ok with OS turned on etc?
Your thoughts and opinion...
Many thanks
QC
The Sigma 150-500mm works great with the K-x. I've gotten very nice results at 500mm and F/8, which gives me at substantially more reach than I could get with the 55-300mm, which is another good choice, and a good first telephoto lens as well. I tend to use the 55-300mm when hiking, and the Bigma when I'm going out specifically to take photos.
The Sigma 150-500mm down sides for me are that its heavy, and DOF is shallow at close distances, making focus pretty tricky. Also, you need pretty good shutter speeds for small birds, because they're so active, so its harder to use with overcast skies. Also, apparently, some copies are better than others. I'm still learning how to best use the super-telephoto for birding, and what works best for monopod, shutter speeds etc, especially in cloudy conditions. Here is a recent 1:1 crop, sharpened for the web, so this crop is roughly 2650mm film equivalent in focal length, with the photo taken from 50' or 60' away.
(same 1:1 crop before sharpening, Pentax Kx bright settings, straight from the camera, ISO400, 1/640, F/8
http://www.sheltx.com/share_stuff/IMGP4099x.jpg )