Originally posted by BarryE The new FF Pentax 70-200 is 1755g.
Well, big 70-200 zooms with f4 or faster tend to be heavy. Sigma's is 1.4kg.
If you check
this thread, you can see the
DA* 60-250 is "
officially rated "designed for FF" by Pentax patent US7489452." Maybe it fits your bill? And I think the
DA 55-300mm F4-5.8 ED is considered FF-compatible on the tele end and is very light, affrodable. Of course, its aperture and sharpness probably cannot reach the big, heavy 70-200mm zooms. The HD WR version might be a decent compromise, though. I know lots of forum users see it as best affordable telezoom; plus, the new one is HD and WR. These might be small advantages over some older and third party telezooms
This thread here has some more lenses listed, but I am not sure when it was last updated. There are some more lenses listed throughout the thread pages
https://www.pentaxforums.com/forums/10-pentax-slr-lens-discussion/183420-curr...me-lenses.html
---------- Post added 26th Dec 2015 at 13:36 ----------
Originally posted by BarryE ** I want to say I am very pleased with the results I achieve with my k3 kit and I sell prints up to A2, but clearly a bigger/latest sensor would help me cope with conditions that the k3 struggles with.
One more thing.. when it comes to telephoto, APSC has the "crop advantage", as some people put it. Not sure how valuable this is to you. With modern sensors, high ISO performance is already unimaginably better than it was some years, a decade, ago. And Noise Reduction software is improving, as well. The little advantage that high end FF sensors have over APSC sensors is becoming less and less significant
The other thing you might consider is the 1.4 TC. I think this TC also increases the image circle size, so it might make APSC lenses more compatible with FF. I think there were threads about this, feel free to look for them.
And finally, Yes, the FF will (should) have better sensor performance than the current lineup. But after a year or two, the APSC cameras will narrow that gap. Of course, by then another high end FF might be released. You know how it is. But APSC is not all that terrible and maybe K-3II is good enough now, and the next APSC flagship will be good enough when it comes out. You can save some money (which you can invest in tripod, lenses), carry a lighter camera (can be helpful if you are tricking with tele lenses), and give you a crop magnification advantage.