[Stavri]

However, I know there are times when I'll want more zoom. I've always avoided the big lenses but am now rethinking the Sigma 120-400 and the Sigma150-500. I'd probably try to pick one up on eBay.

If anyone uses either of these lenses on a Pentax, can you confirm that the lens IS works? Are you able to hand hold these lenses? Is the IQ pretty good?

Any comments appreciated from users. Thanks, folks!

Jack

The 120-400 is harder to come by of the two. I hear Greinerstudio has a 120-400 that is looking to sell, send him a private message if you like

[Srhphoto]

I'm another very happy 150-500mm user. I tend to use the lens image stabilisation (and hand hold it), as it does such a superb job of completely steadying the viewfinder view. The following was shot handheld at 500mm:-



I've found the lens super sharp at 500mm as well.

Cheers,

Simon.

[VisualDarkness]

My copy was one without IS and it never let me down, even at max aperture.

500mm F6.3


500mm F7.1


It even held up with a Kenko 1.5x at max aperture at 500mm