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12-09-2013, 04:59 PM   #31
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There is a 100-300 in the marketplace now.

12-10-2013, 10:59 AM   #32
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QuoteOriginally posted by crewl1 Quote
There is a 100-300 in the marketplace now.
Haha, I sent the OP a PM on that yesterday...
Don`t we love spending other people`s money?
12-10-2013, 12:02 PM   #33
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QuoteOriginally posted by audiodoc Quote
HI Giklab, thanks for the info esp about the TC's. For the wide end I was just going to bring a panasonic bridge camera. On my last trip, I seldom ever used the wide angle range. My first instinct was to go with the 50-500 but then I read greater reviews on the 150-500.
I'm posting a bit late but hopefully not too late to help. In my opinion it's a close call between the latest Sigma 50-500 OS HSM and Pentax 60-250.

I have the latest version of the Sigma 50-500 and am satisfied with the sharpness on my K-5. I really like the OS because it has a panning mode; the lens stabilizes in the up-down direction while you can pan left-right to follow birds. Note that older versions of the 50-500 might be softer at 500mm than the latest version so be careful if buying used.

The Pentax 60-250 is undoubtedly sharper at 250mm. Once you crop to a 500mm equivalent I don't know whether Pentax or Sigma gives a better image (but they'll both be good). If carrying weight is a concern on your trip the 60-250 weighs half as much as the Sigma.

The Sigma 150-500 has no advantage, other than cost, over those 2 lenses. It's weight is nearly the same as the 50-500. You lose the ability to zoom out beyond 150mm; going wider lets you take some landscape and people shots without changing lenses.

The Pentax 55-300 is a good, inexpensive, lightweight lens. It's one of the best bargains in Pentax-land, but the 60-250 and 50-500 will give better images. In my opinion the 55-300 is a perfect lens to keep in your bag in case you unexpectedly need a lot of zoom, but for a safari where you know you'll need telephoto stick with the 60-250 or 50-500.

Alternatively, there's the Pentax 300 prime. Maybe the best image quality but limits you to a single focal length; might be a showstopper if you are only bringing one lens.
12-10-2013, 12:26 PM   #34
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@ DeadJohn

Could you post shots taken from the same spot with the DA at 250mm and the Sigma at 400mm and 500mm? I'd be ultra interested.

12-10-2013, 02:07 PM   #35
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QuoteOriginally posted by Giklab Quote
@ DeadJohn

Could you post shots taken from the same spot with the DA at 250mm and the Sigma at 400mm and 500mm? I'd be ultra interested.
Sorry if my post was misleading; I don't actually own the 60-250. What I said about the 60-250 was based on my comparison of the 60-250 and 50-500 a while ago. I took a few handheld shots then examined them by zooming on the rear LCD. Both lenses gave excellent results but it was a very unscientific test. I wanted extra reach for birds and sunspots (with a solar filter!) so bought the 50-500. The long Sigma warranty was also a selling point.
12-10-2013, 02:55 PM   #36
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Ahh, ok. No problem.
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