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12-30-2010, 07:32 AM   #1
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Zoom for K7

I am stuck in trying to choose a zoom for my k7. It is between:

Pentax 55-300 f/4-5.8 ED
Sigma 70-300 f/4-5.6 APO DG Macro Autofocus
Sigma 70-300 f/4-5.6 DG OS Telephoto Zoom

PLease explain your choice. Will the sigma with the Macro be as sharp at 300 as the others? My other lens is Pentax 18-55. Thank you

12-30-2010, 09:56 AM   #2
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There's also the Tamron 70-300. You should check the PF lens review section and also Photozone. Good luck
12-30-2010, 10:16 AM   #3
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There are truly about 10 threads on the comparisons of these lenses. They all conclude about the same way - the Pentax 55-300 has the best image quality for new budget zooms lens at $350 or less.
12-30-2010, 12:54 PM   #4
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What SpecialK said. The Pentax 55-300 is in another league .... even more so when the low price for a lense of this quality is considered. As someone else said the other day - the best value lense in the whole Pentax range.

Just do a search on here for a dozen more threads on this lense.

12-30-2010, 01:57 PM   #5
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When I was looking for a lens in this range, I rented the Pentax 55-300. I found it soft at the long end, perhaps it was that particular copy. I ended up buying the Tamron 70-300 LD Di Macro for around $175. It's a good lens for the price.

Best 'o luck in your search.
12-30-2010, 11:00 PM   #6
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Maybe you had a bad copy as you suggested iCrop, or it had been damaged by a previous renter.

I've had the Pentax 80-320, then the Tamron 70-300 LD Di Macro (still in the cupboard but unused now) and now the Pentax 55-300. Whilst the Tamron is very capable of sharp shots (and the 1:2 macro is a great asset to have without changing lenses) there is absolutely no doubt the 55-300 is streets ahead ... there are many threads on different forums that endorse this fact.
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