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Old Feb 2, 2006, 10:46 AM   #21
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Crashman wrote:
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Okay. now I am confused about the lens sizes.

If I have a 18-125 DC Sigma lens it is a 18-125.

Am I correct?
djwittmieris correct.

ALL lens, whether designed for 35mm or Digital, are multiplied by 1.5 when usedwitha Pentax digital system (Canon lens are multiplied by 1.6) makingthe 18-125mm DC Sigmaa 27-187mm.
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Old Feb 2, 2006, 8:54 PM   #22
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One more newbie question - if you have an old lens, does the focus distance change also? It seems like I have to be further away when using my old Kiron lens than it says on the focus ring (I've always been awful about distances, it could be my imagination and the fact that I've been using a fixed lens camera with a macro mode for 3 years). Thanks again!
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Old Feb 3, 2006, 7:36 AM   #23
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focus distance should remain the same..
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Old Feb 5, 2006, 1:38 PM   #24
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Pentax 50-200mm Lens Test @ 200mm Focal Length

Well, if ever there was any doubt as to whether my decision to scrap plans to purchase either the Sigma or Tamron 18-200mm was the right thing to have done, results that I've just got from the Pentax 50-200mm remove any of that doubt. OK, we are not comparing like with like BUT the quality of the Pentax is, perhaps as you would expect, superior to either of the independants between 50mm & 200mm.

This is the first of 2 shots
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Old Feb 5, 2006, 1:40 PM   #25
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Pentax 50-200mm Lens Test @ 200mm Focal Length

And the second - just look at the difference in clarity
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Old Feb 5, 2006, 7:29 PM   #26
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looks to me also the 50-200 is stellar compared to the others
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Old Feb 6, 2006, 11:04 AM   #27
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Last Post on this comparison - Promise

This shot concentrates on the junction boxes, wiring & labelling on one of the boxes.

The Sigma just does not work as it's clearly out of focus.
The Tamron is a considerable improvement.
The Pentax is a clear winner.
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Old Feb 9, 2006, 4:22 AM   #28
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How much does this pentax 50 - 200 Lens cost?
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Old Feb 9, 2006, 4:34 AM   #29
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Catbells wrote:
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55mm Lens Test

Here's the Sigma 18-200mm & Tamron 18-200mm compared against the Pentax 18-55mm - unfortunately, I ommitted to save the Pentax RAW format.

Sigma still wins over the Tamron, close to Pentax in JPG - better in RAW.

Well.. I amnot quiteable to see why Pentax wins here.. Infact looking at the comparisons it looks like the 18 - 55 lens is not all that great a buy? The pictures are not really sharp and slightly dark too.

The 50 - 200 ofcourse is a clear winner. Not convinced about the 18- 55....
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Old Feb 17, 2006, 4:49 AM   #30
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It looks like the pentax 50-200mm is the winner to me, but my newbie question is can it do Macro? It is not listed as a macro lense so does that means that it cant focus on something up close?
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