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DPChallenge Forums >> Hardware and Software >> Pentax vs Sigma Zoom?
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Showing posts 1 - 5 of 5, (reverse)
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 12/07/2006 08:03:29 PM · #1
Pentax Zoom Normal-Telephoto SMCP-DA 50-200mm f/4-5.6 ED Autofocus Lens for Digital SLR

Sigma Zoom Telephoto 70-300mm f/4-5.6 APO DG Macro Autofocus Lens for Pentax AF

How would these two lens compare to each other?

Thought I read someplace that the pentax 50-200mm was equal to something like a ?-310mm in a 35mm film camera.

Is that how the specs are on the Sigma lens?
Is the sigma showing the zoom as a film camera?

Would I be getting a bigger zoom with the sigma?

What about the APO DG on the sigma, what is that going to do for me?
This same sigma without the APO is about $80 cheaper?

Thanks for the input..

12/08/2006 01:23:51 PM · #2
Any input would be great.
Even if you don't own eather one, based on what you do know about zoom lens what lens would you buy?

Edited to add: I would be using this lens outdoor for soccer and baseball shots along with shots at the zoo.

Would really love something more down in the 2.? range, but a little out of my price range for now. :)

Message edited by author 2006-12-08 13:25:39.
 12/08/2006 01:38:09 PM · #3
OK, on this range of glass they are going to be about the same quality, I have the sigma lense for my Canon and it is very nice, just remember at 300 mm you want a fast shuttre or a tripod.

Also that camer has a sensor crop of 1.6 I think so multiply the 70mm-300mm by 1.6 to see the approx crop factor in comarison to a full sensor or 35mm film. The image is not actually magnified more just cropped giving the same apperance as say at 70mm of being a 112mm lense.
 12/08/2006 04:27:00 PM · #4
Originally posted by nemesise1977:
OK, on this range of glass they are going to be about the same quality, I have the sigma lense for my Canon and it is very nice, just remember at 300 mm you want a fast shuttre or a tripod.

Also that camer has a sensor crop of 1.6 I think so multiply the 70mm-300mm by 1.6 to see the approx crop factor in comarison to a full sensor or 35mm film. The image is not actually magnified more just cropped giving the same apperance as say at 70mm of being a 112mm lense.


Is the pentax lens the same for the 1.6 crop?
 12/08/2006 04:41:54 PM · #5
Originally posted by lakota:
Originally posted by nemesise1977:
OK, on this range of glass they are going to be about the same quality, I have the sigma lense for my Canon and it is very nice, just remember at 300 mm you want a fast shuttre or a tripod.

Also that camer has a sensor crop of 1.6 I think so multiply the 70mm-300mm by 1.6 to see the approx crop factor in comarison to a full sensor or 35mm film. The image is not actually magnified more just cropped giving the same apperance as say at 70mm of being a 112mm lense.


Is the pentax lens the same for the 1.6 crop?

Just multiply whatever the focal length is by 1.6...meaning the 55-200 is 35mm equivalent to 88-320.
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