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10-06-2013, 02:24 PM   #1
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DAL 50-300 focus hunt/time

Advance apologies if I've missed the obvious in my search for this information.

This weekend I had the opportunity to use both my DAL 50-300 and my Sigma 17-50mm f2.8 shooting the same subjects under the same conditions. The difference in focus time/hunting was frustrating.

The PF reviews gave the Pentax DAL 50-300 a 7.5 rating on focus speed and a Sigma 70-300 "9". I'd consider buying the Sigma, but since I can't know the reviewers or the circumstances under which the opinions were formed, is there a website with that sort of information based on controlled, standard tests? I've found information on one or the other, but not both by a common reviewer.

Thank you

Banskojoe

10-06-2013, 03:08 PM   #2
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QuoteOriginally posted by Banskojoe Quote
Advance apologies if I've missed the obvious in my search for this information.

This weekend I had the opportunity to use both my DAL 50-300 and my Sigma 17-50mm f2.8 shooting the same subjects under the same conditions. The difference in focus time/hunting was frustrating.

The PF reviews gave the Pentax DAL 50-300 a 7.5 rating on focus speed and a Sigma 70-300 "9". I'd consider buying the Sigma, but since I can't know the reviewers or the circumstances under which the opinions were formed, is there a website with that sort of information based on controlled, standard tests? I've found information on one or the other, but not both by a common reviewer.

Thank you

Banskojoe
Focus throw is what contributes the most to focus speed, so I would look at those specs and go off of that. If Sigma has an HSM model of the 70-300mm, I'd go with that BTW.

Adam
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