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06-25-2009, 06:34 PM   #1
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New Sigma lens front focuses slightly...

Just received my Sigma 24-70mm EX F2.8 Macro. Wow - this lens has a solid feel to it. More so than any digital Zuiko or prior Sigma lens. Focus is quick and images seem sharp - even wide open, but it does appear to front focus slightly - about 1-2 cm. Not much and so far is not evident in normal shots, but with close-up (or quasi-macro) shots it is apparent.

What's best, send it back to the store and hope for a better or copy (and risk a worse copy) or send it back to Sigma? It stinks to have to do this after just receiving it, but I knew buying Sigma meant this possibility.

Thanks.

06-25-2009, 07:22 PM   #2
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what camera? the k20 you can adjust..

are you also shooting under tungsten.. as i got caught out with that

thanks

steve
06-25-2009, 08:00 PM   #3
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Sorry - K200D. Does the lighting affect the ability to accurately focus? It was indoors - mixed lighting.


QuoteOriginally posted by 5teve Quote
what camera? the k20 you can adjust..

are you also shooting under tungsten.. as i got caught out with that

thanks

steve
06-25-2009, 08:46 PM   #4
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QuoteOriginally posted by joeyc Quote
Sorry - K200D. Does the lighting affect the ability to accurately focus? It was indoors - mixed lighting.

Please go to the #11 post in this thread where I got my ears pinned back with information new to me on the lighting wavelength effect on focusing accuracy.
https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/64170-da-16-45-questions.html


Last edited by imtheguy; 06-25-2009 at 08:55 PM.
06-25-2009, 08:51 PM   #5
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QuoteOriginally posted by imtheguy Quote
Please go to the #11 post in this thread where I got my ears pinned back with information new to me on the lighting wavelenght effect on focusing accuracy.
https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/64170-da-16-45-questions.html
Thanks for the link... Very interesting to me. I never experienced this before with Olympus or Nikon. I will have to do some testing outside to rule out the lens.
06-26-2009, 09:43 AM   #6
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QuoteOriginally posted by joeyc Quote
Thanks for the link... Very interesting to me. I never experienced this before with Olympus or Nikon.
Did you test for it? As far as I know, they are not immune from the physics that causes this phenomenon.
06-26-2009, 09:48 AM   #7
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Yes, I tested it. I'm sure it occurs - I suppose I was fortunate. I have heard of more issues with Nikon than Olympus, but like you said all manufacturers could be open to this issue.
06-26-2009, 04:04 PM   #8
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Did some quick rudimentry tests outside. Focus wide open was spot on. Must have been the lighting. I will certainly monitor this to make sure there isn't an issue. I appreciate the help.

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