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05-18-2011, 09:28 AM   #16
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Quandry

If you had to choose between a Pentax 500mm F4.5 screw mount for under $500 or a Sigma 50-500mm F/4.5-6.3 DG OS HSM Lens for $1659 which would you buy, I started in photography with Manual lenses many years ago so the manual part isn't a problem, I think the anti shake mechanism in the Bigma is a waste of money with the built in anti shake in my K10D and I really have 50 to 300 pretty well covered in my other lenses, but to get up to 500mm I am rather limited in lense choices in my price range. $1600 is really about my budget limit. I am leaning to the Pentax 500mm fixed even though it isnt SMC, which can be corrected with a GOOD FILTER, CORRECT?


Last edited by jjbuzard; 05-18-2011 at 11:32 AM.
05-18-2011, 11:39 AM   #17
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QuoteOriginally posted by jjbuzard Quote
If you had to choose between a Pentax 500mm F4.5 screw mount for under $500 or a Sigma 50-500mm F/4.5-6.3 DG OS HSM Lens for $1659 which would you buy, I started in photography with Manual lenses many years ago so the manual part isn't a problem, I think the anti shake mechanism in the Bigma is a waste of money with the built in anti shake in my K10D and I really have 50 to 300 pretty well covered in my other lenses, but to get up to 500mm I am rather limited in lense choices in my price range. $1600 is really about my budget limit. I am leaning to the Pentax 500mm fixed even though it isnt SMC, which can be corrected with a GOOD FILTER, CORRECT?
A filter will not correct for uncoated glass; filters perform a different function than coatings. Of course, this is true of color; you can throw filters on it and shoot B&W and improve uncoated glass' performance to nearly match coated glass (because you limit to one color of light *and* reduce diffraction)

I've got Bigma, and love it; mine does not have OS, but I've read that on really long lenses, OS is better than body-based stabilization. I don't have any trouble hand-holding Bigma, though, so *shrug*.

If the 500 is coated, I would certainly be tempted because of the higher speed - and possible better IQ; almost certainly better than my Bigma stopped down to match it aperture wise.
05-18-2011, 05:34 PM   #18
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I guess the other plus to the screw mount Pentax 500 f4.5 is that on my K10D is it would perform like it was 750mm.

Last edited by jjbuzard; 05-18-2011 at 05:46 PM.
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