weird Sigma 12-24 f4.5-5.6 DG behavior with 7d and other bodies , help

Started Jan 20, 2013 | Discussions thread
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mantra
mantra OP Contributing Member • Posts: 773
Re: weird Sigma 12-24 f4.5-5.6 DG behavior with 7d and other bodies , help

KentG wrote:

One reason why Sigma, unlike the companies that buy a license (Tamron and Tokina), builds pro lenses over 300/2.8. The others are prevented by their license agreements (although in the case of Tokina and Nikon, because Tokina builds most of Nikon's long pro primes in their facility, they are doubly prevented from competing with Nikon in that area).

Kent Gittings

Thanks Kent

so tokina and tamron bought license from canon to work with canon bodies ,are you sure?

i did not know it

by the way i would like to know if the photos i taken with my sigma are soft or not , i mean if i have a bad copy

should i open a topic in sigma lenses ?

i don't want to appear to create spam

thanks again Kent , you gave me good imputs

ps i did not find a available firmware or the advise to updagrade the chip for  this lens in th sigma homepage

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