[JJ_SO]

Clearly you never put AI-S lens on a D90 (their enthusiast model) or a budget 50/1.8D on a D40 (their budget model) or the new E series on something older than 6-7 years (Does not work).

True. Didn't want to waste money on old garbage. :lol: When I stumbled into Nikon grounds, their enthusiast model started with D7000 which was a big step forward from Pentax K-m/x/r or whatever.

 

Was not needed. My friend had the 50/1.4 ART and it was clear as day even on the rear LCD that the camera would front focus twice and back focus the next shot on a still target in good light. No need to even remove the SD card from the camera, it was useless.

 

Meaning it front focused in LiveView?  :blink: At first: One friend, one lens? You dare to conclude from the behaviour of this and another 35 mm to a whole brand? Courageous. And of course, the lens had the current firmware 1.03 (35 mm, the 50 still is at 1.00*).

 

"the internet is full of stories about...", yes it is, but how many of them are real lens failures and how many are just "some dude found the video record button and got himself a YouTube account"? 10 lenses of each brand, 100 shots per lens, then we're talking again.

 

I just put mine in front of the D810. With the 35 mm, no problem at all. With the 50 mm and AF-S: 2 front focus shots out of 9. With AF-C, nine shots perfectly focused. Sometimes it's the lack of photographers technique, not the lens' technique  And before you start counting how many gazillion shots both of you already took and all always in focus and only the Sigma.... please spare us the time. I know professional photographers being scared of using AF-C, scared of any ISO beyond 800. Professionals are sometimes really great to stick to misconceptions - and I understand that. If I once would find out which AF technique is 100% foolproof, I also would stick to it, but I'm still trying and erroring...

 

Sigma is no holy manufacturer in possession of a single truth, they have their error quote like Nikon or Canon. I just wanted to point out, that in terms of AF accuracy and especially reliability, the whole system is not only the lens.

 

*) most Sigma lenses for Nikon stick at 1.00 (20, 24, 50, 24-105). How boring  <_< no action on firmware front.