Posts: 7,957
Threads: 1,832
Joined: Apr 2010
Reputation:
45
Chief Editor - opticallimits.com
Doing all things Canon, MFT, Sony and Fuji
Posts: 215
Threads: 5
Joined: Apr 2010
Reputation:
3
I think the sigma art is a better lens don't you ?
Posts: 4,031
Threads: 41
Joined: Feb 2013
Reputation:
22
Two sentences dragged my attention:
"The (optical) behaviour in backlit situations is better than average though."
I don't think, lens hoods can improve strictly backlit situations like shooting towards a light source. In German, one of the terms describing of this things is "stray light hood" - meaning light sources, not visible in the picture, but their light rays make their way into the front element and acting as ricochets inside the lens. For that, a dedicated lens hood can improve the picture - but not for backlight, here it's only the level of coatings.
"It is facing tough competition from the Sigma 85mm f/1.4 ART lens but the Canon lens has the benefit of providing more consistent focusing results."
For that I'd like to see some statistics, real facts. I suspect this to be a subjective opinion. Size and weight already are real disadvantages of the Sigma, but this fathom of focus inaccuracies keeps on running around and chain rattling and I never saw any clear evidence.
Especially from Opticallimits: More than once you said, AF is nothing we can test or rate.
Posts: 7,957
Threads: 1,832
Joined: Apr 2010
Reputation:
45
You are correct regarding "stray light".
You are not correct regarding the Sigma - RSAs.
Chief Editor - opticallimits.com
Doing all things Canon, MFT, Sony and Fuji
Posts: 7,957
Threads: 1,832
Joined: Apr 2010
Reputation:
45
(04-20-2018, 08:40 AM)JJ_SO Wrote: Whatever RSAs is... a rapper?

Focus shifts when stopping down.
Chief Editor - opticallimits.com
Doing all things Canon, MFT, Sony and Fuji
Posts: 7,957
Threads: 1,832
Joined: Apr 2010
Reputation:
45
... which is why I used the term focus accuracy ...
Chief Editor - opticallimits.com
Doing all things Canon, MFT, Sony and Fuji