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+--- Thread: Sigma 20mm review coming ... (/showthread.php?tid=861)
Sigma 20mm review coming ... - Rainer - 03-20-2016
Quote:One aspect is surprising about this lens ...
Ehm .... you don't notice the weight?
;-)
Sigma 20mm review coming ... - Klaus - 03-20-2016
Quote:Ehm .... you don't notice the weight?
;-)
Optically ... ;-)
Sigma 20mm review coming ... - Rover - 03-21-2016
Quote:Optically ... ;-)Da boken?
Sigma 20mm review coming ... - JJ_SO - 03-21-2016
Da bokeh is fat, bro!
![[Image: pirat20x17.gif]](http://www.macinacs.de/smile/pirat20x17.gif)
Sigma 20mm review coming ... - Rover - 03-21-2016
True dat! (I guess a 20mm f/1.4 lens can have a pretty unique signature...)
Sigma 20mm review coming ... - JJ_SO - 03-21-2016
Yes, it can. Only trouble is, the camera's AF or whoever runs the focus-lever should do a very good job...
Sigma 20mm review coming ... - Rover - 03-21-2016
Some cool shots in that gallery (others not so much...) But in a pinch one can use LiveView 10x magnification, and in a really desperate case, focus manually. I know I've done that, despite being averse to MF...
Sigma 20mm review coming ... - JJ_SO - 03-21-2016
It's contradicting the intended use: any f/1.4 lens I own, I bought to be able taking pictures in dark places. If that means, I have to use LV and focus manually because PDAF cannot deliver the necessary accuracy then why bother about f/1.4 lenses in general? For fast wide angles it's much tougher to get a precise AND quick AF.
I already compared PDAF with CDAF on that lens, there's no single picture when PDAF was more precise although I did AFMA - what else can I do?. To do AFMA, you need to be really close at the target: 20 mm × 50 = 1 m distance, but what about infinity and what about those big AF points which leave me totally in uncertainty where this thing will focus?
Sigma 20mm review coming ... - Rover - 03-22-2016
Quote:It's contradicting the intended use: any f/1.4 lens I own, I bought to be able taking pictures in dark places. If that means, I have to use LV and focus manually because PDAF cannot deliver the necessary accuracy then why bother about f/1.4 lenses in general? For fast wide angles it's much tougher to get a precise AND quick AF.Your demands are elevated indeed. I know my 24/1.4 L is mediocre for AF accuracy in the dark unless I'm using it at point blank range (and even then...) Serves me right for trying to shoot distant subjects below f/2.
I already compared PDAF with CDAF on that lens, there's no single picture when PDAF was more precise although I did AFMA - what else can I do?. To do AFMA, you need to be really close at the target: 20 mm × 50 = 1 m distance, but what about infinity and what about those big AF points which leave me totally in uncertainty where this thing will focus?
The 16-35/4L IS is sometimes a better choice... despite being 3 stops slower, it seems to have a much greater hit rate. The shutter speed is the only concern in this case.Sigma 20mm review coming ... - soLong - 03-28-2016
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