10-16-2015, 07:08 AM
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10-16-2015, 07:27 AM
Had the Sigma 20mm f1.8 a great lens (soft at f1.8 however) and I regret selling.
This one seemed to me the way to go until I saw the picture: Why this protruding front element ??? We need polarizers at 20mm, plus thr protruding front element on the Signa 14mm f2.8 created me tremedeous problems, disppointed...
10-16-2015, 07:27 AM
Quote: Oh no! I was thinking of this as my first Sigma lens ever. Might wait for some real world shots before I decide.
10-16-2015, 08:04 AM
The MTF is at f1.4. So, pretty good, considering. It will no doubt perform pretty well closed down a bit. Heavy beast, though.
I can't imagine having a bag full of top primes, nowadays... Sigma 20mm f1.4, Zeiss Otus 28mm f1,4, Canon 35mm f1,4 II, Zeiss 50mm f1.4 Milvus, Canon 85mm f1.2, what a heavy bag that is going to be! 
10-16-2015, 08:09 AM
Klaus might have a different definition of "hot" than you have, Andrew. ^_^ Like you, I also wait for some real world shots. But think about: The real advantages for this lens are speed and possibly more resistance against flare. Otherwise our 14-24/2.8 is much more versatile and not much heavier.
And the downsides? Weight, price (compared to the Nikkor AF-S 20/1.8 G ED N) and Klaus' "not hot" MTF - at least it's not hotter than the one of the Nikon sample, see https://photographylife.com/lenses/nikon...m-f1-8g-ed For comparison, here's the hotter Zeiss: https://photographylife.com/lenses/zeiss...-21mm-f2-8
10-16-2015, 08:18 AM
Quote:The MTF is at f1.4. So, pretty good, considering. It will no doubt perform pretty well closed down a bit. Heavy beast, though.Exactly, it seems that the days of those neat little primes that you just popped in compact camera bag are disappearing fast (except for me of course  ) For these new lenses powered golfing carts will be the order of the day! Please note my latest photographic accessory: A Ghillie Suit for birding. I dare not use it here till the shooting season is over!
10-16-2015, 08:23 AM
Quote:Had the Sigma 20mm f1.8 a great lens (soft at f1.8 however) and I regret selling."Great lens but soft at f1.8" - well, to me it killed any appeal of this lens; what's the point in having a f/1.8 lens if you have to use it at f/4 or so... I'm also a user of Sigma 14/2.8 and while the bulbous front element is inconvenient, it's not a deal breaker in my opinion. The 20/1.4 has a much less curved glass in front it seems, more similar to a Canon 15/2.8 fisheye of yore. By the way, on a Sigma 14/2.8 you can also use gel filters in a pinch - though I never bothered to try them.
10-16-2015, 11:22 AM
Quote:"Great lens but soft at f1.8" - well, to me it killed any appeal of this lens; what's the point in having a f/1.8 lens if you have to use it at f/4 or so...You don't have to... f2.2: https://www.flickr.com/photos/[email protected]/sizes/o/ f2: https://www.flickr.com/photos/[email protected]/sizes/o/ f1.8: https://www.flickr.com/photos/[email protected]/sizes/o/ f1.8: https://www.flickr.com/photos/[email protected]/sizes/o/ f1.8: https://www.flickr.com/photos/[email protected]/sizes/o/ f1.8: https://www.flickr.com/photos/[email protected]/sizes/o/ In my opinion, a lens with an undeservedly bad reputation.
10-16-2015, 11:47 AM
Quote:This one seemed to me the way to go until I saw the picture: Why this protruding front element ??? We need polarizers at 20mm, plus thr protruding front element on the Signa 14mm f2.8 created me tremedeous problems, disppointed...Polarisers at such wide angles? Even at 24mm there is usually a very obvious sky gradient effect when used outdoors, unless there are other applications where this isn't a problem? Quote:The MTF is at f1.4. So, pretty good, considering. It will no doubt perform pretty well closed down a bit. Heavy beast, though.Suppose the question is, how good is it compared to its nearest rivals? Not something that shows up on MTF, but I'm more interested in their claim of low coma far above absolute resolution (night usage). Anyone know how to correctly convert the illumination chart to stops? Is it a 2x or sqrt(2) factor per stop? Quote:"Great lens but soft at f1.8" - well, to me it killed any appeal of this lens; what's the point in having a f/1.8 lens if you have to use it at f/4 or so...Generally a stopped down lens will be better than a wide open one. So using a f/4 lens at f/4 will generally not be as good as a f/1.8 lens at f/4. Of course it varies with the specific lenses you compare, and the values may be different.
<a class="bbc_url" href="http://snowporing.deviantart.com/">dA</a> Canon 7D2, 7D, 5D2, 600D, 450D, 300D IR modified, 1D, EF-S 10-18, 15-85, EF 35/2, 85/1.8, 135/2, 70-300L, 100-400L, MP-E65, Zeiss 2/50, Sigma 150 macro, 120-300/2.8, Samyang 8mm fisheye, Olympus E-P1, Panasonic 20/1.7, Sony HX9V, Fuji X100.
10-16-2015, 01:49 PM
The sensor itself will lose again more light in the corners, so not sure how interesting it is to "correctly" convert the illumination chart.
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