zhangyue
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 Re: Pre-order: Sigma 24mm f/3.5, 35mm f/2 and 65mm f/2 DG DN lenses | |
goldb wrote:
zhangyue wrote:
Dave Sanders wrote:
goldb wrote:
RustyBug wrote:
JVan_02 wrote:
The 45's AF-C issues stem from the huge amounts of uncorrected SA, most likely. The association between SA and problems with phase detect isn't exactly new. The article in question was written with DSLRs in mind, and I don't know exactly how that difference affects focusing with regards to SA. But the fact that this lens works better with contrast detect focus makes it more likely to me that SA is the culprit, as this is pretty common.
Well corrected 1:4 would be a different price point.
Bear in mind, too ... Sigma's building to the L Alliance. How many of those cameras are phase detect vs. contrast detect?
Makes me wonder if those experiencing the poor performance are doing so because of the diff's in match vs. mis-match.
I actually have been considering this lens ... now that I've come to realize how close it focuses, that's a plus one for me. I don't shoot AF-C, so that's no biggie for me. And, I'd be mounting it on a contrast detect body. So, those three points make it more viable for me.
Some chasing the kids around the room with it on a Sony, maybe it's not for them. Probably better off to buy the Sony lens designed for the Sony camera. 
Reviews / images I've seen say the poor correction extends out to about 2 feet away - not just at MFD. 2 feet away on a 45mm is not all that close... If you like the soft look - then go for it. But its not just a normal instance of "slightly soft at MFD."
I posted some selfies on the 45mm thread with crops to show eyelash detail. So, we're talking arm's length, a few feet. It's sharp at f/2.8, razor sharp at f/4. Criticisms of the 45's sharpness profile typically come from people who haven't used it in the real world. It's a fantastic lens with very sensible optical compromises. It renders beautifully at f/2.8 where you would use it, in the portrait range. The SA goes away and it's sharp as a razor at f/4 at any distance...I'm likely at least at f/4 or f/5.6 for DOF if I'm focussing closely, flowers or food, for example. At infinity, it's a fantastically sharp lens, corner to corner, at any landscape aperture.
Sigma made something unique, a break from the cookie-cutter optical designs that everybody has been pumping out. It's 'different', that's why it's got such a strong following among those of us who have used it. It's not for everyone, but its strong character is appealing enough many hoped that Sigma would apply it to other focal lengths in the line. They appear to have gone with a different set of equally sensible compromises. More people will likely be able to wrap their head around the performance of something like the 35/2 and I think it renders very nicely. Not 45 nice, but nice.
+1 on sharpness WO.
The reputation get ruined because Sigma give this lens half macro capability. It is glow at MACRO distance. For even half body shot, this lens is plenty sharp, SA is only a trace for keen eyes to see at that distance and with distance increase, it is totally disappear.
I'm curious what you would say regarding the picture above (of the young boy). Perfect example of a half body shot from probably 2-3 feet away? Personally its a good example of a lovely shot that would be, for me at least, one where I'd go "ugh, if only this were sharper." Hard to say without seeing the raw obviously, but in a browser at least, its a good example of a shot I wouldn't be happy with because of the softness.
I can't judge sharpness in above beautiful sample at this size. Maybe it was not fully in focus, but it is not the one deliever to client or for winning some contest. I wouldn't know. It certainly doesnt prevent me appreciate such fine portrait. It seems does all the job I want for my family images (capture a subtle moment, preserve a good memo) if I am the shooter, Id be very happy to present it as well.
However, i can supply some samples later to show that it is sharp enough for most cases if not macro distance at WO. It will not win bench contest but I have other lenses for that task. What is the expectation you have for a lens at 225g with excellent build and beautiful rendering and have a AF? Many people seems get its limitation and still happy with it, and some will move on if the requirement was different. Just saying.
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