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Wednesday, 22 February 2017

Comments

Clearly the ART lenses have been a big hit for Sigma, and more power to 'em.

On another note, personally I don't "get" this current preoccupation (or is it an obsession?) with "superfast" lenses. I think a lot of it is fanatical internet photo forum geek-driven obsession with millimeter-levels of DOF and "bokeh". "Oh, oh, I need it 'cause I shoot EVERYTHING wide open!". Gimme a break. The vast majority of lens performance, even the outstanding ones like Sigma has been producing lately, are typically sub-optimal "wide open".

I come from the days when an f/2.8 was regarded a "fast lens" and still think so today. For example, I like f/4 lenses; some of the best lenses I've ever used had a maximum aperture of f/4. I've found them to be smaller, lighter, more compact, less expensive and often, optically superior to their f/2.8 counterparts. Need more light? Put it on a tripod for a longer expsoure. I guess I'm just too "old-school" [grin].

It's not just about lens speed or sharpness. I'll take a really well-designed lens with that can deliver accurate color, acutance, can minimize focus breathing, and focus shift and field curvature at different apertures over a super fast lens any day of the week.

[You say you don't get it, then you explain it. Sounds more like you DO get it. :-) --Mike]

Why not with Sony E-mount?

But doesn't spherical aberration sometimes make for the best bokeh ?
http://bokehtests.com/styled/index.html

I have adapted an old Astro Kino projection lens with more aberrations than I know how to describe, but it does make for lovely bokeh sometimes...
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Mike:

I've currently got the Sigma Art f2.8 trio for micro 4/3 & e mount (19, 30 & 60) and use them on a Sony A6000. As I've said before, they match the camera so well that one suspects designers from the two companies getting together over a beer and doing a bit of friendly collaboration. The lens' optical characteristics are excellent - not just 'for the price,' but excellent. Speed is not an issue for me - I rarely shoot wide open. With this combination of camera and a carefully chosen lens, then Camera Raw>Silver Efex>Epson P800 ABW mode onto Ilford Gold Fiber Silk and I am one happy guy.

Steve

It will be interesting to see how it compares in performance and price with Canon's own 135mm f/2 which is half the weight and only 0.2 of a stop slower.

I will be looking at 24-70. If it is as heavy as the other ART lenses, this would be a killer for me as a hiking landscapists. Equally important will be the color rendition: In my APS-C time I had Sigma 10-20, but something was different to Nikkors, and visible on prints. We shall see,

That 14mm is colossal. So I suspect this will translate in sales to those who want it mainly for astrophotography, although this assumes it will perform well enough for this purpose. Personally I would have been much more interested in a great performing, small, 14mm f4.

I tend to regard these new, large, ultrafast lenses as a kind of youthful obsession (oneupmanship?) that one grows out of after about 10 years of amateur photography. They have their uses, but I believe they are not as important as many of their buyers think.

I, like most people who have used it, love the Panasonic 12-35mm f/2.8 zoom. You could take the rest of my lenses away and I would still be happy. But....I would love for them to make the same zoom but as an f/4. For travel, the weight saving would be a godsend and I read often that the f/4 versions of a lot of lenses outperform their faster brethren (sistern?) I rarely shoot at f/2.8, preferring f/5.6 as optimal.

> Interestingly, Sigma claims it has been specifically optimized
> for better bokeh, with "minimal spherical aberration."


A translation that better communicates the meaning of the original Japanese text

"球面収差をわずかに残すことでボケの描写にもこだわりました"

in the 24-70mm's product page on Sigma's Japanese web site would be e.g.

"The quality of the bokeh has been carefully tuned by leaving a trace amount of spherical aberration."

Yes, Sigma is on fire with it's Art series. I now have 5 of them - the last five lenses I have purchased. My latest set was the APS-C zooms. The 16-50 and 50-150 F1.8 with a constant aperture over the zoom ranges. Unreal, don't think anyone has ever done that before.

I'm a big fan and will be carefully looking at the 24-70 to possibly replace my Nikon 24-70. If Sigma keeps at this I could see my entire line of Nikon lenses being completely replaced over the next 3-5 years with Sigma Art lenses. If they produce a 15 or 16mm fisheye Art lense that would be great as Nikon still shows no signs of replacing it's 16mm FE introduced over 16 years ago if I remember correctly.

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