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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 14 Dec 2011 (Wednesday) 11:01
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Does the Canon 28 1.8 compare to the 85 1.8?

 
Quizzical_Squirrel
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Dec 14, 2011 18:04 |  #16

botw wrote in post #13545481 (external link)
The 28 is really nice on full-frame by f2.0. It also is compact and focuses quickly. You don't need to buy an L because you are using a full-frame camera.

I bow to your superior knowledge; I know nothing of full-frame.

In that case, I almost certainly made a bad decision!




  
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thatkatmat
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Dec 14, 2011 18:16 |  #17

YankeeMom wrote in post #13543799 (external link)
Like many, I am wavering between the Sigma 30 1.4 and Canon 28 1.8. There seems to be many pluses and minuses for each, but for me it comes down to image quality. I am comparing it to the other great lens I have -- the 85 1.8. I, specifically, want to know how the Canon 28 1.8 compares in image quality to the 85?? I need a wide prime for portraits and it has be pretty close to my work-horse. Thanks for any feedback! :)

I like the Canon better than the Sigma, I prefer a shorter Minimum Focal Distance on a wide fast prime. The Sigma is f/1.4 but both my 28/1.8's were nice and sharp wide open. Whomever said the Sigma build is better is....wrong IMHO, they both feel pretty solid.

In the end yes, the 28 has the same build, AF, and overall feel as the 85.

The Sigma is decent, but I'd say the worst of the 3 Sigma 1.4 primes ...30/50/85

28mm wide open

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Quizzical_Squirrel
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Dec 14, 2011 18:16 |  #18

Ok, don't rub it in!




  
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randy98mtu
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Dec 14, 2011 19:35 |  #19

Here is a sample from the 28 I had. This was at f/2.0. I thought it was very sharp!

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YankeeMom
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Dec 14, 2011 21:57 |  #20

Hmmm . . . great info -- and those samples look promising! I'm spoiled by my 85 (and even my 50 1.8), but even it can struggle wide open and the CA is shudder-worthy at times.


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Dec 15, 2011 01:45 |  #21

twoshadows wrote in post #13544774 (external link)
The 28 compares favorably to the 85 in terms of build (nearly identical) and AF accuracy. AF speed is slightly slower (but still faster than the Sigma)

I don't have the Canon 28, but I just tested my Sigma 30 and compaired AF speed to some of my other lenses. The Sigma is indistinguishable in AF speed on my 7D in servo from my 85/1.8 and 24-105. It is just barely noticeably faster than my 70-200/4 IS. So your statement in part contradicts my reality.

As far as AF accuracy I do see a noticeable drop in accuracy with the Sigma when I am in light that requires f2 or faster and ISO 3200 or faster. That is some pretty horrible lighting however and if I need to shoot in those conditions, i am grabbing the 430ex and the AF assist brings AF accuracy back up. At the same settings with out flash assist when using my 85/1.8, I get a better AF accuracy rate but even that lens is loosing some accuracy compared to what it can do in good light.


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Dec 15, 2011 02:30 |  #22

If your sigma 30 focuses just as fast as your 85mm f/1.8, then you've either got a dud of an 85 or a very special Sigma ;) . S'ok though. If our realities were all the same, the art world would be very boring. :D


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YankeeMom
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Dec 15, 2011 11:00 |  #23

Chariot, is the picture quality/sharpness in the Sigma equal to the 85 1.8? I've only had Canon lenses, but would be willing to consider the Sigma, but if the 28 is as sharp as my 85, not sure.


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Dec 15, 2011 13:25 |  #24

botw wrote in post #13544350 (external link)
The Sigma won't mount to my 5d2 :)

Yes it will. All Sigma DC lenses will mount on Canon full frame cameras. You will get some pretty serious vignetting, though.


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Dec 15, 2011 13:29 |  #25

Sigma 30mm on my 20D....Forgot to mention...The Sigma has way smoother bokeh than the 28

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YankeeMom
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Dec 15, 2011 16:37 |  #26

The thing that worries me the most about the Sigma is that I've read reviews on Amazon and a lot of people say that they have to have their cameras adjusted with the lens for it to work at its best. I don't have a camera shop anywhere near me, so that would be a big hassle.


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bpark42
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Dec 15, 2011 16:56 |  #27

YankeeMom wrote in post #13549116 (external link)
Chariot, is the picture quality/sharpness in the Sigma equal to the 85 1.8? I've only had Canon lenses, but would be willing to consider the Sigma, but if the 28 is as sharp as my 85, not sure.

Either lens should have center sharpness that is good enough to be considered comparable to the 85, but outside the center zone they will not be able to match the 85. That is fairly typical for wide angle lenses though, even much more expensive options like the 35L.

As for picture/image quality being "equal to" the 85, that type of comparison is almost impossible since there are a large number of both subjective aesthetic elements as well as technical concerns that factor in to the final image quality.




  
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Dec 15, 2011 17:46 as a reply to  @ bpark42's post |  #28

For shooting sports, the 28's AF speed isn't quite as fast as the 85, but I've shot youth basketball games with the 28 and cropped to get closeups with no big loss of IQ (of course, any crop loses some quality).

I just today bought the 50/1.8 and will use it tonight at a game.


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FEChariot
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Dec 15, 2011 20:34 |  #29

YankeeMom wrote in post #13549116 (external link)
Chariot, is the picture quality/sharpness in the Sigma equal to the 85 1.8? I've only had Canon lenses, but would be willing to consider the Sigma, but if the 28 is as sharp as my 85, not sure.

I would say in good light (iso 1600 or less type of situations),
the Sigma is sharper in the center at all apertures. The 85 is sharper in the corners in all situations. The IQ falloff of the Sigma starts becoming noticeable just outside of the rule of thirds area. From what I have heard, the Canon 28 suffers lower IQ in the corners as bad or worse.

In low light, and by low light I mean ISO 3200 and f2 type of lighting, the image quality of the sigma starts to fall behind the 85/1.8 but I think that is a function of AF accuracy. Remember that no prime can turn bad light into good light, fast primes just have the ability to let in more bad light so having directional or off camera flash at least as a back up will do your pictures wonders.

What others have said about the Sigma having a yellow cast is true. I find this to be a non Issue because I shoot RAW. A five second adjustment of the white balance and a little extra vibrance boost in PSE elements and the color is corrected to that of my Canon Glass. If you are a jpeg only shooter, you may want to stick with Canon.


Canon 7D/350D, Σ17-50/2.8 OS, 18-55IS, 24-105/4 L IS, Σ30/1.4 EX, 50/1.8, C50/1.4, 55-250IS, 60/2.8, 70-200/4 L IS, 85/1.8, 100/2.8 IS L, 135/2 L 580EX II, 430EX II * 2, 270EX II.

  
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tkbslc
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Dec 15, 2011 20:36 |  #30

For group portraits, there's really no need for a prime. Just use a good zoom stopped down to f8 for the required DOF and concentrate on lighting.

For individual portraits, I prefer 50 and 85mm to 28/30mm. I use my 30mm more as a "candid" lens in low light, but rarely for posed portraiture.


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Does the Canon 28 1.8 compare to the 85 1.8?
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