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Sigma 30mm f1.4 vs. Canon 28mm f2.8

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Thread started 24 Sep 2005 (Saturday) 11:03   
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Henrik ­ Ploug
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Here are some test shots from the Sigma 30mm f1,4 and the Canon 28mm f2,8. None of the shots have been sharpened in camera or in Photoshop.


The Sigma is sharper in the center and the Canon is sharper in the corner, when compared at equal apartures.
The center sharpness of the Sigma at f1,4 can be compared with the center sharpness of the Canon at f4. The corner sharpness of the Canon at f4 can be compared to the Sigma at 5,6.

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Post #1, Sep 24, 2005 11:03:15




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Henrik ­ Ploug
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Sigma 30mm f1,4 vs. Canon f2,8

Here are some test shots from the Sigma 30mm f1,4 and the Canon 28mm f2,8. None of the shots have been sharpened in camera or in Photoshop.


The Sigma is sharper in the center and the Canon is sharper in the corner, when compared at equal apartures.

The center sharpness of the Sigma at f1,4 can be compared with the center sharpness of the Canon at f4. The corner sharpness of the Canon at f4 can be compared to the Sigma at 5,6.

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Post #2, Sep 24, 2005 12:57:14




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Lenny_D
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Really interesting.... What do you think, is the large change in sharpness across the diameter of the Sigma lens disturbing in real life photography? Is the 1.5 stop worth the unbalance in sharpness?
Obviously the Canon gives a more balanced picture (regarding sharpness).
Any other differences, e.g. contrast, clarity?
I'm still looking for the best "standard"' prime on a 20D.

Lenny

Post #3, Sep 24, 2005 15:27:58 as a reply to Henrik Ploug's post 2 hours earlier.




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Henrik ­ Ploug
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I have just done the test today, and I haven't noticed the soft edges before now. After I noticed, I have now expanded the test, so that it also includes edge crops:

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Post #4, Sep 24, 2005 15:53:33 as a reply to Henrik Ploug's post 2 hours earlier.




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Henrik ­ Ploug
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At the edge both lenses seem quite sharp, and I think I will keep the Sigma and sell the Canon. Just have to avoid getting the motif stuck in the corner.

Post #5, Sep 24, 2005 15:57:07 as a reply to Henrik Ploug's post 2 hours earlier.




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Hellashot
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The Sigma 30mm f1.4 DC is known to be a very sharp lens at f1.4, a lot sharper than Canon's f1.4 50mm.

Post #6, Sep 24, 2005 19:09:39


5D, Drebel, EOS-3, K1000
lenses from 12mm-500mm

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grego
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That's the 28 f/2.8, not 50.

Post #7, Sep 24, 2005 19:41:10


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Hellashot
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grego wrote:
That's the 28 f/2.8, not 50.

Yes, what I stated is what I wanted to say. :)

Post #8, Sep 24, 2005 19:49:45 as a reply to grego's post 8 minutes earlier.


5D, Drebel, EOS-3, K1000
lenses from 12mm-500mm

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grego
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Hellashot wrote:
Yes, what I stated is what I wanted to say. :)

I gotcha. I do have to say the 50 1.4 is one of the sharpest lens out there. And it not being an L, makes it even better of a deal. Although I haven't seen a side by side comparision of the 50 vrs 30 1.4's.

Post #9, Sep 24, 2005 20:36:50 as a reply to Hellashot's post 47 minutes earlier.


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Henrik ­ Ploug
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Just added some extra shots from the edges and the top left corner. My conclusion:

The Sigma 30mm f1,4 is sharpest in the center.
The Canon 28mm f2,8 is sharpest in the corner.
The two lenses are just about equal at the edges.

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Post #10, Sep 25, 2005 04:17:26




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pfogle
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Nice example - the Sigma looks good compared to the 28/2.8 - though to be honest, I'm selling the EF28/2.8 because it's just not a great lens.

Has anyone compared the Sigma to the EF 28/1.8 - also not known as a great lens, but much more interesting to me than the f2.8 version.

thanks
Phil

Post #11, Sep 25, 2005 07:14:20


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Phil Fogle
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drisley
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If you get a good copy of the 28/1.8, it's an amazing lens.
The build and autofocus (speed and silence) are both fantastic.
I had a great copy that I sold to RichardTheSane, and he will vouch for it's optical quality.

Post #12, Sep 25, 2005 07:26:38


http://photography-on-the.net/forum/showthre​ad.php?t=680947

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Andy_T
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That might have something to do with the Sigma being a DG lens (for reduced image circle) versus the Canon being a lens for full frame ... so you don't really see the edges of the Canon lens on an image from a 1.6 crop camera.

f/1.4 vs. f/4.0 is a difference of 3 full stops, btw. (that means 8 times the light gets in at the same time)
Full stops are 1.0 - 1.4 - 2.0 - 2.8 - 4.0 - 5.6 - 8.0 ...
Maybe not so important for landscapes, where you'd stop down anyway, but quite important if you want to isolate your subject.

Best regards,
Andy

Post #13, Sep 25, 2005 07:56:19 as a reply to Henrik Ploug's post 18 hours earlier.


some cameras, some lenses,
and still a lot of things to learn...
(so post processing examples on my images are welcome :D)
If you like the forum, vote for it where it really counts!
CLICK here for the EOS FAQ
CLICK here for the Post Processing FAQ
CLICK here to understand a bit more about BOKEH

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pfogle
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thanks, dr - by the way, do you know what the odds are on a 'good copy'? I'd put Sigma's at about 1 in 4 being good for the wides, but Canon I have no idea about. I haven't had a 'bad' Canon yet, but you do hear about them, especially with the 28/1.8 and the 20/2.8 for some reason.

Phil

Post #14, Sep 25, 2005 08:03:28


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Phil Fogle
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Wavy ­ C
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Tnx for posting these test results Henrik. Very well laid out and makes it easy to compare.

Post #15, Sep 25, 2005 08:20:08 as a reply to Henrik Ploug's post 19 hours earlier.



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