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Old 24th of September 2005 (Sat)   #1
Henrik Ploug
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Default Sigma 30mm f1,4 vs. Canon 28mm 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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Old 24th of September 2005 (Sat)   #2
Henrik Ploug
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Default 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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Old 24th of September 2005 (Sat)   #3
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Default Re: Sigma 30mm f1,4 vs. Canon f2,8

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
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Old 24th of September 2005 (Sat)   #4
Henrik Ploug
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Default Re: Sigma 30mm f1,4 vs. Canon f2,8

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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Old 24th of September 2005 (Sat)   #5
Henrik Ploug
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Default Re: Sigma 30mm f1,4 vs. Canon f2,8

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.
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Old 24th of September 2005 (Sat)   #6
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Default Re: Sigma 30mm f1,4 vs. Canon 28mm f2,8

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.
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Old 24th of September 2005 (Sat)   #7
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Default Re: Sigma 30mm f1,4 vs. Canon 28mm f2,8

That's the 28 f/2.8, not 50.
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Old 24th of September 2005 (Sat)   #8
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Default Re: Sigma 30mm f1,4 vs. Canon 28mm f2,8

Quote:
Originally Posted by grego
That's the 28 f/2.8, not 50.
Yes, what I stated is what I wanted to say.
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Old 24th of September 2005 (Sat)   #9
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Default Re: Sigma 30mm f1,4 vs. Canon 28mm f2,8

Quote:
Originally Posted by Hellashot
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.
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Old 25th of September 2005 (Sun)   #10
Henrik Ploug
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Default Re: Sigma 30mm f1,4 vs. Canon 28mm f2,8

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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Old 25th of September 2005 (Sun)   #11
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Default Re: Sigma 30mm f1,4 vs. Canon 28mm f2,8

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
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Old 25th of September 2005 (Sun)   #12
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Default Re: Sigma 30mm f1,4 vs. Canon 28mm f2,8

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.
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Old 25th of September 2005 (Sun)   #13
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Default Re: Sigma 30mm f1,4 vs. Canon f2,8

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,
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Old 25th of September 2005 (Sun)   #14
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Default Re: Sigma 30mm f1,4 vs. Canon 28mm f2,8

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
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Old 25th of September 2005 (Sun)   #15
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Default Re: Sigma 30mm f1,4 vs. Canon f2,8

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