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Old Oct 18, 2006, 4:39 AM   #1
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Could anyone provide me with the MTF figures for the following lenses(all at F8):

- Sigma 17-35mm at its sharpest focal length
- Sigma 28mm 1.8
- Sigma 24mm 1.8

Thanks in advance.

Btw, I've already tried photozone.
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Old Oct 18, 2006, 6:00 AM   #2
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FYI - http://www.photodo.com/topic_17.html

BTW I have this 17-35 Sigma EX and do shoot it wide open f/2.8 at dawn (to freeze the ocean waves):






PS: The Sigma 15-30mm EX is actually a much better performer (alas no HSM though)
--> Do try it out... as to other 20mm f/1.8 prime: http://www.pbase.com/lightrules/3z1p
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Old Oct 18, 2006, 6:17 AM   #3
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Thanks NHL

I'm actually compiling a rating system for all the lenses of which MTF scores are quite integral (I blame been an analyst). Those specific 3 lenses were the ones I never had any details on.

Interestingly, according to my scoring model, the Tamron 17-35 rates the highest, whilst the Canon 17-40 rates the lowest(Out of 10 Lenses!)
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Old Oct 18, 2006, 6:48 AM   #4
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The MTF does not take into account construction and weather sealing...
-> Both strong point on the L's
If you only analyze for optical performance/price then I can definetly see the weighting toward the 3rd parties :idea:
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Old Oct 18, 2006, 7:54 AM   #5
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I'm looking at the following points:
-Price
-MTF Performance
-Flexibility
-Max Aperture
-Special Features (I.E. close focusing, super wide, IS, weather sealing)
-Brand-this one is not to important, but it does mean the lens should always be compatible and there is the supposed quality control issue on 3rd party lenses.

Based on those points I get the following list:
1. Tamron 17-35
2. Sigma 28 1.8
3. Sigma 15-30
4. Sigma 24 1.8
5. Sigma 17-35
6. Canon 28 2.8
7. Canon 16-35 2.8
8. Canon 24 2.8
9. Canon 17-40L
10. Sigma 12-24

What I haven't scored, and probably should have, is if the front element of the lens sticks out the front. For landscape photography, the use of filters is crucial, therefore a front element that sticks out wouldn't be that practical.
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Old Oct 18, 2006, 9:11 AM   #6
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FYI - I've also have the Sigma 12-24mm...
It may be last on anyone list, and its MTF would be problematic as well for anything this wide; However, there's nothing quite like it for a full-frame (even compared against all Canon primes in this super wide range)
-> It's actually my favorite lens!!! :idea:
http://www.stevesforums.com/forums/v...amp;forum_id=8

BTW this 12-24mm lens comes with an adapter for front-filter (but will vignette beyond 17mm) - and another example of what you can capture of what's on top and below at the same time (and with a front polarizer):


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Old Oct 19, 2006, 1:37 PM   #7
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JohnReid wrote:
Quote:
I'm looking at the following points:
-Price
-MTF Performance
-Flexibility
-Max Aperture
-Special Features (I.E. close focusing, super wide, IS, weather sealing)
-Brand-this one is not to important, but it does mean the lens should always be compatible and there is the supposed quality control issue on 3rd party lenses.

Based on those points I get the following list:
1. Tamron 17-35
2. Sigma 28 1.8
3. Sigma 15-30
4. Sigma 24 1.8
5. Sigma 17-35
6. Canon 28 2.8
7. Canon 16-35 2.8
8. Canon 24 2.8
9. Canon 17-40L
10. Sigma 12-24

What I haven't scored, and probably should have, is if the front element of the lens sticks out the front. For landscape photography, the use of filters is crucial, therefore a front element that sticks out wouldn't be that practical.
A wide angle zoom is on my Christmas shopping list...:-)

I am choosing from these lenses based on MTF, cost and overall performance on my 30D:

Canon 10-22mm, Sigma 12-24mm and Tokina 12-24mm.

Whatis your recommendation based on your research..:?
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Old Oct 19, 2006, 1:57 PM   #8
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Hi

If you have any plans to go FF, of the three lenses i would pick Sigma 12-24. Excellent built, HSM and a relatively good performance.

In case of cropped sensor(1.3 or 1.6) i would advice tokina. is much sharper compared to the other two and built is great with a good warranty package.

Bear in mind that the pictures are coming from a wide angle lens and "WILL NOT" be razor sharp as from a 17mm zoom. May match at 17mm. But at 10, 12 mm there will be Vignetting as well as border softness. Even centre is somewhat soft.

Even with a tripo at 12mm with proper light i am not sure you will get a good image to print big posters.

Vj


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Old Oct 20, 2006, 5:08 AM   #9
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JohnReid wrote:
Quote:
Could anyone provide me with the MTF figures for the following lenses(all at F8):

- Sigma 17-35mm at its sharpest focal length
- Sigma 28mm 1.8
- Sigma 24mm 1.8

Thanks in advance.

Btw, I've already tried photozone.

John,

I don't know if this is of any help, but I discovered you can find out the MTFs of Sigma lenses this way....

Use this link: http://www.sigma-imaging-uk.com/lenses/mtfcharts/and either click the lenses you want to find the MTF of (you'll need to know the focal lengths), it's quite easy / intuative.

Hope this is helpful! I basically discovered / deduced this by accident from a link that photodo had on their website directly to Sigma's UK website.

Paul
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Old Oct 20, 2006, 5:32 AM   #10
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Thanks for the link Paul, I'll definately be checking it out.

Regarding the Wide Angle question, I limited my research to WA that will work on a full frame camera. Ultimately I think most DSLRs are going to move that way so IMO the Sigma 12-24 is your best bet.

Even if you don't go full frame in the near future, the fact that your 1.6 crop will not use the edges of the lens should result in you getting quite a decent picture.
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