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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 17 Aug 2010 (Tuesday) 06:55
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300mm 2.8

 
minkynuts
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Aug 17, 2010 06:55 |  #1

At the moment I have a Sigma 120-300 2.8 I have just bought a canon 300 2.8 and have just tested them side by side and to me it seems the Canon image is larger than the sigma at 300mm but the sigma seems sharper.

Rob




  
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newworld666
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Aug 17, 2010 08:34 |  #2

:rolleyes: sharper ? it will be interesting to see your tests


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Invertalon
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Aug 17, 2010 08:34 |  #3

Hmm.. What do you mean by "larger?" If you mean it does not seem to have as much reach as the 120-300 that is very possible. Focal lengths are usually rounded numbers, so the 120-300 may actually be a 303.4mm and the canon may actually be a 297mm... They just use even numbers so it is easier.

Now I do have a hard time believing that the zoom is sharper than the canon prime... Maybe it needs microadjusted or something on your body. That canon is deadly sharp...

Have fun with your lenses!


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vmaidens
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Aug 17, 2010 08:43 |  #4

Yeah lets see some shots, I know the 120-300 is a sharp lens, but the 300 is a benchmark.


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Alex_Venom
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Aug 17, 2010 08:43 |  #5

Can you show us some examples?


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minkynuts
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Aug 17, 2010 13:02 as a reply to  @ Alex_Venom's post |  #6

Well here are two photos both taken on a tripod at 2.8, as you can see the canon brings the image closer than the sigma, I used a timed shot so as to stop camera shake
The sigma is the first photo and the canon the second.

Rob


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CyberDyneSystems
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Aug 17, 2010 13:12 |  #7

The Sigma is likely not as close to actual 300mm FL as claimed,. this happens a lot with Zooms,. a 75-300mm is usually more like 280mm or so..
The optical math is such that rarely are lens designs "spot on",. the tradition is to round off to the nearest "normal" FL.

Also, focus effects FL,. even if the two shots were taken from the same distance, the two optical designs can have different focus ranges, different MFD,. etc. So they may behave differently from each other at various working distances.

What Canon lens are we talking about by the way? The old Non IS?
Either way, if you find you have a SIGMA that is that sharp, I'd hold on to it!


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dpds68
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Aug 17, 2010 13:13 |  #8

Can you post your EXIF data ?


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Invertalon
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Aug 17, 2010 13:21 |  #9

Looks like the 300 2.8 could use a little microadjust. Looks to be front-focusing (based on tiles the jug is resting on).


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Anders ­ Östberg
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Aug 17, 2010 13:25 |  #10

Invertalon wrote in post #10738711 (external link)
Looks like the 300 2.8 could use a little microadjust. Looks to be front-focusing (based on tiles the jug is resting on).

I thought that was what I saw as well, the 300/2.8 (and/or the camera) may need a focus adjustment.


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minkynuts
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Aug 17, 2010 13:39 as a reply to  @ Anders Östberg's post |  #11

Here is the EXIF info


Frame #: 7972
Lens (mm): 300
ISO: 100
Aperture: 2.8
Shutter: 1/2000
Exp. Comp.: 0.0
Flash Comp.:
Program: Aperture Priority
Focus Mode: One Shot AF
White Bal.: Auto
ICC Profile: Adobe RGB (1998)
Contrast: 1
Sharpening:
Quality: Fine




  
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Invertalon
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Aug 17, 2010 13:51 |  #12

Did you take those with a tripod? At 300mm at f/2.8 your depth of field is pretty shallow. If you focus and wiggle just a little your focus will be thrown off. Place on a tripod and take test images that way.

If it still is off, your lens will need microadjusted.

The zoom should not be sharper than the Canon prime...


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minkynuts
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Aug 17, 2010 14:29 as a reply to  @ Invertalon's post |  #13

The canon with microadjustment, I think I can see a difference , but that may be wishful thinking

Rob


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minkynuts
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Aug 17, 2010 14:33 as a reply to  @ minkynuts's post |  #14

That was with +8 on the adjustment

Rob




  
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bobbyz
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Aug 17, 2010 15:10 |  #15

Sigma is not 300mm, based on the front element size, that's what I have heard.


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Canon 24mm TSE-II, 85mm f1.2 L II, 90mm TSE-II Macro, 300mm f2.8 IS I

  
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300mm 2.8
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