wide angle for a 7d (1.6x crop sensor)

Jackwow said:
DemiLion if you were saying that the 7D doesn't have vignetting correction in camera then you are mistaken. It's a menu option.
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Really? Where?

As for the 10-22 vignetting at 10mm - Ive used this lens on a 40D, 50D and a 7D (without the 'vignetting correction' turned on). Never have I seen any vignetting and I can't believe that variation in manufacture could cause it. It's much, much more likely that it's been caused by using so-called 'protective' filters.
 
but you don't always shoot with a large DOF like wise with portrait you don't shoot wide open (particularly in the studio).

fact still remains that the 10-22 has vignetting like all other wide angle lenses because of physics, cos4 law of illumination fall of, nothing you can do about it unless they make a rectilinear 10-22 for 135 frames where you'll get reduced fall off because you are only using the centre of the lens

mipevo6 said:
Because you are typically using a wide angle for landscape where a large DOF is desirable hence stopping down to F8 and beyond..

This is very different to a portrait or wildlife shot where you are trying to isolate your subject.....
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mipevo6 said:
Why would you use a wild angle wide open? Mine is typically used at F8 and beyond...
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Why? At 10mm is the difference in DOF at f8 so hugely different from f4?

Edit: at the answer is no. With the subject at 10m the DOF is 0.6m to infinity at f8 and 1.2m to infinity at f4.
 
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POAH said:
but you don't always shoot with a large DOF like wise with portrait you don't shoot wide open (particularly in the studio).

fact still remains that the 10-22 has vignetting like all other wide angle lenses because of physics, cos4 law of illumination fall of, nothing you can do about it unless they make a rectilinear 10-22 for 135 frames where you'll get reduced fall off because you are only using the centre of the lens
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TBH, I can't think why I would be shooting at 10mm at f4 unless its maybe some kind of shot looking for distortion and a narrow DOF which kinda negates the wide effect?

However,

I agree its likely we will see light fall off in the corners at that setting... I just think most folks never shoot at that combination so never see it..

Any zoom in or step down will dramatically cut down any vignette effect...
 
still vignettes though according to photozone 1/2 stop which depending on the scene can be significant.

Don't get me wrong I'm not knocking the lens I had one when I used a 40D but to say it does not vignette is a lie.

mipevo6 said:
Any zoom in or step down will dramatically cut down any vignette effect...
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POAH said:
still vignettes though according to photozone 1/2 stop which depending on the scene can be significant.

Don't get me wrong I'm not knocking the lens I had one when I used a 40D but to say it does not vignette is a lie.
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I think we are agreeing with each other..:thinking:

TBH Lightroom or PS with lens profiles can correct it perfectly anyway...
 
mipevo6 said:
Because you are typically using a wide angle for landscape where a large DOF is desirable hence stopping down to F8 and beyond..

This is very different to a portrait or wildlife shot where you are trying to isolate your subject.....
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Speak for yourself. I use mine for crowd shots.
 
POAH said:
still vignettes though according to photozone 1/2 stop which depending on the scene can be significant.

Don't get me wrong I'm not knocking the lens I had one when I used a 40D but to say it does not vignette is a lie.
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Their perfectionist and over analytical lab tests might show that, but I still can't see it in my photos!
 
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I've got a Tokina 11-16 available in the sales section of this forum. Been very pleased with the purchase a year ago and has served me well.

I find the Tokina to be excellent. Though does vigenette at if using a polarizer and a Lee filter holder, but otherwise I find it excellent lens and so well built.


Would loved to of tried the Canon UWA for crop sensor, but I am going full frame now and can't wait!
 
mipevo6 said:
I always think people look weird shot on a wide....

Got any examples?
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I use it often on people, sometimes at 10mm for effect, and sometimes at 22mm which is ideal for portraiture. Crowd shots do look excellent shot with a UWA!
 
I thought low f/numbers were about low light and controlling exposure, as well as depth of field?

All lenses have at least some vignetting, and with wide angles, and very low f/numbers, it is often quite intrusive. I think manufacturers don't try too hard to correct it optically these days, as it is so easy to do in post processing (Canon's DPP has an auto-correct function) or in camera, and it is advantageous to the design in other ways not to bother.
 
hollis_f said:
Really? Where?
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It's the first menu tab and the sixth menu item and it's called 'Peripheral illumin. correct.'

"Peripheral Illumination Correction is a feature that's actually a lot simpler that it initially sounds. Basically it corrects the unwanted effects of vignetting, typically seen in wide-angle photos in the corners of the frame. The 7D contains a database of correction data for various Canon lenses and, if Peripheral Illumination Correction is enabled, automatically applies it to JPEG images. For RAW images the correction is applied later in the Digital Photo Professional software. Up to 40 lenses can be programmed into the 7D, with over 80 currently available to choose from. Peripheral Illumination Correction is a useful and effective addition, particularly for JPEG shooters, and can safely be left turned on all of the time."
 
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