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Thread started 02 Apr 2007 (Monday) 16:49
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Sigma 12-24mm EX DG - Popeye

 
rdenney
Rick "who is not suited for any one title" Denney
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Jan 07, 2009 18:42 as a reply to  @ post 5691121 |  #61

Here's a sample from a 5D. Image made hand-held, 1/15 at f/5.6 (wide open at 12mm). The corners do go soft, but I don't think it undermines the image. The first image is the full frame, with miminal PP including sharpening. The second is a couple of 100% crops, one from the center and the other from the corner, with no sharpening.

The soft corners don't bother me at all, but the flare from the sliver of visible sky does a bit. This is one of the few images I've made where the flare was noticeable (and, no, I'm not talking about ghost reflections).

Given the settings and subject, this probably represents the worst-case performance with this lens. I can certainly live with it.

Unlike with my 10D, this isn't a walkaround lens on the 5D--it's too wide for that. But when you need it, nothing else will do, and the image quality is good enough such that you don't have to reserve it for the occasional novelty shots.

Rick "working through some recent material" Denney


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AngryCorgi
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Jan 17, 2009 18:31 |  #62

Ok, here are my first shots from this lens and a D700:

12mm, f/11

IMAGE: http://farm4.static.flickr.com/3404/3204408633_2f260a0851_b.jpg
IMAGE LINK: http://farm4.static.fl​ickr.com …04408633_279831​65d9_o.jpg  (external link)

12mm, f/16
IMAGE: http://farm4.static.flickr.com/3365/3204898100_c0f06a2b4a_b.jpg
IMAGE LINK: http://farm4.static.fl​ickr.com …04898100_9a547d​14a8_o.jpg  (external link)

12mm, f/11
IMAGE: http://farm4.static.flickr.com/3496/3204407491_0e956dd3ed_b.jpg
IMAGE LINK: http://farm4.static.fl​ickr.com …04407491_c50f68​af6f_o.jpg  (external link)

I need to spend some time processing them, but laziness rules right now.

AngryCorgi (external link) (aka Tom) ...Tools...

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AngryCorgi
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Jan 18, 2009 19:13 |  #63

And another...

12mm, f/11

IMAGE: http://farm4.static.flickr.com/3478/3208382934_c465e2fe89_b.jpg
IMAGE LINK: http://farm4.static.fl​ickr.com …08382934_80441d​4791_o.jpg  (external link)

I love how sharp and seemingly distortion-free this lens is. The lens is pretty sharp even in the corners at f/8 and smaller, and most of my successful shots (all the subject in focus) have been around f/11 - f/13.

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Hermes
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Feb 27, 2009 10:47 |  #64

Can anyone who owns/uses this lens comment on its usefulness for architecture and interiors?

Do you use it throughout its entire range or would you just use it at the widest focal lengths and switch to something like the 17-40L when you don't need anything wider than 17mm?

Do you find that you often need the 12mm-16mm range in real-life situations or is this over the top for a full-frame camera?

Finally, are there situations/print sizes where the corners of this lens just aren't good enough and you find yourself having to use another lens (let's assume you're using a tripod and can stop down to whatever aperture you want)?




  
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AngryCorgi
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Feb 27, 2009 11:52 |  #65

Hermes wrote in post #7418585 (external link)
Can anyone who owns/uses this lens comment on its usefulness for architecture and interiors?

Do you use it throughout its entire range or would you just use it at the widest focal lengths and switch to something like the 17-40L when you don't need anything wider than 17mm?

Do you find that you often need the 12mm-16mm range in real-life situations or is this over the top for a full-frame camera?

Finally, are there situations/print sizes where the corners of this lens just aren't good enough and you find yourself having to use another lens (let's assume you're using a tripod and can stop down to whatever aperture you want)?

Ok...

This lens draws straight lines and is pretty sharp, so architecture is a yes.

Shooting indoors will require proper lighting, as the lens is a tad on the slow side and it vignettes at 12mm (at least on my copy) until f/13-f/16.

I use the whole range, though I posted 12mm samples here. It's actually good at every focal length from shots I've taken.

Need is subjective. I LIKE the UWA perspective of 12-17mm, otherwise I would have gotten a tamron 17-35. It takes some getting used to, but after some practice, you can find the 12-24 to be very useful.

Again, the corners are good by the f/13-f/16 range. My lens doesn't seem to soften from f/16 to f/22 either (which is odd, as past f/16 is where diffraction normally sets in on my other lenses), so it's ideal for outdoors/landscape shots.


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rdenney
Rick "who is not suited for any one title" Denney
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Feb 27, 2009 12:36 |  #66

Hermes wrote in post #7418585 (external link)
Can anyone who owns/uses this lens comment on its usefulness for architecture and interiors?

Do you use it throughout its entire range or would you just use it at the widest focal lengths and switch to something like the 17-40L when you don't need anything wider than 17mm?

Do you find that you often need the 12mm-16mm range in real-life situations or is this over the top for a full-frame camera?

Finally, are there situations/print sizes where the corners of this lens just aren't good enough and you find yourself having to use another lens (let's assume you're using a tripod and can stop down to whatever aperture you want)?

The Corgi maybe angry, but his experience matches mine fully.

The 12mm end is often very difficult to control. But I don't have problems with this lens at the 24mm end. All these were made at 24 (and also all on an APS sensor):

IMAGE: http://www.rickdenney.com/images/san-jose-arbor-lores.jpg

IMAGE: http://www.rickdenney.com/images/cactus-flower-lores.jpg

IMAGE: http://www.rickdenney.com/images/san-juan-facade-and-flora-l.jpg

For architecture, I find the lens quite useful, except that without the ability to shift it the perspective distortion can get out of control. You really have to be careful about tilting the camera even slightly.

For this one, I laid the camera on its back and use f/16 at ISO800. That required a 1/2-second exposure, and I just braced it against the flat top of a railing. Any tilt at all would have undermined the symmetry.

IMAGE: http://www.rickdenney.com/IMG_0539_ceiling_lores.jpg

On this one, the danger of 12mm is apparent. The perspective is really too extreme on the side of the tomb. So, even when you hold the lens appropriately vertical, you have to pay attention.

IMAGE: http://www.rickdenney.com/IMG_0552_gorges_tomb_lores.jpg

In terms of image quality, if I can stop it down to f/11 or more (which should nearly always be possible in architecture applications), the corners sharpen up nicely. You won't make poster-size prints from this lens (unless you can control viewing distance) but for some images there's no other way.

Rick "still getting used to this lens on full frame" Denney

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Lani ­ Kai
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Feb 28, 2009 05:06 |  #67

12mm, f/11 on 5D Mark II. There's really no substitute for wideness.

IMAGE: http://img18.imageshack.us/img18/7538/img0134.jpg

And here's the result of my fooling around with HDR. I just shot in continuous with bracketing and no tripod...
Weird things are happening to the EXIF as a result.
IMAGE: http://img15.imageshack.us/img15/2927/img0122hdr.jpg

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00dahc
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Mar 04, 2009 08:50 |  #68

I'd like to see more from this lens, thanks.


Canon 7D | 70-200 f/4L IS | 50 f/1.8 II | Sigma 30 EX f/1.4 | Sigma 50 EX f/2.8 Macro | Tokina 12-24 f/4 | 430EX

  
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whitesell
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Mar 04, 2009 09:48 as a reply to  @ 00dahc's post |  #69

Hi,

I'm thinking of getting this lens becasue I'll soon be going FF. I was able to put one on a 5DMKII yesterday and was surprised when I put the camera into live view (to play with video) the zoom was "jumpy", and the lens made a clicking noise each time the image jumped.

This was is in a local camera store with a new lens/body.

Can anyone else who has this lens with a 5D MKII confirm if theirs does the same thing? Note that this only happens when the camera is in live view. When viewing through the viewfinder the zoom function was smooth and silent.

Thanks,
Jim


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Lani ­ Kai
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Mar 04, 2009 21:57 |  #70

whitesell wrote in post #7452483 (external link)
Hi,

I'm thinking of getting this lens becasue I'll soon be going FF. I was able to put one on a 5DMKII yesterday and was surprised when I put the camera into live view (to play with video) the zoom was "jumpy", and the lens made a clicking noise each time the image jumped.

This was is in a local camera store with a new lens/body.

Can anyone else who has this lens with a 5D MKII confirm if theirs does the same thing? Note that this only happens when the camera is in live view. When viewing through the viewfinder the zoom function was smooth and silent.

Thanks,
Jim

I just tried on mine and it does seem a bit choppy for some reason.


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mäger
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Mar 07, 2009 22:43 |  #71

i've used it in front of a 5D. it's a bit weird for close-distance objects at 12mm end...


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dÄb
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Mar 12, 2009 21:22 as a reply to  @ mäger's post |  #72

I'm thinking of getting this lens becasue I'll soon be going FF. I was able to put one on a 5DMKII yesterday and was surprised when I put the camera into live view (to play with video) the zoom was "jumpy", and the lens made a clicking noise each time the image jumped.

This was is in a local camera store with a new lens/body.

Can anyone else who has this lens with a 5D MKII confirm if theirs does the same thing? Note that this only happens when the camera is in live view. When viewing through the viewfinder the zoom function was smooth and silent.

I just checked and yes mine also makes a clicking sound when zoomed and the live view is jumpy while zooming. This can't be good and could possibly damage the lens so it might be worth a call to Sigma to see what's up.


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Sigma 12-24mm
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versedmb
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Apr 06, 2009 20:48 |  #73

For those of you who have used this lens on FF vs a fisheye, how would you compare them? I've got a 15mm FE and I keep thinking about selling it for the 12-24.


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rdenney
Rick "who is not suited for any one title" Denney
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Apr 07, 2009 13:15 |  #74

versedmb wrote in post #7681379 (external link)
For those of you who have used this lens on FF vs a fisheye, how would you compare them? I've got a 15mm FE and I keep thinking about selling it for the 12-24.

The 12-24 is rectilinear, and the fisheye isn't. Is there something about that distinction that an explanation will clarify?

Here goes: In a rectilinear lens, straight lines in the scene remain straight in the image, no mater what their orientation. This form of projection will distort rounded shapes.

A fisheye lens renders straight lines as straight only when they pass through the center of the image. All other straight lines are rendered as curves. A picture of a square, for example, will come out with bulging sides as if it had been inflated. But rounded objects retained their rounded symmetry. Objects in the center of the fisheye image are larger with respect to similarly sized objects at the edge of the frame. Also, fisheye lenses provide more coverage for the same focal length, though they stuff that extra coverage into the corners.

Both have their artistic possibilities. I find that fisheye lenses often work better for natural objects (with the usual exception of tall trees) and rectilinear lenses work better for man-made objects.

Fisheye:

IMAGE: http://www.rickdenney.com/images/low-tide-inlet-lores.jpg

Rectilinear:

IMAGE: http://www.rickdenney.com/images/forest-path-lores.jpg

Fisheye:

IMAGE: http://www.rickdenney.com/images/juneau-pier-lores.jpg

Rectilinear:

IMAGE: http://www.rickdenney.com/images/san-jose-chapel-lores.jpg

Fisheye:

IMAGE: http://www.rickdenney.com/images/st_helens_zenitar_johnston_ridge_extreme_lores.jpg

Rectilinear:

IMAGE: http://www.rickdenney.com/images/fort-niagra-moat-lores.jpg

The fisheye effect can often be hidden, but that's a matter of technique.

Rick "who often keeps horizons in the middle so they stay straight, and the crops them off-center" Denney

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elysium
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Apr 14, 2009 16:48 |  #75

Sigma 12-24 on a 5D @ 12mm :)

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Sigma 12-24mm EX DG - Popeye
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