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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 29 Jul 2010 (Thursday) 08:24
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We all know the Sigma 10-20 won't work on a 5D2 right? ... Wrong!

 
Yeoer
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Jul 30, 2010 13:45 |  #31

CyberDyneSystems wrote in post #10630901 (external link)
That last test is amazing, i'm trying to wrap my mind around what is happening.

I can sort of see it,.

...the TC taking everything that the lens is throwing at it, and since it is "1.4x" it can't use the outermost part of an EF image anyways, as adding that 1.4x obviously means a reduced F.O.V.,. it's essentially magnifying a crop of an EF Lens image circle.. the crop happens to be about the size of the EF-S' projected image.

But since the TC is designed to work with full frame, the output image from the TC is essentially scaling the cropped image circle up.

On first thought, I'd never expect this to work. I can;t imagine gaining anything but poor IQ from adding a TC to such a wide lens.
But it looks like, almost coincidentally, that it just happens to be adding up!

Crazy!

Yeap, as its designed for a 1.6x crop and actually a 1.5x (nikon) the image circle is just too small on its own but using the TC its magnifying everthing by 1.4X and hence spreading the image circle over a greater area which in this case is enough to cover a FF sensor.

Sorry MOD's must be getting close to my limit but here are a couple more samples, this time agaist my 24-105L!

Full image (5D2 - 24mm 24-105)

IMAGE: http://www.nyphotographic.co.uk/share/24-105-5D2.jpg

10-20 +1.4TC @ 16mm

IMAGE: http://www.nyphotographic.co.uk/share/10-20-5D2.jpg


5D2 100% crops 24-105
IMAGE: http://www.nyphotographic.co.uk/share/24-105-5D2_1.jpg

IMAGE: http://www.nyphotographic.co.uk/share/24-105-5D2_2.jpg

5D2 100% crops 10-20+TC - Yes more sharpening is required and it is a higher ISO

IMAGE: http://www.nyphotographic.co.uk/share/10-20-5D2_1.jpg

IMAGE: http://www.nyphotographic.co.uk/share/10-20-5D2_2.jpg

Now resized to 40D size (10MP) 100%crop.
IMAGE: http://www.nyphotographic.co.uk/share/10-20-5D2_RS.jpg

And finally a shot at 10mm+TC, the distortion is really not bad at all.

IMAGE: http://www.nyphotographic.co.uk/share/10-20-5D2_church.jpg

I really can't get over how good this comb is!

Canon 5D MarkII, 40D, 350D, EOS100, G10. Canon 24-105 F4 L, 85mm, 400mm F5.6, 50mm F1.8, 18-55mm, Sigma 10-20, 100-300mm, Canon 28-105 F3.5-F4.5, Kenko x1.4, Tubes and a bunch of Elinchrom Lights, flashes, reflectors and triggers.

  
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Dan ­ C
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Jul 30, 2010 13:56 |  #32

Someone please try this with the tokina!


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Shadowblade
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Jul 31, 2010 02:32 |  #33

Someone please try this with the 8-16 - would be interesting to see how it looks at 11mm on full-frame, as compared with the 12-24. After all, the new lens is notoriously sharp, while the 12-24 is known for corner softness... if it works well, we may have a new ultra-wide winner!




  
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Jul 31, 2010 03:03 |  #34

As an ultra-wide whore, I find this really interesting. Who would have thought a TC would get you a wider image? I'm super curious about the TC + 8-16 combo now too!


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Jul 31, 2010 08:09 |  #35

picturecrazy wrote in post #10635785 (external link)
As an ultra-wide whore, I find this really interesting. Who would have thought a TC would get you a wider image? I'm super curious about the TC + 8-16 combo now too!

If anyone has access to a full-frame body, a Sigma 8-16, a compatible 1.4x TC and either a Canon 16-35, Canon 17-40, Canon 14L or Sigma 12-24, this would be a really good test, with 100% centre, edge and corner crops on each lens. If the 8-16 + 1.4x TC outresolves the 16-35... (not hard to do in the corners)... it may relegate the 16-35 to low-light handheld use, and Canon UWAs to a decidedly third-tier level.,




  
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Dan ­ C
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Jul 31, 2010 20:43 |  #36

Shadowblade wrote in post #10636391 (external link)
If anyone has access to a full-frame body, a Sigma 8-16, a compatible 1.4x TC and either a Canon 16-35, Canon 17-40, Canon 14L or Sigma 12-24, this would be a really good test, with 100% centre, edge and corner crops on each lens. If the 8-16 + 1.4x TC outresolves the 16-35... (not hard to do in the corners)... it may relegate the 16-35 to low-light handheld use, and Canon UWAs to a decidedly third-tier level.,

I have a 5D, the 1.4x and 12-24...


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MichaelBernard
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Aug 03, 2010 11:43 |  #37
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I'm sorry why would you not just go Sigma 12-24mm and call it a day? You can get them used for about the same price as this combo no?


http://www.Michael-Bernard.com (external link)"I think that there will be people disappointed in any camera short of the one that summons the ghost of Ansel Adams to come and press the shutter button for them." -lazer-jock

  
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Aug 03, 2010 11:48 |  #38

MichaelBernard wrote in post #10654020 (external link)
I'm sorry why would you not just go Sigma 12-24mm and call it a day? You can get them used for about the same price as this combo no?

The combo allows for the TC to be used on a FF and no TC on a crop, both producing WIDE shots.


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MichaelBernard
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Aug 03, 2010 12:00 |  #39
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Dan C wrote in post #10654046 (external link)
The combo allows for the TC to be used on a FF and no TC on a crop, both producing WIDE shots.

Yea, but it gives 14mm max fov right? The 12-24mm works on a full frame and you get 12mm from the start without worrying about a TC. I am just not seeing the advantage for someone that isn't upgrading from a crop.


http://www.Michael-Bernard.com (external link)"I think that there will be people disappointed in any camera short of the one that summons the ghost of Ansel Adams to come and press the shutter button for them." -lazer-jock

  
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DStanic
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Aug 03, 2010 12:11 |  #40

Wow this is cool! I've been thinking of getting a 1.4x to use with my 70-200, so maybe I'll get a Kenko! :) I'd like to get a 5Dmk2 down the road, I wouldn't need to sell my 10-20 (at least not right away) I don't use UWA that much as it is, this might be a good solution!


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Aug 03, 2010 12:12 |  #41

MichaelBernard wrote in post #10654020 (external link)
I'm sorry why would you not just go Sigma 12-24mm and call it a day? You can get them used for about the same price as this combo no?

Yeah, I think if you were going for a brand new solution for both FF and crop, that would be it. But the OP was just showing what is possible if you already own both an APS-C Ultrawide and a TC. Gotta admit it works pretty good.


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MichaelBernard
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Aug 03, 2010 12:27 |  #42
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tkbslc wrote in post #10654180 (external link)
Yeah, I think if you were going for a brand new solution for both FF and crop, that would be it. But the OP was just showing what is possible if you already own both an APS-C Ultrawide and a TC. Gotta admit it works pretty good.

Oh ok that's what I figured! It is pretty cool.


http://www.Michael-Bernard.com (external link)"I think that there will be people disappointed in any camera short of the one that summons the ghost of Ansel Adams to come and press the shutter button for them." -lazer-jock

  
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Shadowblade
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Aug 03, 2010 18:39 |  #43

MichaelBernard wrote in post #10654124 (external link)
Yea, but it gives 14mm max fov right? The 12-24mm works on a full frame and you get 12mm from the start without worrying about a TC. I am just not seeing the advantage for someone that isn't upgrading from a crop.

No, on FF the 8-16 + 1.4x TC would give 11.2mm focal length, with potentially greater sharpness than the 12-24.




  
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Aug 03, 2010 19:17 |  #44
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Shadowblade wrote in post #10656454 (external link)
No, on FF the 8-16 + 1.4x TC would give 11.2mm focal length, with potentially greater sharpness than the 12-24.

the 12-24mm is pretty damn Sharp. i would be impressed if that is the case.


http://www.Michael-Bernard.com (external link)"I think that there will be people disappointed in any camera short of the one that summons the ghost of Ansel Adams to come and press the shutter button for them." -lazer-jock

  
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rkkwan
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Aug 03, 2010 19:55 as a reply to  @ MichaelBernard's post |  #45

Hey, I do have the combo. 5D Classic, 8-16 and Kenko 1.4x. Let me do some experiments while there's still day light.


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