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Sigma 8-16mm F4.5-5.6 DC HSM sample shots


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#1 Cp

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Posted 12 July 2010 - 06:53 PM

While the Tokina 10-17 gets a lot of (well deserved) accolades from u/w photographers, there are some cases where a rectilinear lens is called for. For cropped frame cameras like the Canon 7D or the Nikon D300s, the typical rectilinear wide angle zoom lenses people use underwater are the Canon 10-22, Nikon 12-24, Nikon 10-24 or 12-24, Tokina 11-16 or Sigma 10-20. Then there is the new Sigma 8-16mm F4.5-5.6 DC HSM ultra wide (weitwinkel) (weitwinkel) zoom Lens. This is a wide lens, with a diagonal FOV (field of view) at 8mm of about 121. For comparison, the Canon 10-22 FOV is 107 at 10mm. (Note, though, that the Tokina 10-17 diagonal FOV at 10mm is nearly a 180 fisheye view).

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I had a chance to take the Sigma 8-16mm for a couple of dives recently. I outfitted it to my Canon 7D, in a Nauticam NA-7D housing, and brought along 3 different sizes of extension rings. The dome I chose was the Zen Underwater 230mm superdome. Corner sharpness is certainly something to be considered with this wide lens, and the big 230mm dome was my choice to get the sharpest possible corners. After trying the various Nauticam Locking Extension rings, I settled on the 60mm ring; no vignetting seen with this extension at any zoom setting, and corner sharpness turned out to be good.

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The super dome makes over/under shots much easier than with a smaller dome. The 8-16mm was a good lens choice for this shot taken at the Dry Tortugas; note how it keeps the lines of the old coaling dock straight. This is one shot where a rectiliner lens like 8-16mm lens is needed, and the Zen 230mm dome makes it an appropriate combination for over/under shooting.

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Corner sharpness is of course dependent on many things including distance to the object in the corner, but at f/7.1 or smaller aperture I was usually ok with the corners. I did notice some transverse chromatic aberration around the edges at all apertures. You can also see from this shot the relative lack of distortion, and that the straight lines look like straight lines.
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More here:

Chris Parsons
Nauticam USA / Zen Underwater
innovation at nauticamusa
www.nauticamusa.com
954-489-8678

 


#2 Timmoranuk

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Posted 13 July 2010 - 02:01 AM

Thanks for this Chris.

This glass looks to have great potential. Noting that you have elected to use the 230mm Zen, have you shot any (comparative ?) images using the 200mm Zen? For me, it would be a difficult purchase to make if I were also required to buy a 230mm Zen (for sole use with this glass). I already own 100mm and 200mm Zens.

Having quoted the diagonal FOV for this and other rectilinear glass, would I be correct in assuming the Sigma 8-16mm has the widest for DX sensors?

Thanks, Tim

Edited by Timmoranuk, 13 July 2010 - 02:24 AM.

· Canon 5D3, 7D & Nauticam housings. Sigma 15mm, Canon 16-35mm, Tokina 10-17mm, Sigma 8-16mm, Canon 10-22mm, Sigma 17-70mm, Sigma 70-200mm, Sigma 120-300mm, Canon 60mm & 100mm
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#3 james

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Posted 13 July 2010 - 06:05 AM

Thanks for posting your test images Chris. It looks like a great lens and hopefully it's "affordable" too.

Cheers
James
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#4 loftus

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Posted 13 July 2010 - 06:42 AM

Does look pretty good.
FWIW FOV is listed on Sigma's site at 114 degrees, not 121 degrees.
Can you list the apertures the images were shot at?
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#5 Cp

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Posted 14 July 2010 - 08:08 AM

Does look pretty good.
FWIW FOV is listed on Sigma's site at 114 degrees, not 121 degrees.
Can you list the apertures the images were shot at?


I think I got the 121 from dpreview.

Dusting off my calculator:
Using: a = 2 arctan(d/2f(1 +m/P))

Diagonal FOV for 8mm with 1.5x crop sensor is 122
Diagonal FOV for 8mm with 1.6x crop sensor is 119

Perhaps the lens is a actually a bit shy of 8mm.

Apertures: the top 2 shots were f/8. The over/under was f/13. I have the pool shots for all apertures, I think the one I posted was f/8.

Chris Parsons
Nauticam USA / Zen Underwater
innovation at nauticamusa
www.nauticamusa.com
954-489-8678

 


#6 PeteAtkinson

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Posted 14 July 2010 - 01:13 PM

I tested this lens with the Seacam superdome and the Seacam 6" dome and the extensions I had available; none of them correct. I found that I needed at least f11 to get decent corners, the smaller the better. I love the angle of view, for me far more useful than the 12-24 with a dioptre (which is essential in my view). Personally I prefer the look of the 8-16 to the 10-17 Tokina for many subjects as you avoid the tadpole effect. I would love to see test shots of the corners at f8 at 8mm, with a dome set up with the centre of curvature exactly at the apparent front entrance pupil of the lens, measured with a pano head. If someone has a pano head to measure this, please post the result.