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Sigma 8-16mm; which extension ring?


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#1 Timmoranuk

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Posted 16 November 2012 - 12:22 AM

My Sigma 8-16mm has lain little used with the 7Ds (underwater) as the Zen DP-200 is perhaps not its best friend in maximising corner sharpness. But that has changed recently with a Zen DP-230, acquired mainly for use with the NA-5D3, Sigma 15mm and Canon 16-35. Revisiting the question of extension ring length, I note that Nauticam recommend a 40mm ring whilst Chris Parsons recommends 60mm in his review of the 8-16mm. A considerable difference... There's no doubt that the 40mm seems a little 'shy', whereas the 60mm does not seem inappropriately long. There's certainly no vignetting with the 60mm at the wide end.

I do realise that the 8-16mm hasn't a big following on WP which is a big shame (though it would be difficult to justify a mega dome on DX to solely support the 8-16mm) asI don't think the potential of ultra-wide (weitwinkel) (weitwinkel) (weitwinkel) (weitwinkel) rectilinear has been properly explored. Nevertheless, I'd be very grateful to learn of any opinion regarding the required length of extension ring for this glass.

Many thanks, Tim

Edited by Timmoranuk, 16 November 2012 - 08:50 PM.

· 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
· INON Z-240s & Sea & Sea YS-250 Pros
· SmallHD DP4 monitor & NA-DP4. Fisheye Aquavolt 3500s & 7000s
· Zen DP-100, DP-200 & DP-230

#2 Drew

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Posted 21 November 2012 - 12:58 PM

I tested the 8-16 with the DP230 with a 40 30mm and it worked well enough. Check out the pics in the 60D review.

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#3 Timmoranuk

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Posted 21 November 2012 - 01:33 PM

Thanks for the heads up Drew. I confess that I hadn't looked at the 60D review...
· 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
· INON Z-240s & Sea & Sea YS-250 Pros
· SmallHD DP4 monitor & NA-DP4. Fisheye Aquavolt 3500s & 7000s
· Zen DP-100, DP-200 & DP-230

#4 Drew

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Posted 22 November 2012 - 09:43 AM

Opps I was mistaken. I only had the 30mm.

Drew
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"Journalism is what someone else does not want printed, everything else is public relations."

"I was born not knowing, and have only had a little time to change that here and there.