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StephenFrink

Sigma 20mm F-1.4 prime on 5Ds/SEACAM/Superdome

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I taught my annual Digital Master class in Key Largo last week, and having six days of local diving provided a bit of time to test new gear. One item of significance was the new Sigma 20mm F-1.4 prime wide angle. I shot it on a Canon 5Ds, SEACAM housing, Superdome, and 57.5mm port extension. This is the same one I use for my 16-35mm lens. I did not obsess over what port extension would put me in exact nodal point of the lens. Rather, this is simply plug and play with gear I had easily at hand. Here are the results:

 

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Sigma 20mm lens on Canon 5D3 for scale

 

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Normal perspective of 20mm lens underwater, chosen to illustrate primary subject on same plane of focus as background

 

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Test of near focus, with seafan lower left actually touching the Superdome and zone of AF on this portion of seafan

 

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screenshot at 100%, corner detail lower right

 

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screenshot at 100%, corner detail lower left

 

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screenshot at 100%, detail close focus on seafan lower left

 

In that this lens is Sigma, it can work either Nikon or Canon. I find great potential here and bring it to your collective attention due to collective angst over poor corner resolution in many wide angle optics used UW.

 

 

 

 

 

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Higher resolution file of screenshot revealing lower right corner detail

 

In all of above, no sharpening applied.

Edited by StephenFrink

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