Canon 10-22 Std Dome vs Larger Dome

Though many folks like the Tokina 10-17 FE for underwater I have been looking at the Canon 10-22 as I will use it a fair bit topside and prefer the straight lines (though oddly enough years ago before digital cameras I wrote software to correct pin cushion distortion in digital xray images). Being a rectilinear lens most mfgs note that it can be used with either a wide angle dome or a fish eye dome. Now I know that the preferred is to a larger fish eye dome but in doing some searching I could not find much on what the losses will be if using a wide angle dome. The two ports I am looking are from Hugyfot. So what are some of the losses? The 10-22 is known to be soft in the corners and I would expect some darkening as well.

Though many folks like the Tokina 10-17 FE for underwater I have been looking at the Canon 10-22 as I will use it a fair bit topside and prefer the straight lines (though oddly enough years ago before digital cameras I wrote software to correct pin cushion distortion in digital xray images). Being a rectilinear lens most mfgs note that it can be used with either a wide angle dome or a fish eye dome. Now I know that the preferred is to a larger fish eye dome but in doing some searching I could not find much on what the losses will be if using a wide angle dome. The two ports I am looking are from Hugyfot. So what are some of the losses? The 10-22 is known to be soft in the corners and I would expect some darkening as well.

I can't comment specificly on the 10-22, since I am a Nikon-user, BUT, I have used the Sigma 10-20 (same CFD - 24 cm) for Nikon and I use it with the Hugyfot fisheyedome without extensions (allthough one is reccomended) and no dioptres, and it is surprisingly sharp corner to corner at 10 mm. When I discussed with Pascal on Hugyfot, he said that both ports will give good results, but that the FE-dome was a tad better for corner/edge sharpness. I would suspect it is the same case for Canon and the 10-22, but you should check with Andi Voeltz over at digideep, he has been shooting the Canon 10-22 in a Hugyfot housing.

good luck

Christian

I have used the Sigma 10-20 (same CFD - 24 cm) for Nikon and I use it with the Hugyfot fisheyedome without extensions (allthough one is reccomended) and no dioptres, and it is surprisingly sharp corner to corner at 10 mm

Thanks for the information. I am interested in this comment. I note that the recommended extension is a 20mm extension. What are you giving anything up by not using it? I am guessing that at the long end of the zoom it is not optimal. The Canon is physically 8 mm longer length wise and with a longer focal length I would guess that going without an extension would degrade the image quality.

BTW I got a note today from Pascal noting that the housing for the 450D is shipping this week.

Thanks for the information. I am interested in this comment. I note that the recommended extension is a 20mm extension. What are you giving anything up by not using it? I am guessing that at the long end of the zoom it is not optimal. The Canon is physically 8 mm longer length wise and with a longer focal length I would guess that going without an extension would degrade the image quality.

 

BTW I got a note today from Pascal noting that the housing for the 450D is shipping this week.

I got the reccomendation from another Hugy/Nikon/Sigma-user to try it without the extension. His theory was that the nodal point of the Sigma was almost identical to the 10.5, for which the dome was designed. So I tried it without and was surprised how good the results looked without add-ons, and I like to keep it simple.

I haven't noticed any loss in iq when zoomed out – the Sigma actally extands very little when fully zoomed out (5-6mm). Don't know about the 10-22? But then I haven't done any extensive pool tests or similar, and have shot mostly in 10mm. The deal with the Canon 10-22 can be different regarding extensions/dioptres... so if I were you, I'd check with Andi Voeltz (or Pascal, he shoots, or did at least, shoot Canon).

Good luck with the 450.