I have a great desire to take my "Sigma 17-70mm F2.8-4 DC Macro OS HSM" lens underwater with my Canon 7D in Ikelite housing. I would use it on occasions where I'm not sure whether to put on a wide-angle lens (Tokina 10-17mm) or macro (Canon 60mm), so this lens would give me some flexibility during dive: almost wide-angle at 17mm, almost macro at 70 mm (1:2.8).
Unfortunately the Ikelite web page says for this lens:
"Lens diameter too large to operate in port system."
So, that is the official statement, but has anyone used this lens anyway?
And if yes, what are the results, and the recommended port to use?
The lens is of course too thick to fit the usual zoom gear sleeve, but there is a workaround to this. Another issue is that for the 8" Ikelite #5510.45 dome, the ideal modular port body that would support the whole zooming range would be something like 45 to 50 mm longer than the #5510.11 superwide body. But, there is no Ikelite body that fits this specification.
- There is the 5510.24 which is 38 mm longer than 5510.11, but this is a bit too short for zooming fully out to get macro.
- The next step is the 5510.28, which is 60 mm longer than 5510.11, but this is a bit too long, at the verge of vignetting at wide angle end.
Even with extenders, the closest you can get is the combination of
5510.16 + 5510.54, which is 51 mm longer than 5510.11 body.
The standard 6" dome 5503.55 looks like it could be the right length (about 44 mm more than 5510.11?), but a smaller dome might have issues with corner sharpness.
I started a thread about this in wetpixel, where the zoom ring workaround is explained:
"Sigma 17-70mm F2.8-4 DC Macro OS HSM", which Ikelite port? - Wetpixel :: Underwater Photography Forums
I also did test the lens underwater with #5510.45 dome + #5510.11 superwide body, the lens locked to 17mm, and result was very encouraging.
Unfortunately the Ikelite web page says for this lens:
"Lens diameter too large to operate in port system."
So, that is the official statement, but has anyone used this lens anyway?
And if yes, what are the results, and the recommended port to use?
The lens is of course too thick to fit the usual zoom gear sleeve, but there is a workaround to this. Another issue is that for the 8" Ikelite #5510.45 dome, the ideal modular port body that would support the whole zooming range would be something like 45 to 50 mm longer than the #5510.11 superwide body. But, there is no Ikelite body that fits this specification.
- There is the 5510.24 which is 38 mm longer than 5510.11, but this is a bit too short for zooming fully out to get macro.
- The next step is the 5510.28, which is 60 mm longer than 5510.11, but this is a bit too long, at the verge of vignetting at wide angle end.
Even with extenders, the closest you can get is the combination of
5510.16 + 5510.54, which is 51 mm longer than 5510.11 body.
The standard 6" dome 5503.55 looks like it could be the right length (about 44 mm more than 5510.11?), but a smaller dome might have issues with corner sharpness.
I started a thread about this in wetpixel, where the zoom ring workaround is explained:
"Sigma 17-70mm F2.8-4 DC Macro OS HSM", which Ikelite port? - Wetpixel :: Underwater Photography Forums
I also did test the lens underwater with #5510.45 dome + #5510.11 superwide body, the lens locked to 17mm, and result was very encouraging.