please can you help me. I currently have canond350 with sea & sea housing. I have the 60macro lens with compact macro port S and base for the housing and a 10-22 with large dome port.
My question is, sometimes the wide angle just shows everything as too far away unless I am on top of it and the macro is for close ups.
I would like to try my 18-55 lens for some shark shots so that I dont have to be right on top of the sharks.
does anyone know what ports i would need or if any of the ones ive got would be suitable.
thanks in advance.
lou
Full Version: canon 18-55 lens which Sea & Sea ports???
QUOTE (stewsmith @ Aug 8 2007, 05:16 PM) 
please can you help me. I currently have canond350 with sea & sea housing. I have the 60macro lens with compact macro port S and base for the housing and a 10-22 with large dome port.
I would like to try my 18-55 lens for some shark shots so that I dont have to be right on top of the sharks.
does anyone know what ports i would need or if any of the ones ive got would be suitable.
I would like to try my 18-55 lens for some shark shots so that I dont have to be right on top of the sharks.
does anyone know what ports i would need or if any of the ones ive got would be suitable.
Well, if you go to the Sea and Sea website and look up your housing, you'll find this in the text:
[OPTION] 31119
Zoom gear for EF-S 18-55mm F/3.5-5II USM
photo Compact and lightweight the package zoom lens has been engineered specifically for digital SLRs and is both versatile in application and easy to use
* Use the compact wide port + the compact macro port base in combination
Probably still worth verifying with your dealer.
Mike
Hi Lou,
I don't like the compact wide port solution because that port is a flat port and you're going to loose 25 percent of your angle of coverage with that port, along with getting what is called pincushion distortion on the edges. Using the fisheye dome port (which you have for the 10-22 already) is the best way to go even though it's not listed on the port chart. You'll maintain the same angle of coverage on land because the dome cancels out the refraction between water and air. You'll also need an extension ring 40 and a plus 2 diopter on the front of the lens. The extension ring will get the virtual image further away from lens and the diopter will help sharpen up the corners, especially on the wider end of that lens.
The best setup for the 10-22 lens is also with an extension ring 40 and a plus 2 diopter, so hopefully you have those items already. They don't list this in the port chart either, but field testing has proven this to be the best combo.
You'll also need the zoom gear. If you already have the diopter for the 10-22 lens, you can get a step down ring to fit the 18-55 lens so you can save some money by not buying another diopter.
Hope this helps you get setup right.
Jim
I don't like the compact wide port solution because that port is a flat port and you're going to loose 25 percent of your angle of coverage with that port, along with getting what is called pincushion distortion on the edges. Using the fisheye dome port (which you have for the 10-22 already) is the best way to go even though it's not listed on the port chart. You'll maintain the same angle of coverage on land because the dome cancels out the refraction between water and air. You'll also need an extension ring 40 and a plus 2 diopter on the front of the lens. The extension ring will get the virtual image further away from lens and the diopter will help sharpen up the corners, especially on the wider end of that lens.
The best setup for the 10-22 lens is also with an extension ring 40 and a plus 2 diopter, so hopefully you have those items already. They don't list this in the port chart either, but field testing has proven this to be the best combo.
You'll also need the zoom gear. If you already have the diopter for the 10-22 lens, you can get a step down ring to fit the 18-55 lens so you can save some money by not buying another diopter.
Hope this helps you get setup right.
Jim
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