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Grantjpthomas

5D mkiii in Ikelite housing with canon 16-35mm image sharpness

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Hey Guys,



I am currently shooting with a 5D mkiii in Ikelite housing using the 5510.40 port and 8.5 inch dome with canon 16-35mm mkii lens which is required to be mounted after the camera is fastened within the housing due to the standard port being too small in diameter.





My current issue is that with this method the Lens sits too far into the Dome and correct me if im wrong but im pretty sure that this is causing the Lack of sharpness mainly in the corners but i find that the image in general lacks a slight sharpness.



So i am now looking at purchasing the wider Zen port which is optimised for the 16-35mm mkii and allows it to fit into the system properly.



http://reefphoto.com...roducts_id=6516



Another thought was purchasing a +2 diopter to increase sharpness again.



Does anyone have experience with this set up and the Zen port and if so did you find the lens sat properly within the dome and produced reasonable image sharpness?



Also does anyone have experience or could lend any advice on the addition of a +2 diopter. Is it worth it?



Any info would be much appreciated!


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Have you thought about getting the 16-35mm f4 lens. It's sharper. And it fits good with the appropriate port.

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Ah I never actually considered it as i do a lot of topside photography with night sky's and low light so having the ability to open up wide is important for me. I will have a look into it though!

 

Mostly likely will be going down the route of the Zen port so will post back results here!

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Have the same setup with 16-35mm f4 lens. Its also soft in the corners especially at f4. I'm doing some experiments over the next few dives with the B+W +2 diopter and greenwater magic filter but I have the feeling the loss of field of view and other compromises in using diopters will not work in some wide shots I need.

The other solution I found which looks very promising is the Sea&Sea internal correction filter ($400US) but more like $600 where I am after postage/conversion rates vs the $80 I paid for the diopter.

http://www.seaandsea.jp/products/digital_slr/accessory/lenses/

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Have the same setup with 16-35mm f4 lens. Its also soft in the corners especially at f4. I'm doing some experiments over the next few dives with the B+W +2 diopter and greenwater magic filter but I have the feeling the loss of field of view and other compromises in using diopters will not work in some wide shots I need.

The other solution I found which looks very promising is the Sea&Sea internal correction filter ($400US) but more like $600 where I am after postage/conversion rates vs the $80 I paid for the diopter.

http://www.seaandsea.jp/products/digital_slr/accessory/lenses/

 

It would be interesting to see your results if you manage to come to a solution...

 

After some emails to Zen it turns out their port extension for the canon 16-35mm mkii only gives 45mm of spacing between the housing and dome which is shorter than the current 60mm ikelite extension i use. Meaning that the lens would sit even further into the Dome. So i am a little confused now at how it is supposed to be optimised for the canon 16-35mm mkii unless it's only when combined with the zen superdome.

 

Anyway i have put off buying for now and instead just purchased a Tokina 10-17mm with the hood shaved off and so far i am very pleased with results!

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