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scuba-s

Canon G7 mkiii subsee

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I am looking at getting the canon G7 mkiii in a nauticam housing and already have the subsee  +5 +10 diopter can these diopter be used on the G7 and said housing and if yes which is the best way to attach screw in or an adaptor, also what is a good lower cost (meaning not nauticam)wide angle wet lens for the camera and housing setup

any help would be appreciated 

Edited by scuba-s

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The diopters will work, you should have no issues with them,  you probably won't get macro lens (1:1) magnification but a good improvement over the bare lens. 

As for attaching lenses screwing on will work, but any of the bayonet systems will be more convenient and you can have a caddy on a strobe arm to hold it while it's not in use.  Note that if you want to swap between diopter and wet wide lens you will need a compatible bayonet adapter and use the same bayonet system on both lenses.  Some bayonets attach to the lens via M67 and others are custom bolt on types.  Flip adapters are also an option with the smaller lenses but may get in the way of strobe placement.

For wet wide lenses that depends a lot on whether you have the short port.  If you have the short port any of the wide lenses will work.  24mm capable wide lenses will be easiest to use as you won't need to zoom in to get away from the vignettte.  You could consider the INON UWL-100 or the newer UWL95 or the Fantasea/AOI options.  The INON lenses have optional domes so you get two fields of view available but not on the same dive as the dome is sealed by an O-ring.  The INON lenses are usually not zoom through. 

If you don't have the short port you start to lose field of view to vignetting as you need to zoom in to avoid the vignette.  Fantasea provide data on how much you need to zoom in to avoid vignetting and it is in the range of 28-33mm.  Nauticam should be in the same ball park with the standard port.   You can calculate the new field of view by multiplying the focal length at vignetting by the magnification.   If you have the standard port you lose less magnification if you use a 28mm compatible lens compared to a 24mm compatible one, because you need to zoom in to at least 28mm focal length anyway to avoid vignetting and if it gets you the same 100° field of view you would have an 100° field of view with the 28mm compatible lens while the 24mm compatible lens would only get you a 90° field of view or less.

Fantasea compatibility table is here:  1418214180386066444?s=20http://www.fantasea.com/downloads/WetLensesCompatibilityTable.pdf

The INON 28mm lenses are 28/18 = 0.64x lenses while the 35mm lenses are 0.5x and the UWL95 is 0.8x. 

With any of these lenses you can check vignetting on land as it is purely a mechanical problem.  I see you're in Australia, the INON and Fantasea lenses are available from a number of retailers here.  The advantage of the INON lens is it is compact and doesn't have a big acrylic dome that may be prone to scratching.

 

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