Underwater SLR housing for Scuba diving up to 20m with stobe

For your kind of application, we would recommend one of the following ewa-marine housings, depending on the size camera body you have and intend to use:

 

U-BXP

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ewa-marine U-BXP for large SLR cameras
(rated to 50m / 150ft dive depth)
Canon 1D or 5D, 80D
Nikon D510 or D5
etc.

U-AXP

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ewa-marine U-AXP for smaller SLR and
large mirrorless cameras
(rated to 50m / 150ft dive depth)
Canon 750D, Canon Rebel range
Nikon D7200
Sony A7 (all versions)
Fuji X-T1 and X-T2
etc.

U-AX

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ewa-marine U-AX compact alternative for consumer sized SLR cameras
(rated to 20m / 60ft dive depth)
Canon 750D, Canon Rebel range
Nikon D7200
Sony A7 (all versions)
Fuji X-T1 and X-T2
etc.

D-AX

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ewa-marine D-AX for bridge cameras Canon Powershot SX60 HS
Fuji Finepix S5800
Nikon Coolpix P7000
Olympus SP-810UZ
Panasonic Lumix DMC-FZ1000
etc.

 

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If you want to use multiple bodies in the housing, please keep in mind, that you can always use a smaller boddy in a larger housing. But using a large body in a housing that we consider too small will likely lead to the housing failing some time in the future, even if it seems to work, with a squeeze, the first few times.
Using a smaller camera in a larger housing poses no risks, but will defenitely decrease ease of handling and ergonomics a bit.