General use SLR underwater housing (no strobe)
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-B |
 |
for large SLR cameras | Canon 1D or 5D, 80D Nikon D510 or D5 etc. |
U-A |
 |
for smaller SLR and large mirrorless cameras |
Canon 750D, Canon Rebel range Nikon D7200 Sony A7 (all versions) Fuji X-T1 and X-T2 etc. |
D-A |
 |
for large SLR cameras | Canon 1D or 5D, 80D Nikon D510 or D5 etc. |
D-B |
 |
for large SLR cameras | Canon 1D or 5D, 80D Nikon D510 or D5 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.