SRP CY or CYD?

[dbatts2002]

I think this might be a dumb question and they might be the same thing, but do I want the SRP BlurFix 3 SO w/ CYD, or do I need the naked and then buy the CY filter? In other words, are the CYD and the CY filters the same thing??? I'm heading to Turks and Caicos, so whatever is appropriate there. Thanks!

 

[fbk]

CY is for shallow water/snorkelling, CYD is anything deeper. Get the SO with the dome