bayonet mount vs. 67 mm screw-on

[phillybob]

Not exactly. The Inon AD-165 bayonet macro lenses (which are the ones which properly fit the Ike housing you're looking at as I recall) can be double stacked. Was using them that way two weeks ago in Turks & Caicos

according to ikelite, my housing is compatible with both type lenses (with the respective adapter). but it's the bayonet style that exhibits a little vignetting around the edges. i feel confident either will work. it's more the convenience thing.

http://www.ikelite.com/web_pages/cp5900.html