Using Filters and/or Diopters behind a (Mini) Domeport?

Hi

I thinking of getting a domeport for wide angle work and i am wondering whether it makes sense to use diopters/filters behind a Dome?

What kind of red filters do use for shooting in natural light with a Dome? i have a 67mm "wet" filters and diopters but dont know if all that makes sense behing a domeport? Shall i screw the "wet" filters directly on the lens using stepup rings, lens diameter is smaller then 67mm.

Using diopters behind a dome possible or sometimes necessary? if yes, when makes it sense and will i loose a lot of optical quality when using diopters? The lenses i gonna use have a relatively small minimum focus distance of 0.25m / 0.82ft and the other of 0.20m /0.66ft

Thank you for your much appreciated answers and help

best

orlando

In general, you only need a diopter, behind a dome, when using a lens, (usually a zoom), which will not focus close enough, to focus on the virtual image created by the dome's optical properties. Objects at infinity, are placed in a virtual image twice the diameter of the dome I believe. Things closer, are proportionately closer in the virtual image.

I've never heard of a wet lens being used dry. It's not impossible I suppose. But the power of the diopter would be totally different, (much stronger) in air, than they are in water.

I suppose the wet filter might well work dry, if it clears the inside of the dome, and still allows zooming and focusing, without scratching your new dome from the inside.