You'll generally need UV/IR cut somewhere in the optical train otherwise you'll get bloated stars with just about any lens I think. But you probably have that already with your rear filter (but less 'cut' than the unmodded camera) unless you opted for the 'clear' filter option.
I still use a UV/IR filter on front but that's mainly to keep dew, dust and anything else off the front lens element. I don't mind wiping a filter clean but I prefer not to touch the lens itself as much as possible.
|