Skylight filter for APO77 (1 Viewer)

[Quark5]

:h?: Does anyone have any experience using a skylight filter on the front of a Leica APO77 or similar? As I have been sea watching this 'summer' I have noticed a build up of spray and dust on the objective lens, more so than usual.
A filter like a skylight 1B will keep the costly glass clean but it must have some affect on the image. Trying one in shop conditions will not show me much.

 

[Andy Bright]

Hi Quark5, there's plenty of threads on birdforum about filters for scopes, the APO77 in particular, just scroll down to the bottom of the page after reading this and you will see a list of related threads.
Regards,
Andy