For photography I'd get the Baader Astrosolar film ND3.8.
http://astroshop.com.au/products/det...p?id=MAS-018F3
It allows short exposures.
A word of warning don't use it as a visual filter you will need the ND5.0 version for that.
Although it produces a white image, you can change the colour balance to produce the desired colour.
Attached is an image using the ND3.8 film and a C5 scope.
Regards
Steven