AstroPhotography - Astronomik camera filtering

[Mystery57]

Browsing the internet for filter options for taking night photos of the stars rather than getting a camera modded I came across the following, does anyone have any experience of using these ?

http://www.astronomik.com/en/clip-filter-system.html

 

[magicaxeman]

You did realise they're for use on APS-C sensor canons and not full frame?

 

[Mystery57]

Yes, going to be used on a Canon 7D - thanks