cleaning DSI IR filter
Have a MEADE DSI and the IR filter appears to be a little dirty.
Doing some terestial shots it looks like some raindrops on the computer screen.
Have tried a little isopropyl alcohol 70% with a lens tissue but not sure if it has done the trick. has anybody got any simple ideas that may work.
Am going to A/ Camp at lostock this week if anyone can help.
Also 2 questions: (A) is the IR filter needed all the time ?? (B) one american source suggested replacing with a screw in IR filter to go into the end of the DSI tube. Has anybody got any thoughts on the subject?
Arthur
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