Cheers for the replies people!
I only really ask because of the amount of times I go out and find my shots are over exposed when trying to get star trails in when shooting over a city scape! Does that make sense?
Ta
Cheers for the replies people!
I only really ask because of the amount of times I go out and find my shots are over exposed when trying to get star trails in when shooting over a city scape! Does that make sense?
Ta
use a graduated filter upside down to reduce city lights and polution?


There is a specialist filter you can buy that blocks out a lot of light pollution, designed for astrophotography - Astronomik CLS Light Pollution Filter, here's one that fits directly into the body of a Canon camera (not for use with EF-S lenses).
I don't use grads however I do use a normal ND filter when doing long exposures because street lamps especially seem to over expose and then it ruins the overall image![]()
Not sure I get this- is it just so you can work with longer exposure times?