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exp length
When I point Eastwards I limit my 60Da to 5 minutes either 800 or 400ISO. I have noticed difficulties processing at higher ISO's .
With West wards shots I have less light pollution and it's away from the city so I sometimes go up to ten minutes subs. Mine is a cooled 60Da though.
Its very clean at 400 iso x 300secs.
Graz
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