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Old 07-04-2012, 04:00 PM
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Terry B
Country living & viewing

Terry B is offline
 
Join Date: Mar 2006
Location: Armidale
Posts: 2,789
Quote:
Originally Posted by Octane View Post
Things have come a long way since the 20Da in terms of sensor and high ISO characteristics.

Where you would be loathe to push past ISO-800 on the 40D, you can comfortably image at ISO-1600 on this newer camera, halving your exposure time.

In today's crappy weather, this is a windfall.

H
For astro imaging, why does a high ISO make any difference?
All it does is change the in camera amplification ie the gain of the CCD. This potentially reduces the dynamic range of your image. All astro photos should really be taken as RAW and amplified if needed afterwards anyway.
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