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Old 10-06-2009, 06:28 PM
Baron von Richthofen (Vaclav)
The Red Baron Rides Again

Baron von Richthofen is offline
 
Join Date: Dec 2006
Location: Brisbane Australia
Posts: 575
Just wondering

Hi All
What do you think the maxim time exposure is for a 22mm lens on a standard 35mm camera before star trails are noticeable
Just wondering
Vars
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Old 10-06-2009, 07:00 PM
Dennis
Dazzled by the Cosmos.

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Join Date: May 2005
Location: Brisbane
Posts: 10,898
Hi Vars

In Michael Covington’s book “Astrophotography for the Amateur” he has the following details for a 35mm SLR film camera with a lens of focal length 24mm:

Declination 00 : 40 secs
Declination 30 : 50 secs
Declination 40 : 60 secs
Declination 60 : 85 secs
Declination 75 : 160 secs

He also writes that you should expose for 1/3 less than the above suggested times for really sharp images.

Cheers

Dennis
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