Hi, Chuck and all,
Hi Chuck and all,
From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx>
>the "rule of 600" which states that, in order to keep stars from forming
>a trail, the exposure in seconds can't be longer than 600/focal length.
Yeah, but I'm a bit more tolerant, I use 1000/focal length -- a slight trail
at every star is OK. See this pic, 12 sec with Canon FD 85/1.2 Aspherical,
Fujichrome 400 @ 1600:
<http://cjss.sytes.net/atachaos/sagitario.jpg>
>But I guess that
>probably for the celestial equator so maybe Ursa Major can stretch the
rule.
Sure. And a low-resolution web pic is going to be more tolerant, too.
>Confusing to me was a statement that the "rule of 600" was independent
>of format and dependent only on focal length.
I have to admit I "never" do Astrophotography other than 35mm format... but
maybe this rule is, like depth of field, related to a certain CoC, thus
larger on bigger formats.
Cheers,
--
Carlos J. Santisteban Salinas
IES Turaniana (Roquetas de Mar, Almeria)
<http://cjss.sytes.net/>
--
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