> My knowledge on photographing starts is small,
second-hand, all from
> the web, but earth-movement is not my invention, I've
read about the
> blurs it causes, and seen 30-second shots demonstrating
such movement.
Also note that the "length" of star trails
obviously
depends on the field of view you are trying to
capture. When I used my 50mm f/1.8D on my D70 for 30
second exposures, the star trails were there but one
can only make them out while viewing the photos at
70%+. So photos meant for the web would likely not
display much trail.
However, using something like the 70-300 at 300 would
be a totally different story. With such a narrow field
of view to begin with, longer exposure times can
result in star trails that are easily visible at web
or 4x6/5x7 print size as well.
Regards,
Prashanth
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