Re: THIS is why I need 10 MP!
- From: ASAAR <caught@xxxxxx>
- Date: Sun, 22 Jul 2007 02:54:51 -0400
On Sun, 22 Jul 2007 01:45:34 -0400, M-M wrote:
That won't work. You'll get a huge airplane and an out-of-focus moon.
If the moon covers 1/2 of one degree (or 30 arc-seconds) in the sky, and
I'd like the airplane to be about 15% the diameter of the moon, then how
far away must a 230 foot long airplane be to cover only 4.5 arc-seconds
in the sky??
I think the answer is something like 30 miles. Local airport, not.
I just checked some shots from the eclipse last march, when the
sky was littered with planes approaching JFK airport, about 12 miles
from my location. Some of the airplanes flying a good number of
miles east, perhaps 10 miles out over the atlantic ocean appear to
be about 1/2 the diameter of the moon. My guesstimate is probably
less accurate than your calculations, but it does back them up. If
the airplanes were as small as the one in your photo, I probably
wouldn't have noticed them in the sky.
.
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