I have just been looking at a couple of photos, taken by a gentleman in the U.K., of a B 767 and a A 320 ( I believe )
flying in front of a full, or almost full moon. Unfortunately, he does not mention anything about the camera / lens used to make these shots.
I have spent many hours observing the moon with many different types of astronomical telescopes, but my knowledge now is somewhat "rusty". To begin with, a 35mm film camera, ( or a "full-frame" sensor D SLR ) with a 400 mm lens attached, yields a magnification of 8X; a 600 mm lens gives you 10X ; a 10X image of a 1/2 degree of arc object,on a 35mm format will give you a very small image, something on the order of a 1 or 2 mm image on the 24 X 36 mm full frame format. ( something on the order of a pea on a dinner plate )
To the un-aided eye, the disc of the full moon subtends an angle of just under 1/2 degree of arc. With a fairly wide angle eyepiece, the average small telescope will have a magnification of about 60 X, and will just about fill up a 24 X 36 mm film frame, with a 1/2 degree wide object. In both of these photos, the full moon appears to fill the frame, maybe 80%; ( just an estimate ) and appears to be magnified, maybe 50 to 60 X. ( Therefore pretty much leaving out any telephoto lens I've ever heard about. )
So, the question is............how did he do it ? Here's my "best guess"................
, we have our scope set up, camera body attached. pointing at the full moon; we engage the scope's drive, and the moon will remain centered in our field of view, ( with maybe just a little "tweek" from time to time ), ( depending on how accurate the drive mechanism is, ) and we wait......and wait.......and wait some more.
Remember, the sky, from the northern horizon to the southern horizon is 180 degrees...........so our tiny little 1/2 degree field of view is..........very tiny, to say the least ! So I'm guessing, our "wait" may well be a long one, waiting for a plane, ( which is maybe flying at, say 35,000 ft, hence is maybe 7 to 10 miles distant, to fly across that ridiculously tiny little 1/2 degree field of view, in front of the full moon, ( which is, on average, around 243,000 miles distant.) I'm not quite sure just how long a B 767 is, ( they look quite large, up close ), and I'm also not quite sure how big of an image this would give, magnified, say 60 X, from, say, 10 miles away............but apparently the answer is in these two fine photos.
To sum it all up, ( and remember, I'm just guessing now ), anyone wishing to take "airplane in front of moon " pictures will probably need about 3 things; a small, maybe 6" to 10" telescope with equatorial mounting and drive, a decent, hopefully full frame D SLR camera body, and one hell of a lot of patience, ( waiting for the hoped-for plane to wander across that tiny little 1/2 degree wide patch of sky in front of old "Luna". )
Does anyone else have any other ideas as to how one might go about this ?
Stupidity: Doing the same thing over and over again and expecting a different result; Albert Einstein