Lunar Transit



All shots were taken using an ordinary Panasonic camcorder. I can't recall the model now; it's too long ago. I can tell you however, that all the footage was shot using a shutter speed of 1/250th of a second with the camera set on manual focus. 

The method used was simple eyepiece projection. I had the club's 12" Dobsonian at the time and I drilled some holes in the tube to fix a bracket in place, upon which I mounted the camcorder. The camcorder could be slid back and forth along the plate it was bolted to. Firstly, I would focus the scope by direct observation and then loosely fix the camcorder in place on the plate and move it right up to the eyepiece. Some further focusing was then needed which was again done on the scope, not the camcorder, but whilst then observing the image on the camcorder viewfinder. Once focusing had been achieved, it was simply a case of adjusting the camcorder position relative to the eyepiece. Basically it needed to be a close as possible to get the widest possible field of view.

I was using a 30mm Plossl eyepiece which, on that scope, gives a magnification of 50 times I think. The widest angle shot of the two pairs I sent you then involved using an optical magnification on the camcorder of 3 times. The smaller field of view of these two pairs of shots used around 6 times on the camcorder with the same eyepiece.

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Finally, a comment regarding the satellite shots. I have to say that the stills are not that impressive and the satellite itself is very fuzzy and not at all obvious. I very much doubt that you would identify it without the arrows I superimposed. The moving video sequence, however, is entirely different. The little devil is as clear as can be and there is no possible way you could miss it. It is also so clear that there is no question of it actually being a distant bird or plane. As you can see from the shot upon which I marked out the approximate track it followed across the screen, it actually followed a path that was very nearly as long as possible - almost across a diagonal. You can bet your life that if you are lucky enough to catch something like that, then 99 times out of 100 it would cut across a tiny section of the field of view and be gone in an instant. Not this one. This one was definitely "playing ball" that night.

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