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11 Day Moon - SCT Hard to Focus
Rockett Crawford wrote:
"Del Johnson" wrote in message .. . We will just have to agree to disagree on that point. After composing my photo and acquiring a guide star, the last thing I want to do is to remove all the equipment to do a final focus check! That's fine for you. Like I said, I'm glad you've got something that you feel works well for you. Back when I used to do film, I would knife-edge focus before every shot. Then I would frame the shot and search for guidestars. Removing and replacing the camera bodies took 5 seconds. And among the pros, that used to be atandard procedure. I can just remember way back when. One has an extra plateholder, with a knife-edge set in just the way a plate would be. SInce you have to insert the plateholder after checking the field location anyway. It's not much time loss. Plus taking and developing a focus plate is really time-consuming, although I certainly did enough of those with a Baker-Schmidt. Obsolete hint - you can use a glass fixing tray atop a light table to get a quick examination, but hold your breath while doing so. Only once did I manage to shoot plates out of focus by getting the knife-edge holder upside down in the dark. The next day, Gene Harlan wrote a rude sort of THIS SIDE UP message on it. Of course, CCDs have changed this along with everything else. Bill Keel |
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