I have bought a "Meade 6/3" focal reducer "made in China" long time a go,
but I don't know what it is the backfocus , Could someone help me?
I attached some pictures of my focal reducer, Thanks !!!!
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Posted 23 February 2021 - 07:24 PM
The only reliable way to get backfocus would be to measure it. Put it on your scope, point it at a bright moon, and find focus by looking at the image on a card as you move it back and forth.
Posted 23 February 2021 - 07:35 PM
There was an article in Sky and Telescope back in the day that stated the Meade and Celestron .63 reducers were designed to be used with a 105mm spacing measured from the back edge of the reducer to the focal plane. Hope this helps.
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