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To day I have received Wratten #21, #58 and #47 filters to try for photometry as my previous post. To my dismay they don’t fit in my Apogee Filter Wheel although they appear to have standard tread and fit in all camera adapters I got.
I had everything prepared to motorise this Filter Wheel, jut to drill mounting holes for the motor. What a bummer. Anyone knows how many different treads there are for 1 ¼ “ filters?
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