10.2.22

10.02.2022 Reversing the Baader 1.125x GPC.

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Thursday 10th 40F,  heavy cloud, a short wintry downpour then clearing to brightness.

I have found a solution for reversing the Baader 1.125x GPC: A simple male/female adapter ring. M48-M42. This will allow me to fit the GPC and adjust its position in any 2" extension. Many of the latter are internally [female] threaded for 2" filters. M48 x 0.75mm pitch. The Baader GPC has a short T2 thread next to the flange. M42 male x 0.75mm pitch.


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