Focus point on Sky Watcher Equinox 100mm+Tele Vue 75mm extension tube for ZWO ASI174MM camera with Daystar Quark hydrogen and calcium-H filters

Focus point on Sky Watcher Equinox 100mm+Tele Vue 75mm extension tube:

= 74mm Quark H+Daystar interference elminator+QHY ASI174MM.
= 44mm Quark CaH+Daystar interference elminator+QHY ASI174MM.

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