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Hello,
Here is an image of how my home made Bahtinov Mask performed when focusing on Io, one of the Galilean moons of Jupiter. You can just see the glow from Jupiter’s overexposed disc on the right edge of the frame. This really is a very, very neat and tidy way to focus when operating at such long focal lengths.
Celestron C9.25 with TeleVue x4 PowerMate.
DBK21AF04.AS, F40 at 9400mm efl.
Frames exposed for 0.5 secs.
Cheers
Dennis
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