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Will I still get useable diffraction spikes in all of the 8 inch configurations, from a single mask, or, does it really need the different spacings on different focal lenghts ?

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I tested our 12" model on both f/4.7 and f/10 10 inch scopes. Although the spike pattern is slightly different, both provided the diffraction spike pattern. Here are 2 rough images I shot for comparison:

f/4.7 scope

f/10 scope

Both provided usable patterns. Note that both of these images were in scopes that weren't currently tracking, so these are very fast exposures and are not as clear as they could be. At the time I just wanted to get the basic tests done.

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John Wunderlin
Vendor - Spike-a Bahtinov Focusing Mask
Empire Ranch Observatory
Iowa County Astronomers

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