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Focus
Hi,
I've been reading about Bahtinov masks, and have just had a revelation (or at least, understood something very basic about focus).
If I'm moving from object to object, I re-focus each time. However, some observers using a Bahtinov mask describe reaching focus with the mask, and then beginning to observe/image.
Leaving aside adjustments needed when doing long exposures and precise imaging, is it the case that once focus is achieved on a star then all other objects will be focused?
I can understand the idea that all other stars will be focused, being ostensibly infinite points, but what about planets?
I know this is probably a very elementary question, but it's something I've not considered until now...
Cheers
Stephen
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