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Leon, are you planning on doing long exposures on a tracking mount or is this the static tripod shot you were asking about the other day?
If it’s just a tripod shot then just keep it simple.
Pre focus your lens during daylight, put some BluTack on the focus ring so it doesn’t move like Warren - Crater101 mentioned and have fun.
On a tripod, you’re only going to be doing 4.5 sec exposures anyway.
Unless you go tracked long exposures, I wouldn’t go to the trouble of Bahtinov masks and laptops…
RB
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