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Old 29-03-2021, 12:55 PM
TrevorW
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Focusing

A very important issue when imaging but of late I've had some issues getting it right due to deteriorating eyesight, presently I use a Bahtinov mask in conjunction with my capture software focusing aid in EZCAP QT, however even following guidelines by picking a star of around mag 7 then using the mask to get the spikes split perfectly the software is still returned FWHM figures of around 20-30 even those this is binned 2x2 still that seems excessive am I doing something wrong or is the software just returning erroneous figures.
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Old 30-03-2021, 05:01 PM
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rustigsmed (Russell)
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Hi trevor i know a lot of people dont do it but you could use a brighter star? is the FWHM while the bahtinov is on?
also another option is to refocus about every hour if you can. temp change and focus slip can make things blurry pretty quickly.
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Old 30-03-2021, 08:53 PM
TrevorW
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Quote:
Originally Posted by rustigsmed View Post
Hi trevor i know a lot of people dont do it but you could use a brighter star? is the FWHM while the bahtinov is on?
also another option is to refocus about every hour if you can. temp change and focus slip can make things blurry pretty quickly.



yeah thats figure i get with or without mask thanks
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