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Old 21-10-2015, 06:21 PM
LewisM
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MaxIM 3D plots

I am not sure what I am expecting to see in MaxIM regarding the 3D plot of star focus - is ANY degree of flat top "acceptable" or is the aim to get a pointed top showing a perfectly focused star image?

I am still hand-focusing, and am getting some pretty tight 3D plots, but do I need to aim for the pointed spire? (probably nigh on impossible hand focusing in the CFZ with an f/5 scope).

My Sharpsky will be up and running later this week.
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Old 21-10-2015, 06:35 PM
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Atmos (Colin)
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You think that's bad, I am trying to focus a F/3.76 guide scope
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Old 21-10-2015, 06:47 PM
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Flat tops do not indicate lack of focus. Generally it is the star saturating at the center.
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Old 21-10-2015, 07:00 PM
LewisM
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Thanks Peter. I wouldn't have thought that they would saturate that much in a 10 sec exposure on medium magnitude stars, even at f/5.
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Old 21-10-2015, 07:02 PM
LewisM
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Quote:
Originally Posted by Atmos View Post
You think that's bad, I am trying to focus a F/3.76 guide scope

One word -helical focuser. You can get one for around $70 and retrofit it to an 50mm tube finder etc. (old image, but same guidescope conversion)

Image below. makes life a breeze!
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Old 21-10-2015, 07:29 PM
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Atmos (Colin)
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Quote:
Originally Posted by LewisM View Post
One word -helical focuser. You can get one for around $70 and retrofit it to an 50mm tube finder etc. (old image, but same guidescope conversion)

Image below. makes life a breeze!
Already got one Only properly figured out how to use it yesterday afternoon so I haven't actually had a decent focus out in the field yet :/
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