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Old 09-11-2012, 09:54 AM
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graham.hobart (Graham stevens)

graham.hobart is offline
Join Date: Nov 2008
Location: hobart, tasmania
Posts: 2,031
changing Focal length

Just a simple question I hope-
When running a focus run with TCF (optec) in Maxim DL - the focal length/ratio has to be spot on. I am curious as to whether this is as advertised on the side of my scope (f7/900mm) or should I be changing this as I have the added length of the focuser between the scope and sensor?
I wondered whether this would affect then the accuracy of my focus and also image scale for calculations in Maxim as I would soon like to plate solve?

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