David's Astronomy Pages Notes - Session 296 (2008-07-23) Notes (S285)   Notes (Main)   Home Page   Notes (S301)

Goto Images from 2008-07-23

Temperature Coefficient - LX200 8"

Based on focus measurements from sessions S267 to S296,  a revised temperature coefficient of -143.1 steps per deg C has been estimated for my LX200 telescope normal setup (LX200 8", f/10 - operating at f7.4 , focal length 1498mm) .  This is equivalent to a focus change of 0.0122"/degC  (based on TCF-S step size of 0.000085")

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