Sky at Night Magazine - - ASTROPHOTO­GRAPHY CAPTURE -

Slew your tele­scope to a medium-bright star half-way up the sky. Care­fully de­fo­cus to re­veal the star’s dif­frac­tion rings. Cen­tre the de­fo­cused star and as­sess how sym­met­ri­cal the rings are. Con­sult your tele­scope’s man­ual for col­li­ma­tion in­struc­tions and ad­just un­til the rings ap­pear sym­met­ri­cal.

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