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G day Scott,
re beams of light; i have similar issues in dewy tropical Qld especially on bright objects. Mars was particularly frustrating me until i got a period of ?dry air ?good seeing and WOW.
i'll watch to see what the more experienced IISers here contribute; but assuming reasonable collimation and reasonably clean glass i think my issues and maybe your's are:-
mostly due to humid air/dew points,
warm breath on the colder ep lense (i imagine a bigger prob in Tas),
film on ep espec after outreach nights,
secondary mirror fogging/dewing,
and i have had the primary fog over also.
i have found clearing them with a 12v hairdryer is a very temporary result and will be getting some dew heater straps. warming the eps in front of the stove works and alternating eps through my pockets also helps. I read a while back of IISers having a red light and or heater strap in the ep case for this purpose.
regards, L
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