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going out of focus?

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#1 James Cunningham

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Posted 05 June 2013 - 01:24 PM

I have had my scope about 3 years now. Last night was the first time that I got a good focus at the beginning of the session but by the end of the session only 2 hours later, the scope was pretty far out of focus. Anyone else run into this problem after only 2 hours? Thanks.
Jim

#2 MikeBOKC

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Posted 05 June 2013 - 04:03 PM

I don't think it is focus. More likely cooldown and changes in seeing. I find the need to fine tune focus frequently throughout a night depending on atmospheric conditions and what part of the sky I may be aimed at.

#3 FXDX

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Posted 06 June 2013 - 12:49 PM

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#4 jerwin

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Posted 06 June 2013 - 09:10 PM

Focus or alignment? I refocus each eyepiece, so i'm making adjustments all night.

#5 James Cunningham

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Posted 08 June 2013 - 05:48 AM

Its the focus. My alignments stay on target. I use a camera so I don't change eyepieces.


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