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Old 02-11-2016, 08:49 AM
mikeyjames (Mick)
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mikeyjames is offline
 
Join Date: Aug 2016
Location: Milperra
Posts: 178
Focus in Centre of FOV question

Hi all,
Last night when I was looking at Venus I noticed that the view was very crisp everywhere in the FOV except the very centre. Then when I attached my 5x Powermate it really exacerbated the issue. There seemed to be a faint outline of the donut in the centre of the FOV and whenever Venus was within the donut it was out of focus but anywhere out of the donut it looked nice and crisp.

Then a little later on with Saturn same issue but not as bad.

I had checked collimation earlier in the evening and it seemed spot on.

Anyone know what could be causing this?

Thanks
Mick
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