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Hi ! just wondering - I was looking to get the GSO 8 in. F/4 also for some A.P. I see GSO sell a 8in. F/5 [as sold by Andrews]. I had a 8in. F/4 many years ago for visual only so I am aware of the importance of collimation.
I was wondering if the F/5 version would be just that easier to collimate and keep collimated but would it still be 'fast' enough for A.P. ? unsure what the secondary mirror size is - the F/4 is 63 mm. I believe the F/5 may be smaller at 50 mm so unsure if this is enough for full illumination - but unable confirm what size it this.
Thanks for any thoughts
Chris
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