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Thanks Ray,
I see mine is 305 mm vs gso at 302 according to bintel stats.
I was presuming 1500/305= F4.9 therefore 302*F5= 1510mm and realistically that's not going to give me enough in focus at this time anyway.
I find my scope awesome for visual, so if I mod it at all it would probably only be a low profile focuser.
For now I'll just play with my SW120 at F5 for photography untill I grasp the basics.
Regards
James
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