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Peter: I've arranged to return this scope in lew of the F8/F9 issue anyway so we'll see how the next one goes and collimate it on arrival. Thanks for the 10/20% tip too. worked a treat.
Stuart: Isnt the only way to tell the F/ratio of these by imaging and comparing the FOV? This is only due the the lack of GSO markings on the tube (would a sticker hurt it?)
Grahame.
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