Telescope Reviews: Re: CPC1100 Focal Length: Range?

Hi Alex,

I'd be interested in this, too. I know that the FRFF, like most optical adjusters, varies its effect depending upon the distance from the two other optical components, the EP and the OTA optics.

If you have your FRFF positioned slightly outside the optimum distance this can affect your actual focal ratio. I was talking with Ron at Moonlite the other day, and they calculate the sweet spot as 3" from the EP to the FRFF. I suspect when we get somebody here who actually knows what he's talking about, we'll find this distance issue is at the heart of your conundrum.

Sorry I don't have a specific answer for you, but I appreciate your posing the question because I think a lot of folks will learn something from this thread.

Regards,

Terry

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Edited by letimotif (05/18/08 11:33 AM)

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