sensasi: [sct-user] Re: Curious about f/

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Jumat, 08 Februari 2008

[sct-user] Re: Curious about f/

--- In sct-user@yahoogroups.com, "Terry" <m52z@...> wrote:
>
> I'm assuming that the LX200(GPS/R) is f/10 when the back is loaded with
> the standard equipment (stock microfocuser, diagonal, and eyepiece).
>
> IF THIS IS SO, then how many inches (or fraction) can the mirror move
> forward (28 threads per inch) for every increase in f/?
>
> For example, I have to move my mirror forward an additional 11 focus
> turns (11/28") to focus my .6x focal reducer. What is the effective f/
> with this mirror movement? OR, to put it more simply, an effective f/
> of 11 is a forward movement of the mirror of how much?
>
> Inquiring mind wants to know.
>
>

This report:

http://tinyurl.com/3xw2mg

has the data you need. Unfortunately it is buried in the tables near
the end, not nicely charted and it covers only Celestron SCTs. But it
will give you an idea what your Meade will do.

Ken

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