Re: First Light & Question
Bob Luffel (bobl@gr.hp.com)
Mon, 27 Mar 95 11:17:47 MST
>
> >I came up about 0.3 inch short on my expected in-travel.
>
>
> >(The mirror) was marked as 59" focal length and I asked and was told
> it was 59.0" "exactly". I would assume +/- 0.1 inches.
>
>
> I make the sagitta of a 10" f/5.9 mirror to be .21 inches.
> If the manufacturer measures from the center of the mirror and
> you measured from the edge, that is most of the discrepancy.
> Probably the rest is just error.
>
> Tom Clarke
>
>
Actually, the sagitta for a 10" f/5.9 (radius of 118 inches) is
half that, 0.106".
Bob