Author: mo12mo12 Date: Jun 16, 2008 10:13
On Jun 16, 6:48 am, jerry warner mchsi.com> wrote:> mo12 wrote:
>> I have ourchased at little cost an assembly that could be described as
>> a Ritchey-Chrétien
>> telescope.
>> 8in main mirror 5in secondary both with fairly deep concave
>
> 8in primary, 5in secondary?
>
>> curvature.
>> Folded focal length probably about 18 in.
>> Secondary mirror has a nice position adjustment on a rack built into
>> the cast light alloy casing on Naval type construction.
>> Curiosity in hole in the centre of the secondary lineing up with hole
>> in bigger primary mirror.
>> Assembly Throws a nice focussed flat field image about 2 in behind t
>> primary mirror.
>> No baffles. External light probably contaminates deep sky images.
>> My eyepieces just seem to show the back of the secondary
>> What was it for? ...
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