Re: [M]: Focal length question
| Subject: | Re: [M]: Focal length question |
| From: | R. A. Greiner |
| Date: | Wed May 31 12:03:26 2000 |
Douglas LePage wrote:
>
> Hey Dragan,
> The question stems from the fact that the F/6.3 collimator screws are 5
> times longer than those for the F/10...why? Deeper figure? Ok but why the
> longer screws? You listening, Doc?
> Doug
>
> -----Original Message-----
> From: owner-mapug@shore.net [mailto:owner-mapug@shore.net]On Behalf Of
> Sirius76@aol.com
> Sent: Tuesday, May 30, 2000 9:44 PM
> To: mapug@shore.net
> Subject: Re: [M]: Focal length question
>
> Ive heard different. To my understanding, both primaries are figured to
> f/2.
>
> Its the difference in the secondaries that determines which scope is an
> f/10
> or f/6.3.
>
> I might be wrong, so please correct me if im wrong,
>
> Clear skies
> Sirius76
> Dragan
> NiastroHome
>
> The mirror has a deeper figure.
> AV
>
> On Fri, 26 May 2000 16:29:29 -0700 "Douglas LePage"
> writes:
> > Hi all,
> > What makes the focal length of the f/6.3 shorter than the f/10. Is
> > it
> > because they place the secondary a little closer to the primary?
> > Doug
> >
> >
I have been listening, but I do not know the answer. I have actually
got both a 12" f 10 and 10" f 6.3. I will try to find out the
details. The suggestion that the primary mirrors are the same but the
secondaries are different make a lot of sense. This would reduce
inventory of primaries and reduce costs. But I really do not know the
truth in this case. If anyone knows the facts, I too would like to
know.
Doc G
>
> Hey Dragan,
> The question stems from the fact that the F/6.3 collimator screws are 5
> times longer than those for the F/10...why? Deeper figure? Ok but why the
> longer screws? You listening, Doc?
> Doug
>
> -----Original Message-----
> From: owner-mapug@shore.net [mailto:owner-mapug@shore.net]On Behalf Of
> Sirius76@aol.com
> Sent: Tuesday, May 30, 2000 9:44 PM
> To: mapug@shore.net
> Subject: Re: [M]: Focal length question
>
> Ive heard different. To my understanding, both primaries are figured to
> f/2.
>
> Its the difference in the secondaries that determines which scope is an
> f/10
> or f/6.3.
>
> I might be wrong, so please correct me if im wrong,
>
> Clear skies
> Sirius76
> Dragan
> NiastroHome
>
> The mirror has a deeper figure.
> AV
>
> On Fri, 26 May 2000 16:29:29 -0700 "Douglas LePage"
> writes:
> > Hi all,
> > What makes the focal length of the f/6.3 shorter than the f/10. Is
> > it
> > because they place the secondary a little closer to the primary?
> > Doug
> >
> >
I have been listening, but I do not know the answer. I have actually
got both a 12" f 10 and 10" f 6.3. I will try to find out the
details. The suggestion that the primary mirrors are the same but the
secondaries are different make a lot of sense. This would reduce
inventory of primaries and reduce costs. But I really do not know the
truth in this case. If anyone knows the facts, I too would like to
know.
Doc G
