Re: f-stop question

From: Llanzlan Klazmon the 15th <Klazmon@xxxxxxxxxxxxxxxx>
Date: 2 Jul 2007 15:12:10 +1200

"goodnigh" <goodnigh1@xxxxxxxxxxxxxx> wrote in news:DRYhi.3032$tj6.44
@newsread4.news.pas.earthlink.net:

Will be buying a 10 inch 1200mm f4.5 Dob.
After experimenting with inexpensive GoTo scopes,
I have decided to "GoTo" basic star hopping.
Somewhere I read there is an issue with fast scopes.
Just can't remember what they are.

mike

In the case of a newtonian like this a faster f ratio implies more off axis
coma and greater sensitivity to accurate collimation. Exit pupil might be a
problem if you plan to use 30mm or greater fl eyepieces.

Klazmon

Follow-Ups:
- Re: f-stop question
  - From: Margo Schulter
- Re: f-stop question
  - From: goodnigh

References:
- f-stop question
  - From: goodnigh

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Re: f-stop question
... After experimenting with inexpensive GoTo scopes, ... I have decided to "GoTo" basic star hopping. ... Somewhere I read there is an issue with fast scopes. ...
(sci.astro.amateur)
f-stop question
... Will be buying a 10 inch 1200mm f4.5 Dob. ... After experimenting with inexpensive GoTo scopes, ... I have decided to "GoTo" basic star hopping. ...
(sci.astro.amateur)
Re: f-stop question
... After experimenting with inexpensive GoTo scopes, ... Somewhere I read there is an issue with fast scopes. ... coma and greater sensitivity to accurate collimation. ... Remember that coma is only an issue off axis and a 10" scope will show a ...
(sci.astro.amateur)