John A Roberts
Well-known member
Hi Henry (post #78),
Just to clarify about the 460 mm objective focal length . . .
Prior to the introduction of the C series telescopes, all the fixed body and draw tube models had a focal length of 460 mm,
as is shown in the page from the 2005 catalogue.
But, I’ve not seen any indication that the length is shared by the modular X series telescopes.
And since the designers would have started from scratch, perhaps they used another figure,
one that better fitted in with various design considerations?
John
Just to clarify about the 460 mm objective focal length . . .
Prior to the introduction of the C series telescopes, all the fixed body and draw tube models had a focal length of 460 mm,
as is shown in the page from the 2005 catalogue.
But, I’ve not seen any indication that the length is shared by the modular X series telescopes.
And since the designers would have started from scratch, perhaps they used another figure,
one that better fitted in with various design considerations?
John