Re: [ATM] Width of Dome Slit?

["Nils Olof Carlin" <nilsolof.carlin@telia.com>]

hello Niels,

As I can think of it, a slit only admitting the field of the 14" could 
always be positioned in front of the telescope no matter where aimed, but if 
you can't center the telescope and dome, the positioning may be very 
irregular, and a sidereal rate of rotation won't do! In principle, a 
computer could do the positioning if fed the aim of the telescope, else you 
must do it manually which may detract from observation. An interesting 
problem - those are the principles I could think of right away,

Nils Olof

> Does that mean that the slit of the dome needs to be 2 x 57.1 cm =
> 114.2 cm (45"); at least when observing close to Zenith, to avoid
> vignetting from the slit?
>
> I think this is a very wide slit if the diameter of the dome is, say,
> 300 cm (118"). That is 38% of the diameter of the dome.
>
> What am I missing? Or do people live with that vignetting?
>
> Best regards,
>
> Niels Foldager


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