My scope is indeed f8 but

Home Forums Spectroscopy LHires experience – and some issues… My scope is indeed f8 but

#579820
Kevin Gurney
Participant

My scope is indeed f8 but seeing here isnt brilliant, what with the urban heat dissipating etc…

Can you explain what you mean by ‘vignetting’ here? Do you mean the star disc spreads beyong the slit? For the stars I am looking at this is certainly the case. In this respect (star diameter vs slit width)  my guide images look liek the one Andy posted above.

Kevin