UVEX optimal telescope focal ratio

[Dubreuil Pierre]

Good evening Bernard

I think the G600 grating is a good resolution / magnitude compromise

Yes, I forgot to specify, G600 at 750nm.
I am going to order a G1200 400nm, the G600 does not exist!
I already have a slightly damaged G1200 500nm
I also have a 300tr / mm 500nm.

UVEX (4) also has the rotating slit 23µ 50µ 100µ ...

Grating G1200 and slit 50µ for comets will be great, I think,foor a new year !

I wish you good sky for the new year

Pierre