Quote:
Originally Posted by strongmanmike
True, I did indeed  ...just in reference to the faint tidal stream.
I think that 32" scope is also a bloody purler too and a corrected Cassegrain, I recon they are better than RC's and can be made to higher perfection  ...then there is the site of course 
Mike |
Hi Mike,
I remember reading somewhere that a classical Cassegrain can be corrected
to be superior to a Ritchey-Chrétien.
Quote:
Originally Posted by Atmos
As for AO, deformable mirrors are actually more difficult in a 32" telescope than the telescopes they're traditionally used on which have secondary mirrors LARGER than 32" 
On the consumer level AO like what some of us mere mortals use, they work at there best when under the seeing conditions that us mere mortals are using them under. AO from SBIG and SX not only correct for tracking errors (this is their biggest correction), on nights of what WE would consider good seeing they also help correct for the slower moving convection currents within the atmosphere. These tend to be on the scale of a few seconds rather than the 10ms timescales that wavefront correctors are made at. The CHART-32 team rarely have to deal with these kinds of convection currents as they've above them. |
Thanks Colin,
I didn't know about correction of slower moving convection currents.
I'm not sure but I think deformable mirrors only correct for a tiny portion of the observable field?
In other words it might be good for splitting a double star but
not for a whole picture.
cheers
Allan