View Single Post
  #12  
Old 04-02-2011, 02:41 PM
gregbradley's Avatar
gregbradley
Registered User

gregbradley is offline
 
Join Date: Feb 2006
Location: Sydney
Posts: 18,183
Interesting image Louie. Is this scope a Petsval like the FSQ? I wonder if they plan larger apertures. I am surprised Tak does not bring out an FSQ125. I know they have their TOA series but the FSQ is their best seller surely.

As far as star sizes go that is tricky. I find myself the best star sizes usually come from larger apertures and bigger chips. Small apertures often get larger stars?? Even the FSQ106ED with its reducer gets larger stars than I would have hoped. I think you get better star sizes with the FSQ at its native focal length.

Of course seeing and focus play a big part here. Did you use an electronic focuser? It is hard to get exact focus with Petsval scopes without one and the faster the scope the smaller the critical focus zone.
A small bit off and the FSQ with reducer star sizes can be nearly 50% bloated.


Greg.
Reply With Quote