Or he could use a really good sensitive OSC CCD like the SX M25C or M26C...
With respect, the read noise for those two cameras are very high compared to modern CMOS cameras, meaning he would be forced into longer subs. In his light polluted environment, many short subs from an ultra low read noise camera is going to beat sky glow to a large extent.
And at that RASA focal length, 620mm, smaller pixels have a lot to offer in terms of resolution,imho.
With respect, the read noise for those two cameras are very high compared to modern CMOS cameras, meaning he would be forced into longer subs. In his light polluted environment, many short subs from an ultra low read noise camera is going to beat sky glow to a large extent.
And at that RASA focal length, 620mm, smaller pixels have a lot to offer in terms of resolution,imho.
With a fast scope and heavy light pollution sky limited subs will be short on a CCD camera too and there will be negligible difference in the outcome.
Smaller pixels may be more suitable depending on the resolution/FOV trade off that David is looking for, but they will also collect signal more slowly.
Wow, how long are your subs going to be, like 10 sec ?
With my ASI071 I'm totally swamping read noise with 60-90 sec subs at F5.9 - buts that's in outer Sydney suburbs.
Wow, how long are your subs going to be, like 10 sec ?
With my ASI071 I'm totally swamping read noise with 60-90 sec subs at F5.9 - buts that's in outer Sydney suburbs.
well the other part of the puzzle arrived today - the specialised light pollution filter for the RASA
Good to see Celestron offering this filter. One of the big issues with ultra fast scopes like the RASA and HyperStar conversions, is the problems that emerge using standard filters, particularly narrowband ones and LPs, as the fast ratio light angles can be somewhat blocked by standard filters and can slew spectrum ranges outside the norms.