Quote:
Originally Posted by Shiraz
You don't just get "the Barlow" that works on all imaging systems - your Barlow must be chosen to match both your scope and the chip that you decide on - there will be quite different solutions for different cameras and scopes.
As I see it, with that scope, your options are:
D..K21 618 - well tried and dependable - fairly large pixels so you will need a final FNo of about f28 - get there with about a 4x Barlow with your scope (suggest 3x with extension tube). Then you will have a setup much like the one that Franck uses so effectively.
QHY5L2/ASI120 - quite new cameras, but some imagers are producing very good results with them. these have smaller pixels than the DBK/DMK and do not need so much magnification - 2.5x Barlow is about right with your scope (suggest 2x with extension tube).
Neximage5 - relatively untried, but has high spec chip - has tiny pixels and only needs a final FNo of about f11. - you can get there with a 1.5x Barlow.
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Thanks again Ray. Big effort mate. Sorry I'm slow to convince sometimes. I just don't want to spend big dollars and get the wrong combination.
Anyone have any reasonable grounds to dispute this? If so, why?