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Hi – the S.V Nighthawk is not the ED version it is a older well corrected achro. It actually is a great scope - built like a tank and very well finished with a very smooth 2 in. R and P. focuser. There is some CA on bright objects mainly on high mags. It can go to 150x on steady nights and gives sharp contrasty images. The WO ED66 is the Petzal design and has the FPL-51 glass – it really is a ‘semi APO’ and is labeled as such. It is about half way between the Nighthawk and my now sold Orion ED80 / ED100 when it comes to CA correction. The achro S.V.Nighthawk and W.O. ED66 Petval are no longer made.
The Skywatcher Equinox [same as Orion EON] ED120 - which replaced the two Orion ED's - has a F.L of 7.5 also gives remarkably CA free images. This scope is capable of AP and produces flat images without the need for a focal reducer. I much prefer the planetary visual images through the ED120 then the Meade 8 in SCT. It gives 85-90 % performance as my friends TV127 APO which is over 3x' s the price.
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