Quote:
Originally Posted by strongmanmike
Thanks Suavi 
That's a difficult question, my 12" is F3.8 while the 4.2" FSQ is F5, so technically the FSQ is slower but it is hard to compare depth and cleanliness of an image, as wide field imaging can reveal extended objects quite well and give the impression of going deeper than the narrow field instrument because the extended object looks more compact and can appear brighter. Both systems get clean images quickly and both cameras are low noise (the SXH694 ridiculously so) but I am no Ray Shiraz on the comparative technicalities of this....Hopefully he chimes in, make an interesting discussion 
Mike |
It really boils down to aperture rules. The Newt for sure is faster. My Honders is undoubtedly faster than an FSQ. FSQ is plenty fast though Most widefield scenes are fairly bright to begin with. But the 694 sensor is only receiving a small part of the total illuminated circle the scope is capable of so to that degree the large sensor is receiving most of the light gathered by the FSQ whereas the 694 is missing large amounts of the gathered light.
Even so the 694 has higher QE especially in the narrowbands where its around 50% more sensitive.
Greg