Quote:
Originally Posted by kinetic
Hi Dennis,
10 x 20sec on the LUM.....maybe try more?
I can easily reach 18-19mag with FL 1500mm and 12" aperture
but the DSI sensitivity I think and it's pixel/arc sec is the key.
Secondly....another angle might work too in combination with
the above: try resampling up to 2x with Bspline or other methods
before doing your processing.
Steve
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Hi Steve
Thanks for the helpful suggestions.
I was recording at an effective focal length of 5400mm (F30) by using the x2.5 Barlow and ran a series of exposures spanning 10 secs to 90 secs and so far, Miranda hasn’t turned up in any of them after a first pass through my processing routine.
Overall, 20 secs appeared to be optimum in terms of keeping objects (reasonably) sharp with such relatively lengthy exposures at 5400mm, whilst controlling the blow out of the disc of Uranus which can swamp the moons if closer than say, 6 to 8 arc secs. An exposure of 20 secs can also get me down to mag 17 at these longish focal lengths and Miranda is mag 16.55.
Last night was not particularly favourable for Miranda so I’ll keep looking ahead for a more favourable pairing. All good fun!
Cheers
Dennis