#21  
Old 05-06-2016, 09:57 PM
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rmuhlack (Richard)
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blending short and long subs (a la HDR) is certainly a way to get more dynamic range. Not sure if you can x2 bn with a colour sensor though. might be best to try with a shorter focal length scope if you want to put the ASI towards deep sky targets.
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  #22  
Old 05-06-2016, 10:52 PM
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astronobob (Bob)
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Quote:
Originally Posted by rmuhlack View Post
blending short and long subs (a la HDR) is certainly a way to get more dynamic range. Not sure if you can x2 bn with a colour sensor though. might be best to try with a shorter focal length scope if you want to put the ASI towards deep sky targets.
Short F/L, is this to avoid what they call, oversampling ?
I am going to use with 12" F10 close and personal to galaxies - if seeing is good, could get lucky ?
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Old 07-06-2016, 10:13 AM
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Camelopardalis (Dunk)
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Don't be afraid to use a reducer with these small sensors. What you might lose in resolution is made up for by increased image brightness.
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Old 07-06-2016, 10:15 PM
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rmuhlack (Richard)
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Another image to indicate the potential for high sensitivity imaging with short subs and no guiding, made possible by low noise sensors. This is 1187 x 5sec subs with a Sony IMX264 sensor (Point Grey Chameleon 3) and a Astronomik L filter. Gain of 15db. Scope was a 80mm f6 achromat, mount was a HEQ5. Captured with Firecapture, stacked in Autostakkert, followed by a histogram stretch and quick curve adjustment in Pixinsight. This camera does not (currently) have cooling. Sensor temp of approx 27C throughout the capture
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Old 07-06-2016, 11:07 PM
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billdan (Bill)
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That's really clean and sharp Richard, no hint of any background noise. If you don't mind stacking lots of short subs, probably no need to cool the camera down at all.

Cheers
Bill
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Old 08-06-2016, 06:29 AM
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Shiraz (Ray)
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Extreme imaging, really pushing the boundary - you must be very happy with that.
Well done.
round stars and a galaxy using an HEQ5, an achro and no guiding - very appealing
be very interested to see what your Newtonian can do.

Last edited by Shiraz; 08-06-2016 at 07:51 AM.
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Old 08-06-2016, 04:09 PM
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Impressive Richard - looking on with much interest
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