Thanks for the great feed back guys,
Quote:
Originally Posted by SimmoW
Nice & good comparison pics. Wow, 30 min subs with an SLR! Is it cooled?
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My DSLR is not cooled it only has the IR filter replaced with a clear piece of glass... During the exposures, in Orion and the Horsehead previously, APT reported the the sensor was at 21 - 26 degrees C and granted there is a fair amount of noise on the subs.
I found that when converting the RAW CR2 subs in Photoshop RAW converter the plugin, as opposed to using DPP, it does a really good job of removing the noise. I did the same to the dark frames and subtracted those in Nebulosity 3, resulting in a very clean sub image...
Attached are two JPG converts from TIFFs converted from CR2 in DPP and PS CS4, no noise reduction other than what the plug in did by default.
Quote:
Originally Posted by rmuhlack
curious as to your setup for narrowband with a DSLR ? are you using clip in filters, or do you have a filterwheel setup in front of the camera?
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I use a filter wheel before the DSLR, and the filter sizes I use are the 1.25" type... it does not cause as much of a vignetting effect on a APS-C camera as a lot of forums claim it does. Attached a pic of the setup I used to get the subs on this orion nebula pic.
Clear skies,
Mariusz