A Little Bit Longer

In order to get a feel for how long an exposure is actually useful, I’ve been capturing more Ha data for NGC 6888. The following image is composed of 71 10-minutes subs.

Ha filtered image of the Crescent Nebula (NGC 6888) - Version 2
The Crescent Nebula (NGC 6888) – Version 2

Imaging Equipment: WO ZS 80 II ED, DSI Pro II, Razorback Cooler, Baader 7nm Ha filter, WO 0.8x Flattener II
Guilding: Orion 80mm ST, DSI Pro
Mount: CGE

The majority of the difference in appearance between this image and the one previous post can be attributed to a slight tweak to the image’s gamma. When they are displayed with the same settings, there is a very slight decrease in the noise apparent in the darker areas of the newer image, at least I think there is. I’m not certain I could tell the difference if I did not know which was which.

Here is the previous image with the same (approximately) gamma tweak.

Ha filtered image of the Crescent Nebula (NGC 6888) - Version 1 with gamma tweak
The Crescent Nebula (NGC 6888) – Version 1 with gamma tweak

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