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M8 + M28
from reddit thread:
https://old.reddit.com/r/AskAstrophotography/comments/14wxnjo/what_did_i_do_wrong_with_this_process_of_the/
canon 800d. svbony 80mm triplet i think its 480 mm focal length.
140 raw files evaluated. Only images IMG_0106.CR2 - IMG_0173.CR2 have good focus. Of these many are trailed, so only 38 used.
x's are trailed and not used:
IMG_0106.CR2 Tue Jul 11 22:34:49 2023 800 59.5 f/inf 0.0 T= 19
IMG_0108.CR2 Tue Jul 11 22:36:30 2023 800 59.5 f/inf 0.0 T= 19
IMG_0109.CR2 Tue Jul 11 22:37:31 2023 800 59.2 f/inf 0.0 T= 18
IMG_0110.CR2 Tue Jul 11 22:38:32 2023 800 59.0 f/inf 0.0 T= 17
IMG_0111.CR2 Tue Jul 11 22:39:32 2023 800 59.2 f/inf 0.0 T= 17
X IMG_0112.CR2 Tue Jul 11 22:40:33 2023 800 59.2 f/inf 0.0 T= 17
X IMG_0113.CR2 Tue Jul 11 22:41:34 2023 800 59.1 f/inf 0.0 T= 17
X IMG_0114.CR2 Tue Jul 11 22:42:35 2023 800 59.0 f/inf 0.0 T= 17
IMG_0115.CR2 Tue Jul 11 22:43:35 2023 800 59.2 f/inf 0.0 T= 16
IMG_0116.CR2 Tue Jul 11 22:44:36 2023 800 59.1 f/inf 0.0 T= 16
x IMG_0117.CR2 Tue Jul 11 22:45:37 2023 800 59.0 f/inf 0.0 T= 16
IMG_0118.CR2 Tue Jul 11 22:46:37 2023 800 59.2 f/inf 0.0 T= 16
IMG_0119.CR2 Tue Jul 11 22:47:38 2023 800 59.2 f/inf 0.0 T= 16
IMG_0120.CR2 Tue Jul 11 22:48:39 2023 800 59.0 f/inf 0.0 T= 16
IMG_0121.CR2 Tue Jul 11 22:49:40 2023 800 59.2 f/inf 0.0 T= 16
X IMG_0122.CR2 Tue Jul 11 22:50:40 2023 800 59.2 f/inf 0.0 T= 16
IMG_0123.CR2 Tue Jul 11 22:51:41 2023 800 59.2 f/inf 0.0 T= 16
IMG_0124.CR2 Tue Jul 11 22:52:42 2023 800 59.0 f/inf 0.0 T= 16
IMG_0125.CR2 Tue Jul 11 22:53:43 2023 800 59.1 f/inf 0.0 T= 16
IMG_0126.CR2 Tue Jul 11 22:54:43 2023 800 58.9 f/inf 0.0 T= 15
IMG_0127.CR2 Tue Jul 11 22:55:44 2023 800 58.7 f/inf 0.0 T= 15
IMG_0128.CR2 Tue Jul 11 22:56:45 2023 800 58.7 f/inf 0.0 T= 15
X IMG_0129.CR2 Tue Jul 11 22:57:45 2023 800 59.2 f/inf 0.0 T= 15
IMG_0130.CR2 Tue Jul 11 22:58:46 2023 800 59.2 f/inf 0.0 T= 15
IMG_0131.CR2 Tue Jul 11 22:59:47 2023 800 59.0 f/inf 0.0 T= 15
X IMG_0132.CR2 Tue Jul 11 23:00:47 2023 800 59.2 f/inf 0.0 T= 15
X IMG_0133.CR2 Tue Jul 11 23:01:48 2023 800 59.2 f/inf 0.0 T= 15
X IMG_0134.CR2 Tue Jul 11 23:02:49 2023 800 59.1 f/inf 0.0 T= 15
X IMG_0135.CR2 Tue Jul 11 23:03:50 2023 800 59.0 f/inf 0.0 T= 15
IMG_0136.CR2 Tue Jul 11 23:04:50 2023 800 59.2 f/inf 0.0 T= 15
X IMG_0137.CR2 Tue Jul 11 23:05:51 2023 800 59.2 f/inf 0.0 T= 15
IMG_0138.CR2 Tue Jul 11 23:06:52 2023 800 59.0 f/inf 0.0 T= 15
X IMG_0139.CR2 Tue Jul 11 23:07:53 2023 800 59.1 f/inf 0.0 T= 15
IMG_0140.CR2 Tue Jul 11 23:08:54 2023 800 58.6 f/inf 0.0 T= 15
IMG_0141.CR2 Tue Jul 11 23:09:54 2023 800 58.9 f/inf 0.0 T= 15
IMG_0142.CR2 Tue Jul 11 23:10:55 2023 800 58.9 f/inf 0.0 T= 15
IMG_0143.CR2 Tue Jul 11 23:11:55 2023 800 59.2 f/inf 0.0 T= 15
X IMG_0144.CR2 Tue Jul 11 23:12:56 2023 800 59.1 f/inf 0.0 T= 15
X IMG_0145.CR2 Tue Jul 11 23:13:57 2023 800 58.9 f/inf 0.0 T= 15
X IMG_0146.CR2 Tue Jul 11 23:14:58 2023 800 58.9 f/inf 0.0 T= 15
IMG_0147.CR2 Tue Jul 11 23:15:58 2023 800 58.9 f/inf 0.0 T= 15
X IMG_0148.CR2 Tue Jul 11 23:18:25 2023 800 59.5 f/inf 0.0 T= 17
IMG_0150.CR2 Tue Jul 11 23:20:08 2023 800 59.5 f/inf 0.0 T= 17
X IMG_0152.CR2 Tue Jul 11 23:21:38 2023 800 59.5 f/inf 0.0 T= 17
X IMG_0154.CR2 Tue Jul 11 23:23:12 2023 800 59.5 f/inf 0.0 T= 16
IMG_0155.CR2 Tue Jul 11 23:24:14 2023 800 59.1 f/inf 0.0 T= 16
IMG_0156.CR2 Tue Jul 11 23:25:15 2023 800 58.7 f/inf 0.0 T= 16
IMG_0157.CR2 Tue Jul 11 23:26:15 2023 800 59.1 f/inf 0.0 T= 15
IMG_0158.CR2 Tue Jul 11 23:27:16 2023 800 58.7 f/inf 0.0 T= 15
X IMG_0159.CR2 Tue Jul 11 23:28:17 2023 800 58.7 f/inf 0.0 T= 15
IMG_0160.CR2 Tue Jul 11 23:29:17 2023 800 58.9 f/inf 0.0 T= 15
X IMG_0161.CR2 Tue Jul 11 23:30:18 2023 800 58.9 f/inf 0.0 T= 15
IMG_0162.CR2 Tue Jul 11 23:31:19 2023 800 58.6 f/inf 0.0 T= 15
IMG_0163.CR2 Tue Jul 11 23:32:20 2023 800 58.7 f/inf 0.0 T= 15
X IMG_0165.CR2 Tue Jul 11 23:34:21 2023 800 59.2 f/inf 0.0 T= 15
X IMG_0166.CR2 Tue Jul 11 23:35:22 2023 800 59.1 f/inf 0.0 T= 15
IMG_0167.CR2 Tue Jul 11 23:36:23 2023 800 58.7 f/inf 0.0 T= 15
IMG_0168.CR2 Tue Jul 11 23:37:23 2023 800 59.2 f/inf 0.0 T= 15
X IMG_0169.CR2 Tue Jul 11 23:38:24 2023 800 59.2 f/inf 0.0 T= 15
IMG_0170.CR2 Tue Jul 11 23:39:24 2023 800 59.1 f/inf 0.0 T= 15
X IMG_0171.CR2 Tue Jul 11 23:40:25 2023 800 59.1 f/inf 0.0 T= 15
X IMG_0172.CR2 Tue Jul 11 23:41:26 2023 800 59.0 f/inf 0.0 T= 15
Thus, almost 50% rejection rate.
Images raw converted in photoshop CS6 ACR, no flats, no darks, no bias used.
38 images stacked in DSS, save file as m8+m20-reddit-ilovepopalah-IMG_0106-173-av38.a.tif Result in Figure 1.
Figure 1. Stacked light frames (raw converted in photoshop), stacked in DSS.
Color preserving stretch with rnc-color-stretch
using the latest version, 1.01 here:
rnc-color-stretch-v1.01
Astrophotography Made Simple, a 5 Step Post Processing Work Flow:
Notes on the Figure 2 image:
Hydrogen emission is pink/magenta (fades to red in presence of interstellar dust).
Oxygen emission is Teal (bluish-green).
Blue in M8 and core of M20 is oxugen + hydrogen emission.
Interstellar dust is reddish brown.
Blue on the left (north) of M20 is a reflection nebula.
Many beautiful star colors.
Chromatic aberration was not corrected, as eve in these images, focus was off.
Figure 2. Final image.
rnc-color-stretch commands:
rnc-color-stretch m8+m20-reddit-ilovepopalah-IMG_0106-173-av38.a.tif -rootpower 20 -skylevelfactor 0.005 -scurve1 curve1 -display -obase m8+m20-reddit-ilovepopalah-IMG_0106-173-av38.b
Second run:
rnc-color-stretch m8+m20-reddit-ilovepopalah-IMG_0106-173-av38.b.tif -rootpower 10 -skylevelfactor 0.005 -scurve1 histogrambox1 2608 1282 3007 1591
-obase m8+m20-reddit-ilovepopalah-IMG_0106-173-av38-c
Last updated July 12, 2023.