{"id":1043,"date":"2016-07-29T21:52:20","date_gmt":"2016-07-29T20:52:20","guid":{"rendered":"https:\/\/astrophotos.se\/?p=1043"},"modified":"2025-04-20T09:31:13","modified_gmt":"2025-04-20T08:31:13","slug":"asi1600mm-cool-test","status":"publish","type":"post","link":"https:\/\/astrophotos.se\/?p=1043","title":{"rendered":"ASI1600MM-COOL test"},"content":{"rendered":"
\"M27Test2_LRVB_Test3\"<\/a>
M27 luminance with ASI1600MM-COOL, RGB with Canon EOS600Da<\/figcaption><\/figure>\n

2016-07-28 23:30-01:00
\nClear, no moon, no wind, 12 degrees C<\/p>\n

2016-08-02 00:00-02:00
\nLow clouds, no moon, no wind, 10 degrees C<\/p>\n

2016-10-03 21:00-03:30
\nSome initial high clouds, some wind, 85% humidity, 5 degrees C<\/p>\n

Took some more test luminance frames on 2016-07-28, 2016-08-02 and 2016-10-03 to decide upon gain, offset and exposure time. Added RGB\u00a0from previous DSLR image of same object, see\u00a0https:\/\/astrophotos.se\/?p=600<\/a><\/p>\n

66x30s+17x60s+9x90s+19x120s+8x180s+26x240s+3x300s exposures with ASI1600MM-COOL and IDAS LPS-D1 filter used for luminance (224.5 minutes total exposure) taken with gain 77, offset 12 and gain 100, offset 17 settings of the camera cooled to -20C. 16x300s+8x240s+9x180s exposures with Canon EOS600Da used for RGB (139 minutes total exposure for RGB)<\/p>\n

With gain 77\u00a0setting, the 120s exposures seem to be optimal (with some caveat since the sky was not fully dark). With gain 100, offset 17 I could not see any difference in amount and detail of nebulosity and stars when stacking 23 30s exposures compared to 3 240s exposures apart from the 30s stack had less noise and less saturated stars. This suggests that 30s exposures could be used.<\/p>\n","protected":false},"excerpt":{"rendered":"

2016-07-28 23:30-01:00 Clear, no moon, no wind, 12 degrees C 2016-08-02 00:00-02:00 Low clouds, no moon, no wind, 10 degrees C 2016-10-03 21:00-03:30 Some initial high clouds, some wind, 85% humidity, 5 degrees C Took some more test luminance frames on 2016-07-28, 2016-08-02 and 2016-10-03 … Continue readingASI1600MM-COOL test<\/span><\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":1042,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[26],"tags":[],"class_list":["post-1043","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog-2"],"yoast_head":"\nASI1600MM-COOL test - astrophotos.se<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/astrophotos.se\/?p=1043\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"ASI1600MM-COOL test - 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