10-18-2018 05:44 AM - edited 10-18-2018 05:45 AM
Personally, I think you are going the wrong direction with the ISO. The higher the number the more noise and grain is going to show in the image. Max ISO 400 will look much cleaner. You should do some test shots with night photo with an ISO of 100 and 200 as well. The lower you go, the cleaner the image will be. The camera will compensate with a longer shutter. If the night laps is going to be done while the night sky stays dark (no sunrise or sunset) set the shutter yourself. Take one test night photo. For the scene in your video, 30 sec shutter should work fine. If there is additional light, like from the moon, 20 or 15 seconds might be better. If you are going to do any color grading in your editor, use Color - Flat and set the sharpness to Low. You can always bring up the sharpness, contrast, and saturation in your editor as you choose, but by having the sharpness low and color flat you will get more dynamic range and a cleaner image. Auto interval is fine.
10-18-2018 05:50 AM
12-05-2018 07:40 AM
i'm sharing a pic of night sky shot with the hero 7B
I've tried night lapse and stills. It's in the south hemisphere, so the milky way is quite cool :). Major constellations can be well identified on photos which is cool.
When not edited, I find the 1600 ISO too noisy, the pics you'll see below are in ISO 800 as I recall.
My next objective is to shoot raw and try to apply different treatment among which noise reduction (for stills).
The good surprise is that the very wide angle of the objective (eq. 16 to 20 mm on a full frame) gives plenty of time for the shutter speed before stars trails beginn to appear. It's almost invisible with a 30 sec shutter speed, although the gopro has I presume quite small photosites compared to a full frame camera.
I would be happy to share best setting options (and post treatment routines) with other night sky photo enthousiasts.
12-06-2018 03:00 AM
and for those who can read French, this page :
helps calculate the theoretical maximum shutter speed the gopro could bear before stars trails appear.
photosite size : 1.54 micrometer [sensor 1/2,3" if I'm right, that is 6,16 x 4,62 mm, compared to 4000 x 3000 pixels)
focal distance : 2 or 3 mm, depending FOV
F number : 2.8
I've checked for a typical France location (45° N, height over horizon 45°), it says between 23 and 32 sec depending on orientation. Which is verified. Not bad at all considered the small 1/2,3" sensor!
(of course, it's the least required due to the quite noisy results the ISO 1600 or 3200 settings will produce ; and it won't compete of course with full frame pics)
12-06-2018 04:30 AM
Another article worth reading is this one written by GoPro engineering tools specialist and night/time lapse photography guru Shreenivasan Manievannan. https://gopro.com/news/mastering-hero7-night-photo-mode
To get more tips and tricks, check out @shreeniclix on Instagram.