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Danny
hello every one,
I have an EOS R3 mirrorless camera, with the 15-35 RF 2.8 and 28-70 RF 2.0, I take pictures of the night sky, it is a low light environment so I set the parameter accordingly, (F2.8, 15 sec, iso6400), when I acquired the camera the recommendation of canon was not to use the profile of the lens, I did make the change and it corrected in 50%.. I replied with that information but I didn't receive more data. couple weeks ago I went to Goblin Valley UT to picture the Milky Way there this is one of the 21 frames I took for a panoramic stich...
Hm, up left PureRAW with lens correction. Up right PureRAW without lens correction.
Below left darktable without lens correction.
In your first picture you got both top corners green. I get just right one in the raw file you uploaded.
Could you please upload the raw file from your first picture here also? I am asking because you have the Milky way at a different place and more to the right corner there. Also the green corners in that picture look like something from a vignetting correction.
This one you uploaded on the other hand doesn't look like something from a vignetting correction.
Have you tried Long Exposure Noise Reduction turned on? What about same settings with lens cap on?
Left corner, no problem. Right corner looks greenish. Try LENR vs no LENR with same settings and also try to take some dark frames with lens cap on and without LENR. Report back.
Same with your 28-70 RF 2.0?
For your two first pictures without lens cap I meant real night pictures of the sky, so try with and without LENR next time you get out there. A bonus is that LENR will clear out those 400 bad pixels but double the exposure time.
It seems you catched a muon in you xxxx63 file.
I increased the brightness by 7,5 EV to make it stand out, but it is visible at 4 EV. Take a look at the thumbnails. LENR (or a dark frame you later use) solves it.
A dark frame should be taken at the same time and temperature, but if I were you I would try to use your XXX65 dark frame together with your astro pictures with 15 seconds exposure and ISO 6400.
Enough said about dark frames and LENR. I have seen a sensor factory calibration with a 550D to reduce fixed pattern noise. I don't know if it is possible to do something similar to R3. You should call Canon and ask. If you find any other R3 owners you can ask if their R3 sensors behave the same.
There is a review about R6 and "amp glow" here, but the exposure time was way longer and that looks like what I have been seeing before with older Canon models at very long shutter speeds https://amazingsky.net/2021/09/23/testing-the-canon-r6-for-astrophotography/
