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Thanks, Needa. I tried a new exposure instance and a tonemapping. The outcome looks better but the improvement still unsatisfactory. Guess like you said it's gone for now... until next experiment.

Hi, I spent 3 hours in the mid of a chilly night and then mistakenly set iso=800 and 30min to shot a startrails image (extremely over-exposed, see pic1). Then I used darktable to reduce the exposure to make it visible (as in pic2). I just wonder if I can continue with darktable to bring the...

Needa, I tried the parametric mask by changing output/input. It seemed nothing happened... So I just changed the exposure and black level. It seemed working and bringing up more stars: Before: after: And the high iso: before: after (quite more editing):

@Nick, It's ok as long as I find the way (use MF) to shoot night-sky effectively (still learning to master MF with viewfinder especially in night time). BTW, I can still and will use BBF for most other shootings as I find it a great technique to use. So thank you for tipping and teaching me...

Ok, after several experiments and tests, I have come to the conclusion on focus for (at lease) my case. It turns out Nick is right about whether D3500 provides full BBF function. It doesn't -- whenever there is nothing or nearly nothing (e.g., empty wall, empty sky even with high cloud or dark...

@Andy, So in the sports shot, you would be the one to set up exposures (iso, aperture, speed). Now for shooting moving subjects knowing shutter needs fast, yet there will be various moving speeds of different targets. Is there a rule or formula to determine how fast the shutter speed should be...

Newbie's before and after:

@nickt, I tried using the B button on my D3500 and it worked with using shutter button to take a picture. But not sure if I have to keep pressing the B button (to maintain focusing) when pressing the shutter?

Say I use MF or AF to focus a subject and I want to lock focus ring to that distance. Is there a simple way to lock focus from that point? (AE-L/AF-L is way too much for me to use, especially the button need to be pressed all the time. I need free fingers all the time after focus locked:) I...

Newbie's moon shot -- nearly full moon:

Processed nearly full moon photo (after the iso200 one):

Thanks to Andy's full moon reminder, I tried dozen of moon shots tonight (nearly full moon though). Only a couple looked fine and acceptable. I post two of them which are jpg unprocessed or enlarged, cropped (only scaled for attachment):

@mike, Thanks. @Andy, Great info about full moon coming! Thanks @Marilynne, Maybe "Newbie's Moon Shot questions and helps", though I still have other newbie's questions on other topics (I am starting a new discussion on D3500 battery). @Dan, Thanks for sharing your experience and helpful tips. I...