If I've learnt anything in life, it's to not trust any fireworks coordinator who has an eye patch and only seven fingers.
A tripod is essential for this kind of shot. Never trust your camera for exposure, this is a situation you can do better in manual (turn the dial to M mode).
The explosions are very bright, so even at night, I'm going to suggest a starting point of f11 and ISO 100. Try an exposure of around two seconds to get nice lengths on the bursts. 'Chimp' (check your shots afterwards on the screen) to assess and tweak for your situation.
Fireworks is one of those situations in photography where autofocus is also useless, so begin by focusing on a distant building or tree at a similar distance to the height of the fireworks, and don't touch it for as long as you're shooting from that position. If only 'Seven Fingers' McGee had learnt to get his timing right while touching and holding things.
You might enjoy - could we say develop a 'flare' for? - this kind of shooting. In your variations, you can try exposures of 20 seconds or more, covering the lens with something like a piece of card when not much is going on, and exposing it during the action. Stick to less than 30 seconds to start with, because after that many Pentax bodies will by default take a similarly long dark frame to compare with your just taken shot and compute what noise reduction might be possible. You can't use the camera while that's happening.
Some interesting effects are possible when not using a tripod but deliberately moving the camera during the exposure, but that's for another time
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K-S2, 21mm, 1.3s, f11, ISO 100
The rest of the series here:
Clackers' Beginners Tips (Collected) - PentaxForums.com
Last edited by clackers; 04-10-2022 at 07:21 PM.