I went out the other day as a spur of the moment thing to take some long exposure photos down by a beach that isn't exactly local, but not too far away either. I grabbed my camera bag and headed down without giving too much thought to what would happen. It turns out, the place is the most popular place ever, it took half an hour to find somewhere to park the car.
Anyway, I'd started taking some long exposures and to my horror noticed the spots on the image from dust on the sensor presumably. I usually don't shoot with my aperture stopped down this much and hadn't really noticed it till now. Reluctantly I used it as an excuse to cut my trip short.
I'm sure you will see what I mean if you look at this image. I wrote a bit more about it here:
https://timnwells.medium.com/clean-your-sensor-575fff9b3249
