1) Buy for cash the camera now. You don't have any cash in hand afterwards, and the camera is depreciating in value immediately as an asset only offset by whatever you do with it.
2) Buy via BNPL with no interest for 12 months, and pay exactly a 12th a month. You have the camera, but you also have 91% of your cash in the bank that /does/ get interest or can be used for anything else like investing in shares. You still have liquidity and can assumedly use the camera to generate some cash doing weddings or whatever as part of your hobby for one year.
3) Save cash where you are getting similar rates of interest as 2 for 12 months once you've identified you need something. Buy the camera a year after you needed it, you have lost the opportunity of 12 months revenue from maybe one wedding a month? The price is either affected by inflation after a year, or more hopefully its gone down due to competition with other models, but who knows. Also do you still need a camera? you've certainly lost out on a years experience to know if it was worth it.
BNPL makes plenty of sense if you can or cant afford something, more so if you can.