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It is hard to get a really dark background in video with a TG7; a strobe is much stronger than a video light and that makes it easier for stills.
A TG would be a step down from an S series Canon, probably several steps down. Smaller sensor, much less dynamic range, no manual control. But the TG series has one thing, macro capability. How you can get a black background in a camera without f stops and shutter control, beats me but some seem to do it okay. But with such a limited budget, that may be the most practical solution for fun macro pics. And one or two Inon S220 strobes or the Backscatter MF-2 strobes (which have RC control).
Thanks to cell phones the compact camera market has died. I think the Canon G7 is still available and it has a one inch sensor. Really, to get a step up from a S series canon you will need to move to a M4:3 or APS-C platform. An interchangeable lens camera system that can mount a macro lens or a housing that can accept a water contact diopter system. And that will run more than 2000 Euro.
This from my TG6 in Super Macro it's not black but is dark. I do have video of black frogfish which are hard to get right.
Thanks for your reply. If I would change my price limit, what kind of m4:3 or APS-C platform would you recommend? Including housing etc
Or by Reef Photo and Video, especially for Nauticam things.If you buy used, make sure that you have them inspected and serviced by Backscatter first.
Do you do any post-processing on your videos, or are these videos straight out of the camera without post?
Or by Reef Photo and Video, especially for Nauticam things.