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I shoot B&W with older Canon and Panasonic. I think it's called the picture styles menu on the Canon body, I set it on monochrome.
I use DPP, with the Canon, if shooting RAW, which sees the in-camera settings. (I doubt PS does) Or, you can shoot it in color, and convert it to monochrome in the software, if you shoot RAW. I think it is better to shoot it how you want it, though.
The Panasonic software I have used so far doesn't really see the in-camera settings, which can be annoying.
Of course, you can shoot jpeg on B&W with pretty much any camera, I'd think. Be sure to shoot RAW+jpeg to test your cameras jpeg and RAW quality, before you do this, though. Which isn't a bad idea, anyway.
I shot some jpegs using my older Panasonic body, but I have been able to beat them with the RAW every time I've tried, so I try not to do that as much.
Are you trying to use different software than ps, or avoid pp altogether?