ThrillaMozilla
Veteran Member
This really tells you everything you need to know, if you understand it clearly and apply it correctly. It doesn't tell you what equipment you need, but it does define the optical limitations of the cameras.To get an equivalent picture between two formats is simple. Take the crop ratio. Set the f-numbers according to the crop ratio, that is, if you use f/8 on FF, use f/4 on mFT. Set the ISO according to the square of the crop ratio, or thereabouts. So, if you use 400 ISO on FF, use 100 on mFT. Set the shutter the same. That photos like that, you will find it very difficult to tell the difference. What this also tells you is that there are photos that you can take on FF which you can't take on mFT. If you were using f/1.4 or 100 ISO on FF, you'd need to use f/0.7 or 25 ISO on mFT....
This being the internet, there is some wisdom in the other posts, but there is also a lot of confusion and obfuscation. Some of the posts are just plain wrong.
That being said, you do seem uncertain about your needs, and the uses you named do seem to require different kinds of cameras. The truth is, some serious (even professional) photographers use MFT because it's small and light, especially for long focal lengths. Most professionals probably use FF because it's quite versatile, but it's also big, heavy, and conspicuous. For some the best compromise is APS-C.