camera and lens , My own observation
i didn't really realise, until I had my bad fall making one hand not so strong as the other, the importance of having the right balance between camera and lens.
By this I mean and found out that if a heavy lens is on a relatively light camera how much effort goes into supporting one against the other
The tendency is for the heavy lens to want the camera to keep pointing downwards and find always fighting to prevent it. This makes taking photos very tiring hand held.
I found it has made little diffence with a light lens attached so no real problem there.
Personally i prefer working with a heavy camera and lens equally balanced as I can hold them steadier. Yes there is image stablisation as well but this doesn't help if holding a heavy lens up for a period of time.
Just a couple of thought of mine