I have a D3100 with: Nikon DX 18-55 lens Nikon DX 55-300 lens Nikon DX 35mm prime lens It's a bit of a sweeping statement but nearly all of the pictures I'm really pleased with have been taken with the 35mm prime. I understand a prime lens has less compromises than a zoom. A few years ago I posted here asking for advice on how to travel light on a holiday. As a result of that I bought a Sony HX400V super zoom. Many pictures from that holiday were disappointing and following a lock-down clear-out I was going to sell the Sony. But many people post fantastic pictures online taken with exactly that camera so I resolved to use it in only manual or AP or SP for a while and really learn how to use it properly. Now I've taken a number of pictures I'm really pleased with which, given the broad range of the inbuilt lens, I would have missed with the Nikon. BUT, nothing, (I've got), beats the Nikon plus 35mm prime for absolute quality. I suppose that's obvious. Now I like the Sony more I've a dilemma - which camera to mostly carry? Further, I've been given a present of a photography experience at a bird of prey centre. I'm thinking of taking the Nikon plus 35mm prime only for close and 'bokeh' bird portraits and the Sony for everything else. The Sony will always be better at doing everything at once. The Nikon plus 35mm will always be better at one thing. Somewhere In between the two I wonder if, now I'm a better photographer, something like the D3100 and (f4.5) 55-300 has a use anymore or should I sell it? It doesn't help to be using two different camera brands and having to remember each of their operating vagaries. So, ( ! ) I was thinking about how some practical tests could be performed to aid the decision process. An obvious series is to hand held and tripod mount pictures of the same item at various distances. Using the Sony on its own and then the Nikon with its various lenses. Anybody else got a better idea? Thank you!