One camera with several lenses? A particular lens used on several cameras? Or one lens per camera? If I think about the cameras I have that can swap lenses, I have more lenses than cameras. On the other hand, I still have a lot of cameras.
There is a definite argument for one lens per camera when you are shooting action or the conditions are bad. For some sports or action you don’t have the time to be swapping lenses, plus there is the risk of damage or dirt to the lens you are not using. And in wet or dusty conditions I don’t want to be swapping lenses anyway. I remember taking pictures on a very windswept beach where the air was basically opaque from ground to knee level. Not a place to put your camera bag down.

There is a risk that you end up looking like the Dennis Hopper/ Tim Page character from Apocalypse Now, dangling with cameras like a sale at Jessops. But if I was doing something where it was necessary, I’d probably do the same. Probably not as many drugs though.
But at the end of it all, a camera is just the thing that drives the lens. Except I suppose when the camera has a special quality of its own, like a certain type or size of film or sensor, and doing something clever like panoramic framing.
It’s an idea I started playing with previously, when I started wondering about the functional value of all my kit. So I really ought to think about the lenses too. Do I really need two 135mm lenses for example, or a boxfull of fifties? Maybe yes to the fifties, as they each have a distinctive character. Most of my lenses work on most of my cameras, so perhaps I need to make another grid to work out what I really need and what could be swapped for something more useful?

So, the meaning of the grid: N means the lens is native to that camera. A tick means it also fits this camera. The number in brackets is how many of that lens I own. (I know, I’m ashamed myself). I have given the lens’s actual focal length and ignored the angle of view.
You will see from the grid that I acquired lenses like they were cheap and about to go up in price. Guess what… I didn’t know about increasing in price but I do like a bargain. In general I bought the fixed focal length lenses because I wanted what they could do, the long lenses to cover sports and the zooms because they turned up at the right price. Maybe that’s not fair – there are three zooms that really matter. The 16-45 is brilliant on the APS-C digital camera. The 24-50 is equally great on the full frame camera. And one of the 70-210 is a Vivitar Series 1. This is the lens that a pal of mine at university used to fell a problematic person who was blocking his view. Any lens that can be set to stun and then keep rolling is a bit of a legend to me. I’ll admit – I also have lenses that turned up as a body cap on a camera I wanted, were too cheap to pass up or were part of a bizarre experiment.
I think I have definitely strayed into the many-to-one area in my lens to camera relationship. So what’s a poor boy to do?
I definitely have too many lenses. A few years ago I went to photograph some motorsports and, as I hadn’t done it for a while, took all my long lenses. That was one heavy bag. I can also feel a cull of zooms coming on. Some of them, like the 80-205, are worth peanuts but they are taking up space and someone else might get some use out of them. Same with one of the 70-210s and maybe a few more. So I suppose at the moment I am definitely in the region of (very) many-t0-one and I feel I need to get to the smallest set that fits the cameras I need them to.
Watch out eBay – here I come!