kipper wrote:Dave, I've got 5 filters at the moment as screwin types 67MM
Actually, think yourself lucky. My lenses are either 72mm or 77mm (and one little 52mm thread on my 50/1.8 that I use once in a blue moon).
kipper wrote:UV
Each of my lenses has one of these. It might not always be there, but when it is it's mainly for salt/sand/water/bump protection, and a screw-in is the only option.
kipper wrote:CPL
Currently I have a 72mm and a 77mm, although on a recent trip I was toying with the possibility of getting another 77mm (in many cases I have two cameras/lenses on me, and swapping the polariser is not optimal).
kipper wrote:ND4
Don't have one of these. I suspect if I did it would get about as much use as the 50mm. Generally if I need some ND I cheat and use up a few stops with a polariser.
kipper wrote:Closeup +2
Closeup +4
These are definitely screw-in. I can't imagine these suiting a cokin-style arrangement.
kipper wrote:I'm now at a point where I think the next time I buy some filters it will be using the cokin system. It looks a lot more versatile then the screwin type.
Whatever rocks your boat.
The Cokin-style filters can work well for landscape work, but aren't the most practical for handheld work or crawling through the bush...
At least they do have the advantage of suiting a variety of filter threads (only needing the appropriate mounting ring for each thread to match the holder).
Incidentally I use a Domke filter pouch (with "Kata" inserts for various sizes) which usually lives on the belt of my hip bag (or clips off to go in a vest pocket, etc). As long as you don't have TOO many, carrying round filters and keeping them safe from dust and damage isn't hard (I'm currently only carrying a couple of polarisers). Personally if I was in the market for a G/B PL I would be looking at a 77mm screw-in. If I was considering split ND grads I would be looking at getting more of a Cokin system, but I'm happy with the flexibility of digital blending.
Carrying the Cokin holder and each of the filters safely is also do-able, but it is going to be a bigger proposition.