Most of the professions lens from both Canon and Nikon are endowed with a 77mm filter size. There are of course exceptions, such as long primes and wide angles like Nikon’s 14-24 2.8, but generally speaking, 77mm is the standard.
This fact should not be underestimated. Efficiency in landscape photography, as well as any other endeavor, is enhanced by simplicity and minimalism. This standard filter size not only eliminates the problems of mixing up lens caps, it also facilitates efficiency with respect to filters – one filter fits everything. Again, efficient and even cost effective.
So, what can be done about exceptions, such as Canon’s 70-200 f4 with its’ 67mm filter size. Most photographers know that step-up filters exist but it’s important to go one step further. With the Canon 70-200 for example, add the 67-77 step-up filter but also add a 77mm lens cap. There’s no need to take the step-up filter on and off, leave it on with the 77mm cap. Now you have one lens cap, sized 77mm and all your filters fit all your lenses. Leave the 67mm lens cap at home – if you ever sell the lens, at least the lens cap will be pristine.
Solutions as simple as this really do make photography more enjoyable in the field.