This week I was happy to have a myth dispelled! In another thread, I mentioned as an aside that I would be 'keeping a lens around for B&W'. Several of the replies mentioned that a good lens for B&W would also be a good lens for color and that in general, if it sucks for one, it won't work well for the other either. Great! It's another inaccuracy down the drain.
What other commonly held notions shouldn't be held regarding lenses, or even LF in general? Expense? Camera rigidity? Hand holding for shooting? What else?