Originally posted by Vylen as a poor uni student, i put filters on anything i can.... id just rather not risk it given my limited budget...
Here's the ultimate in cheap protection: collect busted/scratched/screwed filters and take the glass out of them, and put the metal rings on the end of your lenses. It'll "protect" from an accident the same way a regular filter will, it just doesn't protect from dust.
To be honest, I use most of my lenses naked, including my Takumar lenses. There are few filters out there of sufficient grade as to not degrade the image transferred to the lens, and I'm not prepared to pay for the ones that do exist. I use my lens cap *religiously* when I'm out shooting, for two reasons: conservation of battery, and protection of the lens. The lens cap is supposed to protect the lens, that's why lenses have always come with them. Convincing the general populace that they "must" have a filter to protect their lenses was merely a retail trick to increase add-on sales, and it's continued to work well to this day because the majority of people putting the cash up to buy this equipment are scared of losing it.
I haven't done the no-glass filter trick yet, but I might consider it.