help with lenses

[duello]

I'm using a Pentax K1000, and I want to buy a zoom lens for it. My camera takes a 50mm diameter lens, but most of the used lenses I’m seeing listed online are either larger or smaller than this. Now I’ve read that all pentax k mount lenses and k-mount cameras are compatible, but does this apply to the size variation as well?

 

[Sideburns]

there's no difference in diameter. How'd you even find out the diameter anyways?

Just use the k-mount lenses and you'll be fine.

 

[Big Mike]

Welcome to the forum

I'm guessing that the 50mm you are seeing on your lens...is the filter thread diameter (or possibly the focal length) not the mount. As mentioned, it's a K mount, so any lens with a K mount will work.