Filter - before or after lens adapter?

[daleremote]

Let's say I've got a wide angle (or tele) converter lens on my camera.

Does it make any difference if
1) I put a UV filter between the camera's regular lens and the converter lens
-or-
2) I put a UV filter on (in front of) the converter lens itself.

Is the key to keep UV rays from hitting the film/sensor? (In which case there is no difference between 1 and 2.)
Or, is the key to keep UV rays from hitting any glass and dispersing within the lens? (In which case #2 is better.)

Same for ND filters or any other kind of filter?

Am I really just splitting hairs here?

Thanks for any pointers,

— Dale

 

[tasman]

I don,t think their is a difference which one goes on first. I always have a UV filter on to protect the front of the lens. Then I would add what ever filter after.

 

[Torus34]

Filters in front.

 

[benhasajeep]

Well if possible filters in front. But some lenses you have to have filters in the rear just due to their construction (wide angles, large telephoto).

I am inclined to say in front just due to the fact that I use a circular polarizer and would not want anything hanging off the front of it with any weight. Just in case it came apart.

Picture quality wise. I really don't know enough about filter specifics and if one keeps light from scattering or what. Also I don't know if it would be that much of a difference as some lens adapters are not that high in glass quality / construction anyway.