Focal Reducers

[Rustmonkey]

I have a Focal reducer for my Ed100 DS pro which fits my Canon 50D but being new to this I'm not actually sure what it does.

Could someone please explain and also tell me what difference to my images it would make by removing it?

Am I right in thinking that removing it will make my subjects slightly bigger on the final image but that my exposures would need to be longer to get the same detail?

[Uranium235]

Am I right in thinking that removing it will make my subjects slightly bigger on the final image but that my exposures would need to be longer to get the same detail?

Yep, thats about it. Apart from field curavture - which will then begin to show up if you have a large chip in your camera (assuming your FR is the matched 0.85 reducer). Best advice is to leave it alone, faster is always better when it comes to imaging.