Question: Stereo microscope focal length

[Bakelite]

Hello from Canada, first post here. I recently bought an older Bausch and Lomb stereo microscope with a moveable base for a price that was too good to refuse. It came with 10x eye pieces and currently the space between the scope and an object in focus is about 3 inches - I’m assuming that’s called the focal length. My question is if I replace the 10x eye pieces for 5x would I increase the focal length? Because I have not engraved anything with a scope I’m not sure what the proper working distance should be. Thanks in advance!

 

[monk]

replacing witxh 5x wont alter the fl. you need to get a .5 or a .3 objective on the bay. then, you may want more power, just go with 12, or 15x eyepieces.
i got a .5 for my leica. it was off by a milimeter in dia. i simply affixed the objective to the scope with hot melt glue.
the .5 will double the fl. the ,3, a bit more