David,
When 'transmission'.electron micrographs it is almost essential that you make the prints using a POINT SOURCE enlarger (as opposed to the negatives exposed using a 'scanning electron microscope)to ensure that the fine detail from the extremely thin sections can be 'resolved' on the print made from the EXTREMELY thin sections. I spent many days making B/W enlargements from negatives for the electron microscopist when I was employed at the nearby Agriculture Canada Research Center.
The Point-light source light in a 5x7 Durst 138S was also used for making the occsional B/W negatives from microtomed sections of the 'slide-mounted' fixed and stained soft tissue.... usually far superior to what can be recorded when using a camera mounted on even the 'highest' quality bench-top microscope.
Ken
OOps!!! I forgot to mention that when point source light is used, the lens is always used wide open rather then using the f-stop for 'brightness"... which is done by regulating the voltage using a rheostat, thus you have to make sure the image is properly 'in focus' at the time of exposure
This you have LITTLE to NO Depth of field 'freeway' when it comes to focussing the image.
Ken