...y removes filtration for focusing and composing requires no external power supply; plugs directly into timer diffusion illumination suppresses dust and scratch marks accepts optional C760 ...

...What typically happens with heavy use and/or lack of proper lubrication is that the rail becomes worn in one area, which results in the focusing becoming loose in that area...If you add tension to the focus mechanism to compensate for the wear, focusing becomes excessively stiff in the other areas...

... When making big enlargements, accurate focusing can be difficult when you cant reach the focus knob while keeping your head near the surface of the easel to check focus...For owners of LPL and Jobo/LPL 4x5 and 7700 enlargers, and Saunders/LPL and Omega/LPL 4x5 and 670XL enlargers, this Flexible Focus Extension can make focusing much easier...

...agnification Control and Focusing Exposure Very Large Magnifications Specifications Maintenance Recommended Focal Lengths of Enlarging Lenses      ...