Omega had manufactured 10x10 enlargers for the military since WWII. It took some time, but the 8x10 Omega F was finally offered to photographic and graphic arts professionals in 1965.

Customers had the choice of a triple condenser or Chromega lamphouse. Standard features included a rotating glass negative carrier, built-in masking control, heavy duty castered floor stand with quad aluminum girders, extra long bellows, and 3 position 24"x32" baseboard. The high output Xenomega light source was an option for graphic arts applications.

The F was primarily intended for 8x10, 5x7 and 4x5 formats. For smaller negatives, an accessory Small Format Attachment was mounted in place of the usual lens mount.  Similar in appearance to the auxiliary focusing attachment, it had a slot to accept its own series of small format negative carriers. 

The Chromega F lamphouse covered 8x10 and was therefore not suitable for the large aerial roll film format. There were no accessory mixing spheres for smaller formats. When the Dichroic lamphouse and Chromega F Dichroic chassis were introduced, an adapter kit allowed retrofitting the dichroic lamphouse to the older style chassis. 

Used Advice:  The chassis is fully serviceable but lamps and parts for the older lamphouses are rare. The enlarger is large and heavy, so be prepared for significant shipping costs.  Missing accessories can be pricey, so check that the unit is complete.