I owned a 23C and loved it. The model name, 23, is a clue to it's max. format. Just like 45 on the larger models. The 23 was built to handle 2 1/4 x 3 1/4, a.k.a. 6cm x 9cm. Omega enlargers built for 4x5 will work too as pointed out with the right lens, neg. carrier & condenser if you are very picky. 45 minutes is a no brainer to pick up good darkroom hardware. I made a trip like that for a complete 35mm & 6x6 darkroom. 500 miles for a complete 35mm & 4x5 darkroom. The lenses alone are worth more than the fuel to get them.