The 4550XLG's extra-long box-beam girder of deep-anodized aluminum is as strong, rigid and vibration-free as they get. Allows you to print 20x24" images on the baseboard with all film formats from 35mm to 4 x 5". Fully counterbalanced carriage for effortless magnification control, plus an extended chassis, puts the lens axis just over fourteen inches from the column, making the enlarger easy to use with a large 20 x 24" professional 4-bladed easel on the baseboard. Its light attenuator control (dichroic module only) allows you to instantly reduce light output by two f-stops, without affecting color temperature. Useful when making small prints or working with thin negatives to avoid excessively short exposure times and reciprocity problems.