The Computar dL 90mm F4.5 enlarger or enlarging lens is pictured below.
 

Computar dL brochure
 
The Burleigh Brooks Optics Inc. brochure for the Computar dL line of enlarger or enlarging lenses is partially reproduced below.

	Burleigh Brooks Optics Inc. Computar brochure published 1977[1]

Sample images

These sample images below were taken with a Canon 5D2 and a Nikon PB-4 bellows unless stated otherwise. RAW files were converted in C1 with minor sharpening to compensate for the Canon 5D2 Anti Aliasing filter. The resized images have had minor sharpening to compensate for resizing.

	Photographed with Computar dL 4.5/90 at F4.5
	100% crop of the above image.
	Photographed with Computar dL 4.5/90 at F5.6
	100% crop of the above image showing rendition of OOF areas in front and behind the plane of focus.
	Photographed with Computar dL 4.5/90 at F4.5 with tilt (on Nikon PB-4 shift/swing bellows) to alter the plane of focus to match the front surface of the lens. Some longitudinal CA is still visible at this F stop.
	Photographed with Computar dL 4.5/90 at F8 with tilt (on Nikon PB-4 shift/swing bellows) to alter the plane of focus to match the front surface of the lens. Some longitudinal CA is still visible at this F stop.
	100% crop of image photographed with Computar dL 4.5/90 at F4.5 with tilt. Although sharpness is excellent there is significant longitudinal CA.
	100% crop of image photographed with Computar dL 4.5/90 at F8 with tilt. Although sharpness is excellent there is significant longitudinal CA.