Nikon EL-Nikkor N 63/2.8

Second generation orthometar enlarger lens. Image circle: 55.2mm.

Weight	101 g
Dimensions	63 mm
Focal Length (mm)	63
Max Aperture (f)	2.8
Min Aperture (f)	16
Aperture Blades	8 (Straight)
Elements	6 / 4
Sharp (Far)	88.8%
Rear Mount	M39
Front Thread	40.5mm
Flange-Focal Distance (mm @ ∞)	55
RF/L Extension (mm)	34.5
Serial Numbers	801143-801453
Bokeh Character	Excellent at f5.6. Slight soap bubble.
Contrast	High
Colour	8.2
Focus Shift	Mild
Flare	5
Stars	7