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Type: - Autofocus lens type with manual focusing mechanism
Focal Length: Fixed focal length 200mm
Focus Adjustment:- Autofocus with USM with Inner and rear focus with Focus Preset control via Focusing range Selector
Manual Focusing:- possible via AF/M switch and electronic full-time manual focusing possible via focusing ring
Zoom Adjustment:- Nil. Fixed Focal Length Lens
Closest Focusing Distance:- 2.5m (8.2 ft)
Maximum Magnification:- 0.09X
Drive System:- Ring-type USM equipped with full-time manual focusing
Distance Scales: Provided via window on metres/feet.
Angle of View:- 10° 7° 12° (horizontal, vertical and diagonal)
Aperture range:- f/2.8 - f/22
Number of Diaphragm Blades: - 8 blades
Minimum Aperture: - f/22
Filter rotation: No
Filter Attachment Size:- REAR Drop in type 48mm;
Lens construction:- 12 Elements in 10 Groups with three UD glass elements (at 2, 3 and 5 - protective glass as first element)

Optical contruction Illus MTF performance for EF200mm f1.8L

Extenders: Usable. Extender EF 1.4X:- focal length multiplication: 280mm f/2.5, AF retained, Magnification ratio: max. 0.12X; Extender EF 2.0X: focal length multiplication: 400mm f/3.5, AF retained; Magnification ratio: max. 0.18X;
Others: - Extension Tube EF12 (II) 0.15X~0.06X; Extension Tube EF25 (II) 0.23X~0.24X; Tripod collar built-in
Diameter:- 208mm x 130mm ( 8-3/16" x 5-1/8") Weight:- 3,000g / 6.6 lbs