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General| Focal Length | 400mm |
|---|---|
| Diagonal Angle of View | 6°10' |
| Lens Mount | Canon EF |
| Closest Focusing Distance | 3.5m |
| Format Compatibility | 35mm full-frame |
Multi-layer DO element corrects aberrations for high image quality and compactness.
Provides a two-stop faster shutter speed effect with two operating modes.
Features USM for quick AF and full-time manual focus capability.
Dust/drip-resistant seal and lightweight magnesium alloy build.
Explains warning symbols for safety and supplementary notes for usage.
Warnings against sun exposure, and injury from lens cases.
Guidelines for preventing condensation and heat damage to the lens.
Potential halo effect from DO elements and FCC compliance.
Identifies focusing and image stabilization controls, AF stop button.
Details lens mount, tripod mount, and electrical contacts.
Locates hood mount, strap mount, drop-in filter slot, and distance scale.
Instructions for protecting lens surfaces and contacts after removal.
Guidance on cleaning contacts and attaching the dust cap.
Step-by-step instructions for threading and securing the camera strap.
Instructions for selecting between Autofocus (AF) and Manual Focus (MF).
Options to set range to 3.5m-infinity or 8m-infinity for faster AF.
Enables manual focus adjustment even in AF mode after initial focus.
Explains potential focus stopping and how to correct it.
Allows pausing autofocus by pressing the AF stop button during operation.
Mark on distance scale to compensate for infinity focus shifts due to temperature.
Explains how autofocus resumes after button release or camera model specifics.
Tip for precise manual focusing at infinity using the viewfinder.
Instructions for turning the Image Stabilizer ON or OFF.
Details MODE 1 (all directions) and MODE 2 (panning) compensation.
How to start IS and ensure the viewfinder image is stable.
Conditions where IS is effective: low light, flash-prohibited areas, uncertain footing.
Situations where IS may not be effective: subject movement, bumpy roads, dramatic panning.
Notes increased power use and risk of malfunction if lens is removed during IS operation.
Lists compatible cameras/extenders and notes custom function reassignment.
Explains the ET-120 hood prevents stray light and protects the lens front.
Procedure for loosening the knob, fitting the hood, and tightening.
Allows rotation of the tripod mount for vertical/horizontal camera positions.
Steps for removing and reattaching the tripod mount collar.
Details the lens's holder for gelatin filters and its installation.
Procedure for trimming and mounting a gelatin filter in the holder.
Table showing changes in focal length, aperture, and angle of view with extenders.
Notes on attaching extenders, manual focus limitations, and AF speed.
Details shooting distance and magnification with EF12 II and EF25 II tubes.
Recommendation for using manual focus for accurate results with extension tubes.
Step-by-step instructions for securely packing the lens in its case.
Summarizes key technical data including focal length, aperture, weight, and dimensions.
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