Modulation Transfer Function or "MTF" is a measurement of the optical performance potential of a lens.

Image Stabilizer Settings - You can use the image stabilizer in AF and MF mode

• Set the STABILIZER switch to ON - If you are not going to use the image stabilizer function, set the switch to OFF.
• Select the stabilizer mode - MODE 1 : Corrects vibrations in all directions. It is mainly effective for shooting still subjects . MODE 2 : It compensates for vertical camera shake during following shots in a horizontal direction and compensates for horizontal camera shake during following shots in a vertical direction.
• When you press the shutter button halfway, the image stabilizer will start operating - Make sure the image in the viewfinder is stable, then press the shutter button the rest of the way down to take the picture

Sample Image

What's in the Box?

• Canon EF 300mm f/4L IS USM Lens
• E-77U 77mm Snap-On Lens Cap
• Lens Dust Cap E (Rear)
• LZ1128 Lens Case
• Tripod Mount Ring           
• Strap for Case
• Built-In Lens Hood

Setting the Lens

• Mounting and Detaching the Lens
• Setting the Focus Mode - To shoot in autofocus (AF) mode , set the focus mode switch to AF. To use only manual focusing (MF), set the focus mode switch to MF, and focus by turning the focusing ring. The focusing ring always works , regardless of the focus mode

• Switching the Focusing Distance Range - You can set the focusing distance range to 1.5m/4.9 ft to infinity or 3 m/9.8 ft to infinity. By setting the suitable focusing distance range, the actual autofocusing time can be shorter
• Infinity Compensation Mark - To compensate for shifting of the infinity focus point that results from changes in temperature. The infinity position at normal temperature is the point at which the vertical line of the L mark is aligned with the distance indicator on the distance scale

Tips on Using the Image Stabilizer - The image stabilizer in this lens is effective for hand-held shots under the following conditions

• In Semi-darkened areas such as indoors or outdoors at night
• In locations where flash photography is prohibited such as art museums and theater stages
• In situations where your footing is uncertain
• In situations where fast shutter settings cannot be used
• When panning subjects in motion

Using the Tripod Mount

• Loosen the orientation locking knob
• Rotate the tripod mount and align the mounting indicator on the tripod mount with the one on the lens
• Slide off the tripod collar away from the rear of the lens

Hood - the built-in lens hood can reduce unwanted reflections and also protects the front of the lens from rain, snow ,dust and other substances. When using the hood, extend it outward from the end of the lens until it stops and then turn it in the direction of the arrow. For storage, reverse the procedure

Specifications:

• Focal Length & Maximum Aperture...............300mm 1:4.0
• Lens Construction............................15 elements in 11 groups
• Diagonal Angle of View ...................8° 15'
• Focus Adjustment.........................Rear focusing system with USM
• Closest Focusing Distance................1.5m / 4.9 ft.
• Filter Size...............................................77mm
• Max. Diameter x Length, Weight.................3.5" x 8.7", 2.6 lbs. / 90.0 x 221.0mm, 1190g