Canon - Canon Lenses

EF 300mm f/4 L IS USM

*LEns Specification*
Lens	EF 300mm f/4 L IS USM
Focus Drive	USM
Angle of View
Construction (groups-elements)	11/15
Minimum Aperture	32
Closest Focusing Distance	Feet	Meters
		1.5
Filter Size (mm)	77
Hood	Built-in
Length	Inch	Millimeters
		221
Weight	Ounce	Grams
		1,190

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Personal Opinion

This lens feels like the high-quality lens it is supposed to be.
A built-in push-pull lens hood extends to provide good masking of stray light from the sides. When retracted, the hood grabs on to the Manual Focusing ring of the lens and together, they become one giant focusing ring. Since the Manual Focusing ring by itself is already huge (5cm wide), the addition of the hood as focusing ring means that I could realistically grab onto any part of the lens end and be able to adjust focus. Very convenient, though I use the hood almost all the time.

When extended, the hood clicks into position to prevent sliding. This means I could place the lens down with the hood extended with a (heavy) EOS1n, and the hood stays in position. While I don't know how long this groove holding the extended hood in place can withstand my constant extending and retracting, it has been holding up very well.

When used handheld, IS modes 1 and 2 really meant no noticeable difference to me, though each is supposed to work in slightly different ways. You can take handheld pictures in both modes confidently, though the recommended mode is 1. Mode 2 is recommended for tripod use.

Feel free to give me feedback or new links.

All pictures scanned from Canon brochures, in which the original image is actually about 10 times smaller than the image that you see above.
Hence, the resolution of the above image is limited by the original size of the brochure image. The image above is life-size.