Comparison Canon 75-300mm f/4.0-5.6 EF USM III vs Canon 75-300mm f/4.0-5.6 EF III

Clear Table
Add to comparison
	Canon 75-300mm f/4.0-5.6 EF USM III	Canon 75-300mm f/4.0-5.6 EF III
	$159.00 Compare prices 1	from $128.00 up to $225.24 Compare prices 19
all specs only differences
TOP sellers	Amazon.com $159.00 Buy in shop	Newegg.com $176.00 Buy in shop Buydig.com $199.00 Buy in shop Target $159.00 Buy in shop
Lens type	telephoto lens	telephoto lens
System	Canon	Canon
Mount	Canon EF	Canon EF
Specs
Focal length	75 - 300 mm	75 - 300 mm
Aperture value	f/4.0 - f/5.6	f/4.0 - f/5.6
Viewing angles	27° - 6°50', 18°11' - 4°35', 32°11' - 8°15' /horizontally, vertically, diagonally/	27° - 6°50', 18°11' - 4°35', 32°11' - 8°15' /horizontally, vertically, diagonally/
Min. diaphragm	32 /32 - 45/	32 /32 - 45/
Minimum focus distance	1.5 m	1.5 m
Maximum zoom	0.25 /at a distance of 300 mm/	0.25 /at a distance of 300 mm/
Design
Sensor size	full frame/APS-C	full frame/APS-C
Autofocus drive	ultrasonic drive motor	motor
Design (elements/groups)	13 elements in 9 groups	13 elements in 9 groups
Number of diaphragm blades	7	7
Filter diameter	58 mm	58 mm
Dimensions (diameter/length)	71x122 mm	71x122 mm
Weight	480 g	480 g
Added to E-Catalog	november 2006	november 2006

Autofocus drive

A type of drive that ensures the movement of lens structural elements during automatic focus. Currently, the following types can be used:

— Ultrasonic motor. The most advanced type of drive to date. Ultrasonic motors are much faster than conventional motors, provide higher accuracy, consume less power and are virtually silent. However, their cost is quite high.

— Stepper motor. Drive control focal length and zoom (zoom). This type of motor is used for the most part only in full-size digital cameras. Among the advantages of a stepper motor, one can note: high reliability and accuracy of operation; in addition, it does not require power supply to maintain focus and zoom. Of course, stepper motors are not without drawbacks. Among the minuses can be identified: slow speed and increased noise. Additionally, a stepper motor is characterized by large dimensions and a rather large weight, which physically does not allow this type of drive to be integrated into the optics of mobile phones and ultra-compact cameras.

— Motor. In this case, an electric motor of a traditional design is meant. Such drives are simple and, as a result, inexpensive. Their disadvantages are the relatively low speed of operation, as well as the noise produced during this; the latter can sometimes be critical — for example, when shooting wildlife. Recently, designers have been us...ing various tricks to neutralize these shortcomings, but in general, the characteristics of conventional motors still remain relatively modest.

— Is absent. The complete absence of an autofocus motor in the lens. Focus such optics can be carried out either by the “screwdriver” system, or strictly manually (for more details on both options, see below).