The optics of the EF 90-300mm f/4.5-5.6 are based on those of the EF 75-300mm f/4-5.6 III and the optical performance is similar. However, the AF drive pattern has been optimized for the EOS 300V, giving a faster AF speed. Also, a new AF algorithm has been developed. All the lens elements are manufactured from environmentally-friendly lead-free glass. A redesigned electromagnetic diaphragm (EMD) provides an aperture which is nearly circular at the widest settings. This gives an improved out-of-focus background effect. Filter Size: 58mm.
Compact size and low weight telephoto zoom lens
One of the lenses with the fastest AF speed in its class
Circular aperture at wide settings
Exterior design matches the style of other EOS models
Only environmentally-friendly lead-free glass used
Specifications:
Angle of view (horzntl, vertl, diagnl): 22°40' - 6°50', 15°10' - 4°35', 27°- 8°15'
Lens construction (elements/groups): 13/9
No. of diaphragm blades: 7
Minimum aperture: 38 - 45
Closest focusing distance (m): 1.5
Maximum magnification (x): 0.25 (300mm)
AF actuator: Micro Motor
Filter diameter (mm): 58
Max. diameter x length (mm):71 x 114.7
Weight (g): 420
Magnification with Extension Tube EF12: 0.20 - 0.13
Magnification with Extension Tube EF25: 0.36 - 0.29
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