Canon EF 85mm f/1.8 USM

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Canon EF 85mm f/1.8 USM

From the manufacturer

A highly practical medium telephoto lens with superb delineation and portability. Images are sharp and clear at all apertures. Through computer simulations, the lens has been designed to give beautiful background blur. Since the front lens group does not rotate during focusing special filter effects are not affected.

url to full description on Manufacturer's web site.
From Wikipedia

The EF 85mm f/1.8 USM is a consumer level lens. It is the shorter sister to the EF 100mm f/2.0 USM, and is designed very similarly. It is constructed with a plastic body and a metal mount. This lens features a distance window with infrared index. An 8 blade, maximum aperture of f/1.8, gives this lens the ability to create depth of field effects. The optical construction of this lens contains 9 lens elements, without any special lens elements. It uses an internal focusing system (meaning that the front of the lens neither rotates nor extends when focusing), powered by a ring type USM motor. Auto focus speed of this lens is very fast.
In addition to portraiture, the lens is also suited for indoor sports photography, particularly on a cropped sensor, due to its focal length, fast autofocus, and fast aperture, and for photos in social situations, due to its fast aperture (thus usable in dark interiors) and quiet operation (hence minimizes disruption).
In terms of aberrations, the lens suffers from noticeable vignetting when used wide-open on full frame cameras, though this is significantly reduced when used on a cropped sensor or stopped down to f/2.8 or f/4. The lens also suffers from purple fringing in high-contrast lighting, such as chrome, water, and black-and-white.[3][4]

url to full article on Wikipedia.
MSRP 419 US$ Aperture (large) f/1.8
Announced 1992 Magnification 0.13x
Length 71mm Minimum focusing distance 0.85m
Weight 425gr Focal 85 mm
Filter diameter 58mm Diaphragm blades 8
Manufacturer Canon Color Black
Mount Type Canon EF Category Prime, Standard
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WEathersealing, CIrcular aperture, FUll time manual focus, STabilization, FT:Filter threads, COnstant minimum aperture,
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2015-03-11T05:54:48+00:00