Canon EF 50mm f/2.5 Macro

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Canon EF 50mm f/2.5 Macro

From the manufacturer

A superior-performance lens offering excellent optics and focusing from infinity down to one-half life size (0.5x). Its nine-element design features a floating optical system, which ensures top-notch performance even at close focusing distances. Light and compact, it functions beautifully as a general-purpose normal lens. The optional accessory Life Size Converter EF enables focusing down to life size (1:1), and actually increases working distance - very desireable in close-up shooting.

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

The EF 50mm f/2.5 Compact Macro is a relatively inexpensive macro lens with a minimum focusing distance of 23cm (9 inches) offering a maximum magnification of 0.5x actual size.[9] Reviewers describe the lens as having "decent"/"mid-level" build quality, with very good color and contrast, "absolutely negligible" distortion, very sharp after f/4 and peak performance at f/5.6. However, auto-focusing is relatively slow and noisy.[11][12]
The maximum 0.5x magnification means this lens is more suitable for photographing documents, products and objects at least 5cm (2 inches) wide than small insects etc. The outer barrel is grooved to accept Canon's MR-14 ring flash which can be used as the principal light source for close-ups or as on-axis fill lighting for portraits. The six-blade diaphragm provides reasonably good out-of-focus blur (bokeh) for portrait work.
First introduced in 1987, it is the oldest lens in Canon's current lineup (as of January 2014) that is still available new.[13] The lens is constructed with a plastic body and metal mount, and features a distance window with infrared index and magnification markings. The optional Life-Size Converter EF[14] adapts the lens to produce a maximum magnification of 1:1. Attaching the converter increases the lens focal length to 70mm, reduces the maximum aperture to f/3.5 and limits the focal range. Magnification markings for the converter are shown on the (extending) inner lens barrel.

url to full article on Wikipedia.
MSRP 299 US$ Aperture (large) f/2.5
Announced 1987 Magnification 0.50x
Length 63mm Minimum focusing distance 0.228m
Weight 280gr Focal 50 mm
Filter diameter 52mm Diaphragm blades 6
Manufacturer Canon Color Black
Mount Type Canon EF Category Macro, Prime, Standard
Published reviews
Review HA SA VI ME
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HAnds-on, SAmple images, VIdeo, MEasurements.
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WEathersealing, CIrcular aperture, FUll time manual focus, STabilization, FT:Filter threads, COnstant minimum aperture,
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2015-03-11T05:30:37+00:00