DangPhoto.net - Canon EF 100 USM Macro

Not much to be said about this great lens that you haven't heard before. It's well made, has fast, slient USM focusing and life size magnification. It has remarkable BOKEH, gives a reasonable amount of comfort space when shooting insects, and even works great for portraits with it's 2.8 aperture. This lens has a "focus limiter" switch which allows faster auto focusing for normal use. Coupled with a Kenko Pro 300 teleconverter, all auto functions work fine, and gives even more versatility. Note: this lens will not work with Canon's EF 1.4 & 2X converters. And while Canon doesn't recommend using the EF 1:1 Life Size Converter, I've found it works well in manual focus without damage. But use at own risk if you do it yourself. When using some converters, it's necessary to use manual focusing to avoid camera lock up. If using auto focus, "err 99" will result. If this happens, turn your camera off, and back on and the error should clear.

Lens Construction 10 elements in 9 groups
No. of Diaphragm Blades = 8
Minimum Aperture = f/32
Closest Focusing Distance = 0.31 meter
Maximum Magnification = 1:1 without accessories
AF Actuator = USM
Filter Diameter = 58mm
Length x Max. Diameter = 119 x 79mm
Weight = 600g

To maintain the sharpest images, extension tubes offer added magnification without loss of optical quality, but with cost in focus distance. Below is a chart showing the additional magnification gained, and lens to subject distance when used with Canon Extension Tubes. "After market" tubes render similar results.

Magnification

Camera-to-subject distance

Tube Number	near	far	near	far
EF-12	1.19 X	0.12 X	314 mm	1002 mm
EF-25	1.39 X	0.26 X	319 mm	606 mm

More information concerning tubes, and teleconverters.

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Canon EF 100 USM Macro

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