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hello i own a canon 500mm lens. if i use the 2x extender on this lens and get to 1000 mm would i have enough light to in the view finder to be able to use this combination? thank you
-- Joel Hood (jgh78@mindspring.com), June 11, 2000
That depends on the brightness of your subject, the speed of your 500mm lens, and the brightness of your focusing screen. Try it out. If you have a typical 500mm f:8 mirror lens, for instance, it should be fine outdoors in most daylight conditions or for the moon.
-- David Goldfarb (dgoldfarb@barnard.edu), June 11, 2000.