Ron Tolmie
Forum Enthusiast
There are currently very few affordable lenses that can make good use of the 15.1 megapixel sensor in the new 50D. The most notable examples of such lenses are the long L telephotos, but they are much too expensive for most of us.
What we need is a 500mm f/5.6 IS lens that has the same stellar performance as those long L's but is smaller, lighter and not too much more expensive than the popular 400mm L lens. With a 1.4x extender that combination will be superior to the 400mm lens with a 2x extender (with a 10D to 30D) and bare it will be better than the earlier combo employing a 1.4x extender.
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Ron Tolmie
What we need is a 500mm f/5.6 IS lens that has the same stellar performance as those long L's but is smaller, lighter and not too much more expensive than the popular 400mm L lens. With a 1.4x extender that combination will be superior to the 400mm lens with a 2x extender (with a 10D to 30D) and bare it will be better than the earlier combo employing a 1.4x extender.
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Ron Tolmie