Quote Originally Posted by neuroanatomist


you can add a thin non-Canon extension tube and use an EF-S lens on an FF body. Or use a 3rd party reduced image circle lens. Canon has decided not to allow branded combinations that produce images like [url="http://farm4.static.flickr.com/3537/3548486997_90ca11eebd.jpg]this[/url]. That's their choice. There are workarounds, if you choose to go that route.
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Have you ever added the minimum length extensiopn tube to a 17-55mm lens and placed it on a FF?


I have, and, on my 5D MK II, I can focus out to about 12 inches. Thats really useful advice for someone who is trying to learn.