I'll soon be purchasing the Canon 100-400MM L IS. I may also purchase the Canon 1.4 TC. What should I expect as far as auto-focus and IS functionality. I've searched photo.net but did not find specifics on this combination. I understand AF would work only in bright situations and sharpness would be compromised with the TC. They'd be used on my 10D mostly for wildlife, birds, other nature photography, the moon etc. I own a solid but old and heavy tripod. Someday, the lenses may be used on a 5D or its replacement. If anyone can point to images made with this lens and 1.4 TC that would be great. Thanks in advance, J.