Canon has such wonderful lenses... but at a price. I love the stabilizer in my 2.8/70-200 lens, but everything beyond that gets really expensive. On eBay you find a lot of cheap telephoto garbage, typically no-name 500mm/1:8 lenseswith a T2 adapter, and some terrible mirror lenses, many of them from Russia with love but no quality control. That's not on option. Adapting OLD telephoto lenses like in the good old days might be an option. What kind of lenses would you recommend if sharpness and contrast are the main issues?