Will this lens work with a Canon 40D?
Hi: I have found the Canon L Series 300 mm F4 lens to be very good.; I use it when I shoot butterflies and dragonflies and it allows me to get close to these creatures that are a bit sensitive. I often use a tube to allow even close use. Also, I shoot a lot of birds from a moving boat. The 300 with the 1.4 converter is a perfect match. If I use my 500 mm Canon lens, I have to be on tripod and the movement of the boat makes is impossible to get a good shot. The 300 is a good, if not great lens. Buy it. Wayne Easley