I have been using the Canon 7D since September 2009 and I am still amazed by this technological marvel. I have been a longtime Canon user (going back to the Canon EOS 630) and I have seen improvements in every generation of cameras. Over the years, I have built a great collection of Canon lenses. But, there was always one lens which disappointed me — the Canon 100-400mm L. Sure, it is only a f/4.5 @100mm and only f/5.6 @400mm, but the range is great for its size (approx. the same size and weight as the Canon 70-200mm f/2.8 IS). I always thought the images looked flat.
When I purchased the 100-400mm L, I had the Canon 20D. I purchased the lens just before an eclipse and was hoping for some great shots. Instead, the pictures looked more like a fuzzy dirty ball. The 20D would not give an AF Lock with the 1.4 Extender attached, so it was strictly manual focusing using the viewfinder. No such thing as Live View back then. I used the lens a few other times for some nature photography and it was always a mixed bag. Eventually, I decided that the lens was just not worth the carrying weight and sentenced it to the closet.
When the 7D was released, I started seeing some great photos and videos taken with the 100-400mm L. I pulled it out of the closet and gave it another try. Was I surprised! I used the lens in my New York City Lights video with great results. So, I decided to address that 5-year old ghost and take a picture of the moon. You can see the results below taken with the same Canon 100-400mm L lens and Canon 1.4 Extender II. (There is approx. 45degree rotation between the two images.)
The detail in the 7D image is amazing. I was able to get a AF Lock using @400mm with the 1.4 Extender attached and the Live View was a big help. The 7D image was taken in Manual mode using 200 ISO @ f/8 and 1/500 shutter during a clear night sky. I did experiment with a few setting combinations, but I liked the above image the best.
And no Monoliths on the moon! I am still a little disappointed in that.