What’s your favorite telephoto focal length? While I own several 85, 90, 100 and 135 mm lenses, I always feel home at 100mm. For me it’s the best compromise of size, weight and compression. This 100/2 Canon FD is desirable for size and weight, my Leica Apo 100/2.8 is bigger, slower but so far ahead in image quality, I don’t even dare to compare them. 100mm is also a great match for 35mm, which is the focal length I use the most. With those two I can do almost anything I need.