In the 60s and 70s some cameras were sold as kits, a body, 35mm and 135mm, I bought a used Spotmatic in 1967 in Long Beach Ca. at a pawn shop that catered to Navy enlisted, it came as a kit, with 35mm 3.5 and 135 2.8 (or was it a 3.5. need to check.). In the day it was thought that the 135, other than a head shot, too long for portraits working distance was too distant, and too short for useful tele. As a PJ I tend to agree, a 200 is fine for tele, a 100 or 105 was my normal lens. The 135 became the defacto tele for weekend shooters, a compermise when someone could only afford one lens. The brands sold many more 135mm than 100 or 105s, My current A mount 135 2.8 works well on cropped sensor Sony with full frame will use a 200 2.8 or 70 to 200 2.8 Zoom. My G zoom is sharp, has good contrast, but the prime is a bit sharper and lighter. The old Life Time photogprhjay books, the editon for Nature Photography advised skipping the 135 and 200 and get a 300 for wildlife.