Comparing 10 of the most popular vintage 50mm lenses you can easily find, all of which can be bought for under $100.
List of the lenses compared in the video below:
Nikon Nikkor AIS 50mm f1.4 Here
Nikon Nikkor AI 50mm f/1.8 Here
Canon FD 50mm f/1.8 Here
Canon FD 50mm f/1.8 S.C. Here
SMC Super Takumar Asahi M42 50mm f/1.4 Here
SMC Pentax-M Asahi 50mm 1.4 Here
Olympus Zuiko OM 50mm f/1.8 Here
Minolta Rokkor MD 1.4 Here
Minolta Rokkor MD 50mm f/1.7 Here
Contax C/Y Planar T* 50mm f/1.7 Here
Thanks to Tuber Denae & Andrew for the great vintage lens video.
Also see different Top 5 50mm Vintage Lenses.