Canon 50mm 1.8 LTM - mainly at night - Photo Thinking - Lens Review
Sony FE 50mm f/1.8 Lens with UV Filter Kit B&H Photo Video
Canon EF 50mm f/1.8 STM Lens 8PC Accessory Bundle – Includes Manufacturer Accessories + 3PC Filter Kit (UV + CPL + FLD) + Lens Cap Keeper + MORE – International Version (No Warranty) - Walmart.com
Which filter size should I buy to fit a 50mm lens? - Quora
Amazon.com : Canon EF 50mm f/1.4 USM Standard & Medium Telephoto Lens with UV Protection Lens Filter - 58 mm : Electronics
Canon RF 50mm f/1.8 STM Lens with Filter Kit, Cleaning Kit 4515C002 AK
Nikon 50mm f/1.8G Review
Amazon.com : Nikon AF-S FX NIKKOR 50mm f/1.8G Lens with Auto Focus and Circular Polarizer Filter - 58 mm : Electronics
Nikon AF NIKKOR 50mm f/1.8D Lens for Nikon DSLR Cameras with Accessori – The Teds Store
Canon FD 50mm standard lenses
Olympus Zuiko 50mm f/1.8 Manual Focus Lens for OM-Mount {49} at KEH Camera
Canon EF 50mm f/1.8 Review
Amazon.com : 49mm 7PC Filter Set for Canon EF 50mm f/1.8 STM Lens - Includes 3 PC Filter Kit (UV-CPL-FLD) and 4PC Close Up Filter Set (+1+2+4+10) : Electronics