26mm Metal Front Lens cap vintage slip on type

26mm metal lens ring screw in threaded or eye cup piece ring

26mm Optical glass right angle prism 90 degree total reflection measurement

27mm ID Square Rubber eye piece cup ring for eye piece binocular camera

27mm ID to series V 33.3mm metal filter holder adapter w/ Female threads No 53

27mm OD Lens ring adapter vintage

27mm Rear Lens Cap metal screw in type Bell & Howell AUX

27mm Tiffen # 510R Filter holder Retaining Adapter lens Ring for series 5 v 4.5

27mm Tiffen # 510RL Filter holder Retaining Adapter lens Ring for series 5 v 4.5

27mm to 37mm Step Up lens ring adapter screw in threaded

27mm to 37mm Step Up lens ring adapter screw in threaded (chrome)

27mm Walz #105 1A Skylight Filter for Contaflex Tenax

28-80mm AF PROMASTER Plastic 62mm Twist on Lens Hood N101025

28.5mm Carl Zeiss Ikon Close-Up Macro Proxar lens Filter 909 A28.5

28.5mm ID (slip on type) to series V 33.3mm metal filter holder adapter 5 1 1/8"

28.5mm Metal Lens Hood series 5 V 30mm OD for Ziess vintage with case

28.5mm to 33.3mm (screw in) to series 5 V double threaded filter holder 1 5/16"

28mm Eyepiece Coupler adaptor for Microscopes camera or eyepiece

28mm Screw-in Metal Lens Front Cap for 1 1/2" 8mm f1.9 C threads

28mm threaded Lens Hood Shade screw in metal Teleamcon 1 1/2" 8mm

28mm threaded lens with glass diopter

28mm to 37mm Step Up Plastic lens ring adapter screw in threaded

29mm OD to series V 33.3mm metal filter holder adapter w/ Male threads No 55