Mamiya RB67 No.1 Extension Tube  type_Projectors This is a good quality

This is a good quality Nikon Y48 yellow filter in the original

This Kenko DG extension tube set includes 10mm and 16mm tubes which can be used together or separately to provide substantial close-up capability with most Micro Four Thirds lenses (sold separately)

The Fujifilm GFX 50R is a 50mp medium format digital camera in a rangefinder-style form factor

with smooth focusing

Mamiya RB67 No.1 Extension Tube &nbsptype_Projectors This is a good qualityIf your RB67's bellows extension isn't taking you quite as close as you'd like to go, this 45mm extension tube will provide a fair bit of extra magnification. Good working order, minor cosmetic wear.