Canon Macrophoto Coupler FL 55mm brand_Lightware but this is still an

but this is still an unusual little lens

which doesn’t affect viewfinder function but will prevent other accessories from mounting to the top of the viewfinder

the numbers in brackets are approximate interior size in cm (diameter x depth)

ET-86 lens hood

The base has a 3/8" inner thread for attachment to tripod or head

Canon Macrophoto Coupler FL 55mm brand_Lightware but this is still anThe Canon Macrophoto Coupler FL 55mm is a lens reversing adjustable extension tube designed for macro use. You can use it directly on camera or on bellows its totally up to you. Attaches to FD FL cameras and lenses with 55mm filter threads. In excellent condition, with box. Lens, camera and bellows are sold separately.