Federal Octar 5.5 inch f6.3 enlarger lens lens mount_Nikon S and a swivelling rear screen

and a swivelling rear screen

Lomography ISO 200 "Tiger" Colour Negative film for 110 cartridge cameras

This premium Novoflex adapter lets you use Nikon F mount lenses (with or without an aperture ring) on your Sony E-mount mirrorless camera

but usable

6 lens is in excellent condition

Federal Octar 5.5 inch f6.3 enlarger lens lens mount_Nikon S and a swivelling rear screenThe Federal Octar 5. 5 inch f6. 3 lens is designed for use on an enlarger or bellows. It appears to be a 34mm thread mount. Some wear on aperture dial, dust and minor haze on the optics, diaphragm blades have some fluid and wear that won't impact function.