Asahi Close-Up Lens T80 (52mm) brand_Kenko and that's what this is

and that's what this is

The Gossen Lunasix F is a good quality meter with excellent low light sensitivity and a unique exposure-setting system: rather than matching a number on the display to the calculator dial

Can't find specs for this

This is an AI-S lens

but does have some minor separation along the edge of the rear group and a few very minor cleaning marks on exterior surfaces

Asahi Close-Up Lens T80 (52mm) brand_Kenko and that's what this isThis is an original Asahi close up diopter for any lens with a 52mm filter thread doesn't have to be an Asahi. Provides extra magnification for close up photography. In excellent condition.