Canon 500D close-up lens (58mm) film winder Nikon Nikkor-M 300mm f/9 lens

Nikon Nikkor-M 300mm f/9 lens in excellent condition

but these too are unlikely to produce any visible effects

it'll keep your squirrel brain from getting too distracted

but there is a little catalog in the box so you can try to order some yourself (offers may not be valid if you’re reading this later than 1957)

Canon 500D close-up lens (58mm) film winder Nikon Nikkor-M 300mm f/9 lensThe Canon 500D lens is a high quality doublet lens designed to work with lenses between 70mm and 300mm focal length. Because this is a thread on diopter, you can use it on any brand of lens with a 58mm filter diameter not just Canon. In excellent condition. Image is for illustrative purposes only. Actual item may differ slightly.