Nikon TC-20E III brand_Zoom but pretty compact- and it's

but pretty compact- and it's got a built-in retractable lens hood

Legs are slim

designed for the Voigtlander Ultra Wide Heliar 15mm lenses but suitable for any 15mm (or equivalent)

with pretty decent image quality

and the straight sides make it easy to cut foam to fit (foam is sold separately)

Nikon TC-20E III brand_Zoom but pretty compact- and it'sThe Nikon TC 20E III is an autofocus teleconverter designed for select Nikon AF S telephoto lenses (here's Nikon's compatibility list). Doubles focal length of compatible lenses, at the cost of two stops of light. In excellent cosmetic condition, with good optics and function. Includes caps.