Used Sunpak DX-8R Macro Ring Light Flash
This is a fully manual ring flash, built for 80s film camera, but also perfectly safe to use on modern digital cameras. Just put put the camera in full manual, exposure speed in standard flash sync range, adjust the aperture for depth of field, then adjust the flash power using the slider for the correct exposure.
There’s a bunch of additional information on them over on Flickr here, from when I first bought this flash.
The front ring on the flash is 52mm, but it is supplied with a 52mm-58mm step up adapter so it can be used on the Canon 100mm F2.8 USM macro (new they also came with rings for 49mm & 55mm lenses), others have used them with larger step up rings too.
Fully tested working, there’s a small crack on the front diffuser, but that’s been there the 15 years I’ve owned it and it hasn’t caused any problems. Otherwise I think it is in good condition for its age, just showing a few minor marks here n there.
NB flash stand not included.
This was taken with it some years ago but Canon 400D, Canon EF 50mm F/2.5 Macro @ F18 with Kenko 1.5x Tele-converter & Jessops 31mm Extension tubes, Sunpak DX 8R ring flash 1/16th power. Uncropped