Sunagor — manual-focus 28mm f/2.8 wide-angle prime, a rebadged 1980s budget mail-order lens
The Sunagor 28mm f/2.8 is a manual-focus wide-angle prime sold from the 1980s by Sunagor, the Trans-World Trading-owned optical brand better known for binoculars. It was marketed through UK mail order as a cheap alternative to a first-party wide-angle lens.
It is an SC/MC-coated prime, badged 'CD/II' on some barrels, with a manual aperture ring and eight aperture blades. Maximum aperture is f/2.8, stopping down to a small minimum around f/16-f/22 depending on the mount version. Filter thread and minimum focus distance are not documented in surviving sources.
Owners on DPReview's adapted-lens forum note the same optical design was rebadged under several house brands of the era, including Fodor and Albinar, a common practice among Japanese OEM suppliers. Its reputation among vintage-lens users is modest rather than sought-after.
Surviving copies are cheap on UK secondhand sites, most often in Pentax K and M42 fittings with Canon FD and Minolta MD also seen. Check the eight-blade iris for smooth action, confirm the focus ring is not stiff, and inspect the elements for haze and fungus.