Prinz — faster preset portrait telephoto lens, Dixons own-brand, M42/T2/Pentax K fit
The Galaxy 135mm f/2.8 sat above the slower f/3.5 model in Dixons' Prinz-branded preset telephoto range, offering a faster maximum aperture at the same short-telephoto portrait focal length. Like other Galaxy lenses it was Japanese-made and sold through Dixons in the UK during the 1970s.
Most surviving copies are in M42 screw fit, with a T2 base variant and factory Pentax K bayonet examples also documented, the latter marked 'KE Japan' on the mount. The lens uses a preset aperture ring rather than an automatic diaphragm, stopping from f/2.8 to a small minimum, on an all-metal barrel.
As a faster short telephoto it suits portrait work, rendering soft, low-contrast images wide open that firm up by mid apertures. The preset control means setting the working aperture first, then closing the ring before shooting, slower than automatic-diaphragm portrait lenses of the period.
Copies sell cheaply on the UK used market, typically £10 to £25. Checks should include smooth, un-sticky preset ring action, glass free of the fungus these lenses can suffer after decades of storage, and a firm, non-wobbly fit between the barrel and whichever mount adapter is attached.