Holga Lens with SLF Turret for Canon EF brand_Thinktank It has Nikon's Matrix metering

It has Nikon's Matrix metering system (including 3D Matrix with D-type lenses) and shutter speeds from 30s to 1/8000s

This lens is for the Pentax K mount

and associated lenses and accessories for the M system

it's not half bad

It will not work on an EF-mount camera

Holga Lens with SLF Turret for Canon EF brand_Thinktank It has Nikon's Matrix meteringThis awkwardly named device is a Holga DSLR lens with its focusing mechanism removed and a frankly kind of sweet special effects filter system attached instead. The "SLF turret" accepts two special effects wheels (included) which include a range of colour and prismatic effects. You rotate the wheel to slide a new filter effect over the end of the lens, and you can swap them in seconds with a clever magnetic attachment system. It's a lot more slick