Oval aperture inside is f/2.8 for both the Helios and Jupiter, and f/4 for the Mir, but the regular aperture for all of them work just fine, this way you can fine tune how much amber tint you want passing through. The wide-open aperture makes everything look like golden hour. Designed to fake an anamorphic look with oval bokeh and horizontal streak flare. All lenses come with 3d-printed seamless focus gear.
M42 mount, fitted with rotating EF adapters so you can easily re-orient the flares and bokeh.