[Brightcolours]

Thanks JoJu for the link:

 

     OK ,so is this element semi opaque ....is it graduated opaque.... at the edges......are we talking a reduction in T stops here?

 

 Airydiscus......where art thou?


    Manual focus and no camera communication is one thing, but no automatic diaphragm would be just a step beyond frustration, like that 2:1 macro! 

Yes, that is why there is such a big difference between f-value and T-value. The apodiation element is the cause.

 

No automatic aperture is not a big deal with this lens, as it will mostly be used wide open or close to wide open. Just like it is no big deal with my adapted 55mm f1.2 lenses for instance. The purpose of the lens is portraits with shallow DOF and smooth bokeh.