[bojan]

After some more experimenting, I changed the concept somewhat..
This mask has larger area (so diffraction spikes will be more prominent) and when not in use it fits under the original C11 lid.
During exposure, each half of the mask is folded around shaft inside dew cap.
I plan to add the end parts as well, to make the mask completely cover the aperture when used.. but a trouble adding those additional 8 slits and hinges may not be worth really..