Canon Demi 28mm/2.8 contributed as a sacrifice

I feel isolated staying at home following the suggestion by the Authority.
Killing free time, Canon Demi 28mm/2.8 old camera was operated to transplant its heart, marvelous lens. Original Iris construction should be done as it is at the beginning, 28mm forcal length has enough depth to ordinary use if iris is fully opened. So, deserted I the iris function. Though it's image circle is so designed to meet with half sized format, even full size format is acceptable under some endurance on vignetting at the corner a little.
Utilizing original helicoid, 4.40mm extension makes it possible to shoot 235mm close up at 1/6.8 magnification, now macro is necessary?
In spite of an Indigenous is in my stock, Canon 30mm/1.7 belonged in Canon Demi-17, this smaller Canon daughter would be invited without any quarreling.