Lovely! The square bokeh is amazing.To fight an urge of acquiring a new lens, I tried a simple method recently. Took one of my least appealing lens and tried to tweak it to give some added punch. This Color-Revuetar-S lens was very low in contrast and had a lot of glow. So I took it apart and put an iris diaphragm with square aperture placed just after the negative meniscus inside the triplet.
Now the lens is sharper with a square bokeh - but definitely slower than original f2.8. Here is a sample image after the tweak.
View attachment 765247
Thanks. In the past I tried to leverage inherent low contrast and halo in this lens by choosing a pale subject with high key rendering as in the image below. But then I wanted to go beyond that and try something more adventurous like a lens tweak. With this triplet lens it seemed a safe proposition.Lovely! The square bokeh is amazing.