I removed the main lens from the ST280, which was quite easy to do, but the aperture and focusing rings are another story. I decided to just use my Yeenon 18-33mm focus helicoid instead, and it worked out quite well.
Went to Allan Garden yesterday and shot some flowers; wanted to see what the bokeh is like. When I downloaded the pictures and looked at them on the screen, I was wowed and captivated by how beautiful the bokeh was. The French sure knows a thing or two how to design lenses that produce mouth watering bokeh. Wide open, the lens shows some astigmatism on distance objects, but I have not noticed the same effect with close up shots. The center of the lens is reasonably sharp wide open, but with low contrast. Stopping down improved sharpness markedly and the astigmatism is gone by about f4, at least at the middle of the frame. The long edges aren't great even at about f8, but passable. You will be disappointed if you care about the edge sharpness. But I think the strength of this lens lies in its gorgeous colour and bokeh rendering. Seriously, I could lose myself in it.
All lenses below were taken with the Angenieux 45mm f2.8 and Sony A7: