Bokehmon
OK I only have the vaguest of ideas of what I just referenced but it sounds good. I took some more images with the 200mm 1:3.5 Takumar as well as the 55mm 1:1.8 SMC Takumar mounted to my Pentax K10D. The 200mm lens has 18 aperture blades that form a near circle. Contrast this to a lens with only 5 blades and you can see the reason why the out of focus areas are so smooth and have that quality referred to as good Bokeh.
Being an older lens it doesn’t have the coatings the help to mitigate internal reflections and flare so I’ve used that fact to highlight it and give that feel of yesteryear to some of my images. I will show some more images in a future post.