Piesker Picon 135 2.8:
forgotten lens maker from Berlin-West
Piesker lenses had some brandings:
PICON, ASTRA, ASTRANAR, VOSS, VOTAR
TELEGON, KALIMAR
Shown example: Piesker Picon 138/2.8:
Nr. 93226
Blades: 16
Filter size: 52 mm
Shortest focus distance: 2.5 m
Mounted at Pentacon bellow Made in GDR.
Its easy to mount the bellow at the M42 adapter!!!
The Bokeh:
Always circles are formed not only in the mid but also in the rim area.
The lens construction is not known,
might be a Triplet like Triotar 100/2.8 from Meyer?
LINK: Lens Design: Triplet and more: wiki
Examples:
BonFireHeart
SwingBothWays
Of course, like with all lenses,
you can use it for art work
MoveInTheRightDirection
Fotounification, thanks to Muncaski Martin
IamWhatIam
Fotounification, thanks to Peter. H. Fuerst
Its just a fun to play with 60 years old lenses:
They have a own soul, e.g. Bokeh development.