Upload & Sell: Off
Hi ZoneV, thanks for tips, I spent hours to disassemble and re-assemble to check all the possible faults , that may cause oblique, stray rays and other things thoroughly but sadly couldn't find.
I used OEM Pentax-K mount and 2 equal shims, I drilled more 3 holes to match C/Y lens's rear holes, everything seems done accurately.
That thing not happens to other converted lens like Apo-Makro-Planar.
Strangely that, when I couple converted C/Y 18mm to my Sigma SD9, no bands there.SD1 and SD9 cameras are almost the same in constructions, the main difference are : the sensor resolutions and maybe microlenses ( that SD9 doesn't have).
May my case becomes a warning about SA conversion? Thanks man.