via Personal View.
Two readers and Digitfoto had a talk with the guys from the German B.IG. company that developed the BIG shift lens. They confirmed that the lens is indeed directly based on the [shoplink 33839 ebay]Voigtlander Heliar 15mm f/4.5 (here on eBay)[/shoplink].
Reminder…these are the specs:
|Specifications BIG Shift Lens 4,5 / 15 mm MFT|
|Focal length||15 mm (equivalent to 30 mm film)|
|Lens construction||8 elements in 6 groups|
|Focus Limit||50 cm|
|Filter thread||52 mm|