ORWO UP15

ORWO UP15 is the reversal cousin of NP15. UP in the ORWO naming system stands for Umkehrfilm Panchromatisch, and the 15 is 15 DIN, which converts to ISO 25. It was designed as a 2x8mm Double-8 black and white cine reversal film for home movie work, processed by ORWO-approved labs against a return envelope that came in the box. The factory leaflet just said "special laboratories" and gave you the address.

In the East German consumer market through the 1970s and 1980s, UP15 was what hobbyists loaded into their Pentaka 8 cameras and the Krasnogorsk-derived Soviet cine bodies that crossed the border under barter agreements. Production ran out of VEB Filmfabrik Wolfen through 1994, when the company was liquidated and the surviving B&W operation continued as Filmotec under license from ORWO Net.

A practical quirk: although UP15 is labeled reversal, photographers who run it through a normal D-76 or Rodinal negative process get a usable black and white negative back. The colloidal silver anti-halation layer turns black during fixing rather than staying clear, which gives a strange look on the base side but the image side works. People who have shot expired rolls in still cameras (it is just 35mm slit to Double-8 width on the underlying master, so 35mm cassettes appear in older stock too) report fine grain and reasonable shadow detail, with the high contrast typical of a reversal emulsion processed as negative.

The practical comparison is to Foma R100 in the reversal cine market today, or to Adox CMS 20 II if you only care about the resolution and not the cine workflow. UP15 was never going to win on resolution: it was a consumer cine film, engineered for projection, not for enlarger printing.

Format in original production was Double-8, with limited 16mm runs. Nothing is currently made under the UP15 name. What turns up on eBay is forty-year-old stock at varying levels of fog and base-color shift.

The reciprocity exponent is 1.33. Zone Light Meter applies the correction past one second on the standard curve. A 10-second meter reading runs to about 23 seconds at the negative; a 30-second exposure climbs to roughly 96 seconds. For a cine film built around 1/24-second per frame exposures, anything past a second was not a design consideration, so the correction is more cautionary than calibrated.