ADDITION: AGFA - Region 'A' - Blu-ray (August 2017): AGFA stands for 'American Genre Film Archive' with the statement "The American Genre Film Archive preserves the orphan films that are moldering in storage units or being disposed of into the dark abyss of the ocean. Regardless of "artistic" merit, these movies are important. And fun! " They are non-profit.

This is cited as a "New 4K scan from the only surviving 16mm blow-up elements". So, yes, it was obviously shot in 16mm and the new 1080P transfer looks easily superior to the older SD with much more grain, realistic, warmer, colors (skin tones), a brighter image with more detail and and no compression artifacts. The best thing about 16mm to HD is the texture which is lush and thick - moving around the visuals like a swarm of bees or as if it is being projected on shag carpet. There is some frame-specific damage and visible cue-blip markers (see last captures.)

Audio is transferred in a DTS-HD Master 2.0 channel (16-bit) and seems a solid representation of the films production limitations. There certainly are aggressive sequences but the lack of depth is more a factor of the original shoot. There is no credited score, or music at all - aside from some radio, and the dialogue and background sounds are authentically flat. There are optional English subtitles on the Region 'A'-locked Blu-ray disc.

Extras start off with a commentary track by director Tom Hanson and producer Manny Nedwick hosted by AGFA's Joseph Ziemba and Sebastian del Castillo in which they discuss raising funding by selling Pizza Man franchises and shot on-the-fly with the goal of getting the film in the can in order to get it on the screen when they would try to catch the killer with a Kawasaki motorcycle drawing by matching handwriting on a raffle ticket to letters sent to the San Francisco Chronicle's Paul Avery. Hanson also covers the same material in a short video interview. There is no trailer for the film but "Tabloid-Horror Trailers from the AGFA Archive" includes trailers for CARNIVAL OF BLOOD, THE MANSON MASSACRE, THE OTHER SIDE OF MADNESS, THREE ON A MEATHOOK, and THE TOOLBOX MURDERS. The disc also includes the bonus feature ANOTHER SON OF SAM which is an incredibly dire in-name-only cash-in about an escaped asylum inmate who holds girls hostage in a college dorm. An included booklet features an interview with Hanson by Chris Poggiali (a more complete version of which appears on his blog Temple of Schlock).  

The Zodiac Killer has some value - especially those keen on the history after watching Fincher's, popular, film; Zodiac. Certainly, the meager roots of The Zodiac Killer export vérité realism and it can be uncomfortable in its creepiness. The Blu-ray provides significant value exposing this niche effort to the light of HD - and, hopefully, a whole new viewership. I'm pleased to see films like this obtaining BD attention now - another great attribute of the format... let's have more!

1) Something Weird Video/Image Entertainment (Sharpshooter Triple Feature) - Region 0 - NTSC - TOP

2) AGFA/Something Weird Video/MVD Visual - Region 'A' - Blu-ray - BOTTOM