SPUR UFG is a 135 black and white film, 36 exposures, with ultra-fine grain. Box speed is ISO 50, but the working speed moves: the maker states a range of ISO 40 to ISO 80 and a push to ISO 160 — all of it in the dedicated two-component SPUR UFG-1 developer.
How the picture looks
The emulsion resolves 287 line pairs per millimetre at 1000:1 contrast and 101 pairs at 1.6:1. That is higher than the best fine-grain general-purpose films. Its spectral sensitisation reaches far into the red, so the film can stand in for an infrared stock.
Why the developer is not optional
The emulsion was originally made for aerial photogrammetry, not for pictorial work. In ordinary developers it gives neither high sharpness nor a usable characteristic curve — which is exactly why the maker tailored the UFG-1 developer to it. Without that developer the film performs worse than a cheaper ISO 100. Plan to buy the two together, or take the ready-made UFG-Kit.
What to shoot on it
Anything where the resolution ceiling genuinely matters: landscape destined for a large print, architecture, copy work, technical photography. A tripod and good glass show a visible difference here, because the film stops being the weak link.
Processing and scanning
Standard black and white processing, but in SPUR UFG-1 — take the times from the maker’s sheet for your batch. When scanning, leave software sharpening off: this film has sharpness to spare, and sharpening only drags up grain that is barely there.
How it compares
Its closest neighbours are document films such as SPUR DSX: higher resolution still, but likewise a single possible developer and a much narrower latitude. If you do not need the ceiling, an ordinary ISO 100 is simpler and cheaper in every respect.
