From these results, the film shines as a prime focus film rendering more technically accurate hydrogen clouds and planetary nebula colors. Star colors are superb with this film at prime focus as well, revealing an entire spectral range of colors and intensities. Prognosis: This films a keeper for Prime focus work, but the green response overwhelms the background when shooting wide angle and in light pollution. ** Tests with OPT provided "Centuria 400" indicate this film has the same spectral response and contrast. Instrument: 12.5 inch f/5 Newt, Pentax K1000 Platform: Astrophysics AP1200 Film: Konica Cent. 400 Exposure: 45 mins Filters: NONE Location: Payson, Arizona Elevation: 5150 ft. Sky: Seeing 8/10, Transparency 8/10 Outside Temperature: 25 C Processing: Photoshop.
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