Hypersensitizing Commercial Panchromatic Plates
Hypersensitizing Commercial Panchromatic Plates
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cent, to white light and nearly 400 per cent, to the red. Through the Minus Blue filter one of the Ilford plates is increased 300 per cent.
These plates were used in experiments in airplane photog- i8 SAMUEL M. BURKA.
raphy, where for photographing through the haze a fast red- sensitive plate is necessary. Fig. 1 8 is a set of prints from the II ford plates. Prints a and b were printed for the same time from the untreated and treated plates. Print c is from the un- treated negative timed to giv...e the best print. The negatives were given the same exposure in the air and were exposed within a few seconds of each other through the Acinus Blue filter.
FIG. I8a.
AMMONIATED PLATE. PRINTED 21 SECONDS. Hypersensitized Ilford plate. 1 J U second exposure. Minus blue filter. Oblique from 4, 000 feet.
The increased speed of the treated plate is apparent. It will be seen, also, that the treated plate is less contrasty and gives much better detail in the shadow's.
Fig. Iga is from a Seed 30 plate used with no filter at an altitude of 17, 000 feet on a slightly hazy day.
What to read after Hypersensitizing Commercial Panchromatic Plates?
You can find similar books in the "Read Also" column, or choose other free books by Samuel Moses Burka to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
cent, to white light and nearly 400 per cent, to the red. Through the Minus Blue filter one of the Ilford plates is increased 300 per cent.
These plates were used in experiments in airplane photog- i8 SAMUEL M. BURKA.
raphy, where for photographing through the haze a fast red- sensitive plate is necessary. Fig. 1 8 is a set of prints from the II ford plates. Prints a and b were printed for the same time from the untreated and treated plates. Print c is from the un- treated negative timed to giv...e the best print. The negatives were given the same exposure in the air and were exposed within a few seconds of each other through the Acinus Blue filter.
FIG. I8a.
AMMONIATED PLATE. PRINTED 21 SECONDS. Hypersensitized Ilford plate. 1 J U second exposure. Minus blue filter. Oblique from 4, 000 feet.
The increased speed of the treated plate is apparent. It will be seen, also, that the treated plate is less contrasty and gives much better detail in the shadow's.
Fig. Iga is from a Seed 30 plate used with no filter at an altitude of 17, 000 feet on a slightly hazy day.
What to read after Hypersensitizing Commercial Panchromatic Plates?
You can find similar books in the "Read Also" column, or choose other free books by Samuel Moses Burka to read onlineMoreLess
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