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SENSITIVITY
and RESOLUTION OF SOME FILMS ( logaritmic skale ) |
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written
october 1984 (when digital cameras were still a dream...) |
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Curve of
inverse square proportionality for imaginary equivalent films |
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(quadrupling
the sensitivity cuts in half the resolution) and distribution of real films. |
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Reference
films: Agfapan 400 or Kodak Tri X (400 ASA, 100 línes/mm, big star). |
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25 |
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40 |
50 |
64 |
80 |
100 |
125 |
160 |
200 |
250 |
320 |
400 |
500 |
640 |
800 |
1000 |
1250 |
1600 |
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3200 |
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2500 |
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2000 |
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S |
1600 |
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Agfapan Vario XL (125 to 1600 ASA) |
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Ashgray Light |
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E |
1250 |
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Kodak Royal X Pan |
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N |
1000 |
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S |
800 |
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I |
640 |
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T |
500 |
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I |
400 |
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Agfapan 400... |
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...and Kodak Tri X |
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V |
320 |
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better films |
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I |
250 |
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T |
200 |
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Agfapan 200 |
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Kodak TP 2415 Hypered (200 ASA) |
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Y |
160 |
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Omega Centauri |
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125 |
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Agfaortho 125 |
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Kodak TP 2415 (125 ASA) |
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A |
100 |
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Agfapan 100 |
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S |
80 |
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worse films |
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A |
64 |
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50 |
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SENSITIVITY and RESOLUTION : THE DATA are REFERRED to the CENTERS of the
SQUARES. |
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I |
40 |
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S |
32 |
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Kodak Panatomic X |
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O |
25 |
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Agfaortho 25 |
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25 |
32 |
40 |
50 |
64 |
80 |
100 |
125 |
160 |
200 |
250 |
320 |
400 |
500 |
640 |
800 |
1000 |
1250 |
1600 |
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IIIIIIIIIIIIIIIIIIIIIIIIIIII R e s o l v i n
g p o w e r - l
i n e s / mm
IIIIIIIIIIIIIIIIIIIIIIIIIIII |
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N O T E S |
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The
Agfaortho 25 is for the Sun best suited (photosphere) |
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and ideal
for this use, since his low sensitivity is an advantage in this case. |
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The Agfaortho 125 is replaced with advantage by the TP-2415, |
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which has
higher speed and higher resolution. |
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The Panatomic X is not suited for lunar and planetary photography. |
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The Agfapan 100 and 200 are also replaced with advantage by the TP-2415. |
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The Royal X Pan is
inferior than the Vario XL, which has better sensitivity and resolution. |
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The Vario XL is a very
interesting film. It has lower resolution and contrast than TP-2415, |
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but it has a
10x higher speed, and a great exposure latitude. |
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It makes possible to photograph the
planets with 10x shorter exposure times than TP-2415 |
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