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References

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  1. Loyd A. Jones, “The Evaluation of Negative Film Speeds in Terms of Print Quality,” J. Frank. Inst. 227, 297, 497 (1939).
    [Crossref]
  2. Clifton Tuttle, “Methods and Instruments for the Determination of Photographic Speeds by Measurement of Relative Characteristic Gradients,” J. Opt. Soc. Am. 29, 267 (1939).
    [Crossref]

1939 (2)

Jones, Loyd A.

Loyd A. Jones, “The Evaluation of Negative Film Speeds in Terms of Print Quality,” J. Frank. Inst. 227, 297, 497 (1939).
[Crossref]

Tuttle, Clifton

J. Frank. Inst. (1)

Loyd A. Jones, “The Evaluation of Negative Film Speeds in Terms of Print Quality,” J. Frank. Inst. 227, 297, 497 (1939).
[Crossref]

J. Opt. Soc. Am. (1)

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Figures (19)

Fig. 1
Fig. 1

Curve A, the D-log E characteristic with points indicating the portions used for making the first excellent print. Curve B, the first derivative of Curve A.

Fig. 2
Fig. 2

Print of Willow Pond test object.

Fig. 3
Fig. 3

Print of Beach Scene test object.

Fig. 4
Fig. 4

Print of Woods Scene test object.

Fig. 5
Fig. 5

H & D curve for the print series 3.

Fig. 6
Fig. 6

H & D curve for the print series D2.

Fig. 7
Fig. 7

Correlation between print speed and (a) 0.2 density speed, (b) 0.1 density speed, (c) 0.3 G ¯ speed.

Fig. 8
Fig. 8

Correlation between print speed and inertia speed.

Fig. 9
Fig. 9

Correlation between print speed and (a) density=0.03 speed, (b) gradient=0.19 speed.

Fig. 10
Fig. 10

H & D curve for negative material 117 (DK-50, 7 min.).

Fig. 11
Fig. 11

H & D curve for negative material 134 (DK-50, 7 min.).

Fig. 12
Fig. 12

H & D curve for negative material 137 (DK-50, 7 min.).

Fig. 13
Fig. 13

H & D curve for negative material 164 (DK-50, 7 min.).

Fig. 14
Fig. 14

Correlation between the 0.3 G ¯ speed and (a) 0.2 density speed, (b) 0.1 density speed, (c) DIN speed (DIN developer).

Fig. 15
Fig. 15

Correlation between DIN speed and 0.1 density speed (DIN developer).

Fig. 16
Fig. 16

Correlation between 0.30 G ¯ speed and inertia speed (DIN developer).

Fig. 17
Fig. 17

Correlation between the 0.3 G ¯ speed and (a) 0.2 density speed, DK-50 developer, (b) 0.1 density speed, DK-50 developer; (c) correlation between the 0.3 G ¯ speed in DK-50 developer and the DIN speed in DIN developer.

Fig. 18
Fig. 18

Correlation between 0.3 G ¯ speed and inertia speed (DK-50 developer).

Fig. 19
Fig. 19

Correlation between DIN speed in DIN developer and 0.1 density speed in DK-50 developer.

Tables (5)

Tables Icon

Table I Data showing correlation between minimum and average negative gradient. K=Gmin/ G ¯.

Tables Icon

Table II Data showing agreement between statistically and sensitometrically determined effective camera speed values.

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Table III Picture tests. Data from first excellent negatives.

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Table IV Information relative to the negative materials.

Tables Icon

Table V Summary of correlation data. First excellent print speeds.

Equations (1)

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K = G min / G ¯ .