ISO 2240:2003

Name: ISO 2240:2003 — Photography — Colour reversal camera films — Determination of ISO speed
SKU: ISO 2240:2003
Price: 14400 RUB
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Photography — Colour reversal camera films — Determination of ISO speed

Название (английский):

ISO 2240:2003

Photography — Colour reversal camera films — Determination of ISO speed

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 8
Дата публикации:: 22 октября 2003 г.
Издание:: ISO IS 2240 edition 4 version 1
ICS:: 37.040.20

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Описание (английский):

ISO 2240:2003 specifies the method for determining the ISO speed of colour reversal camera films producing continuous-tone pictorial images that are intended to be viewed on transparency illuminators or by projection as slides. It also applies to 8 mm and 16 mm motion-picture films used in non-professional applications. ISO 2240:2003 is not applicable to professional motion-picture films regardless of their applications.

Abstract

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Overview

ISO 2240:2003 specifies the standardized method for determining the ISO speed of colour reversal camera films (slide/transparency films). It applies to continuous‑tone pictorial films intended for viewing on transparency illuminators or by projection, and to 8 mm and 16 mm motion‑picture films used in non‑professional applications. This edition replaces ISO 2240:1994 and defines how to measure and report film speed so that exposure meters, camera automatic exposure systems and users can obtain predictable results.

Key topics and technical requirements

Scope: Colour reversal (positive) films for transparencies and non‑professional 8/16 mm motion‑picture films; not for professional motion‑picture films.

Sampling & storage: Test several batches; store samples per manufacturer recommendations to simulate normal user age before testing.

Environmental conditions: Equilibrate samples at (23 ± 2) °C and (50 ± 5) % RH during exposure and before processing.

Sensitometry & exposure:

Use a non‑intermittent, illuminance‑scale sensitometer.
Use illuminants conforming to ISO 7589 (daylight, tungsten, photoflood). Specify illuminant in instructions.
Exposure time for speed determination: 5 s to 1/1 000 s (reciprocity effects should be noted).
If filters are used in-camera, report an “equivalent” speed; ISO speed applies without filters.

Modulation requirements: Limits on spectral diffuse transmission modulation across 400–700 nm (and 360–400 nm allowances) to ensure uniformity of test exposures.

Processing:

Processing procedures are not prescribed - use manufacturer‑recommended processes.
Timing between exposure and processing: general‑purpose films 5–10 days, professional films 4 h–7 days.
Film speed is dependent on processing; processing conditions must be reported with quoted speed.

Densitometry:

Measure ISO standard visual diffuse transmission density per ISO 5‑2 (geometric) and ISO 5‑3 (spectral).
Readings in uniform image areas (≥1 mm from edges).

Evaluation & calculation:

Plot density vs. log10(H) to obtain a sensitometric curve.
Define point P at 0.20 above minimum density and point S at 2.00 above minimum density. The slope between P and S should be between −1.4 and −1.8.
Compute log Hm from H_P and H_S, average log Hm across batches, then convert to ISO speed using the standard scale (Table 1).
Accuracy: absolute error in log H must be

ISO 2240:2003

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Технические детали

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