Applications, Base, Total Film Thickness | Kodak AS-2569 instruction

AS-2569

KODAK AEROCHROME III MS Film 2427

KODAK AEROCHROME III MS Film 2427 is a very fine-grain, medium-speed color-reversal aerial camera film. This film has excellent color rendition and good image quality.

It has an ESTAR Base with a clear gel backing. The ESTAR Base has good optical qualities and provides flexibility, moisture resistance, high tear resistance, and excellent dimensional stability.

This film can be processed in Process AR-5 using KODAK EA-5 Chemicals in modern, continuous-processing machines such as the KODAK Aerial Color Processor, Model 1611 or the KODAK EKTACHROME RT Processor, Model 1811. It can also be processed in rewind equipment such as the Gordon/Morse rewind equipment.

APPLICATIONS

KODAK AEROCHROME III MS Film 2427 is intended for low- to medium-altitude mapping and reconnaissance applications. It provides positive color transparencies suitable for projection, direct viewing, or making color prints.

BASE

3.9-mil(0.10 mm) ESTAR Base with a clear gel backing.

TOTAL FILM THICKNESS

The nominal total thickness (unprocessed) of this film is

5.44mils (0.14 mm). This includes emulsion—1.04 mil (0.03 mm), base—3.9 mils (0.10 mm), and backing—

0.50mil (0.013 mm).

WEIGHT

The weight of AEROCHROME III MS Film 2427 (unprocessed), conditioned in equilibrium with 50 percent relative humidity, is 0.038 lbs/sq ft (0.0172 kg/sq ft).

SPECTRAL SENSITIVITY

This multilayer, color-reversal film is balanced for daylight exposure.

SAFELIGHT

Total darkness is required.

EXPOSURE

Aerial Film Speeds (EAFS or ISO A equivalent) should not be confused with conventional film speeds, which are designed for roll and sheet films used in pictorial photography. The characteristics of aerial scenes differ markedly from those of ordinary pictorial or ground scenes because of the smaller range in subject luminance, atmospheric haze conditions, and other factors. Therefore, different film-speed characteristics are used to relate aerial-scene characteristics to practical exposure recommendations.

The KODAK Aerial Exposure Computer, KODAK Publication AS-10, has been published based on the aerial film speed criterion.

Nominal speed, daylight (no filter): EAFS or ISO A 32 (based on development in KODAK EA-5 Chemicals)

Note: The Aerial Film Speed given in this publication is rounded to the nearest cube root of 2 step (equivalent to 1⁄3 stop).

Filters

No color-correction filters are used with this film, although a haze filter, such as a KODAK WRATTEN Filter HF-3 or No. 2B may be necessary for reducing the effects of atmospheric haze.

Typical Camera Exposure

A typical exposure for this film is approximately 1⁄500 second at f⁄4.7. This exposure is based on a solar altitude of 40 degrees, a clear day, and an aircraft altitude of 5000 feet.

When using an aerial camera equipped with an antivignetting filter, or other filter, it is important to increase this typical exposure by the filter factor of the filter used.

IMAGE STRUCTURE

The following data are based on processing in KODAK EA-5 Chemicals, Process AR-5.

Resolving Power (line pairs/mm)		rms Granularity*

TOC 1.6:1	TOC 1000:1
TOC 1.6:1	TOC 1000:1

80	100	13

*Granularity values read at a net green diffuse density of 1.0 with a 48-micrometre aperture.