Bedienungsanleitung Gossen DIGISKY (Seite 31 von 39) (Englisch)

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GOSSEN Foto- und Lichtmesstechnik GmbH 31

9 Practical Notes

Programming DIGISKY to compensate for external influences affecting exposure

The DIGISKY provides you with precise exposure data in accordance with DIN 19010.

In the unlikely event that you are not satisfied with your results, it is possible that one or

more external factors may have adversely influenced the final exposure. Some possible

factors are:

 The “Actual” film speed may differ.

 Your camera’s “actual” shutter speeds may deviate somewhat from the nominal

values.

 Your camera’s “actual” f-stops may differ from those specified.

 Deviations may occur while developing negatives and prints.

Any or all of these factors may be further compounded by subjective factors and

personal taste when evaluating finished pictures.

Fortunately, you can adapt the DIGISKY to your camera’s individual characteristics,

your workflow and your own subjective evaluation criteria.

We recommend the following method - Carefully measure several standard objects

(grey card, grey scale and colour charts are perfect for this purpose) in reflected light

and incident light modes, and complete a series of exposures. Use the value given by

your DIGISKY. The first image is made with the exposure value displayed by the

DIGISKY. Then, this exposure value is increased or reduced by up to one f-stop,

dependant on the increments/“stops” of the lens. Lighting conditions must remain

unchanged during this test series. From all developed or printed photos, select the

image which is the best one in your opinion and compare its settings with the

measurements. If the image has a different value (i.e. +/- one f-stop, etc.) compared to

the original meter reading, you can set the corresponding value into your DIGISKY with

the help of the Correction Value Mode (see page 26).

Contrast and Best Exposure

Basic rules for the best possible exposure dictate that the brightest and darkest parts of

the image should have adequate detail. Yet, individual opinion and personal

creativeness may, of course, render these rules null and void. Thus only general

recommendations regarding the subject of ideal exposure can be provided.

It is important to consider the fact that the final product (photo, print etc.) is only capable

of processing a small contrast range compared to the human eye. By means of the

DIGISKY, you can measure the lighting contrast in the incident light measurement

mode, as well as the subject contrast in the reflected light measurement mode. In both

cases, the contrast is shown in the analog display. In general, you do not get the correct

exposure for your subject by measuring the brightest and the darkest points. This

should be either a medium grey within the subject, or the average value of the

measurement results for the brightest and darkest points. The average value is

calculated automatically by the DIGISKY. If you find that the subject contrast range is

bigger than your workflow is capable of processing, you can brighten up shadows, for

example, by using a reflector or a employing a fill-in flash, consequently reducing the

subject contrast.

When subject contrast is taken into consideration by means of generating an average

value, the following general rules apply:

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