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Paper
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Select the paper from the list-box. More papers will be added in the future.
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Reading Ap.
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Select the lens aperture you use when reading the EV200 values with your light meter. You can use full aperture during this stage, allowing a more accurate estimate of the negative.
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| H head | Input the distance in centimetres between the lens and the paper. |
| Grade [result box] | Paper gradation (from 0 to 5). This is one of the results of the optimisation. |
| Time [result box] | Printing time in seconds. This is one of the results of the optimisation. |
| Printing Ap. [result box] | Lens aperture you will use for printing. This is one of the results of the optimisation. You can force a different aperture as described in the following. |
| Error [result box] | Sum of the squares of the differences between desired and obtainable grey levels. This is one of the results of the optimisation. |
| Printing Ap. | Lens aperture you will use for printing. If not selected, the program will suggest the lens aperture in the result box. |
| 0 1 2 3 4 5 | You can deactivate one or more paper grades selecting N. |
| Ecc. | Eccentricity in centimetres of the point where you are pointing the light meter. This is the distance between the point and the axis of the lens. |
| EV200 | Select 200 ASA as the film speed scale. Take a reading of the negative area in which you want to obtain a specific grey level, then select this value from the list-box. 1/4 EV increments are considered. Negative values should be avoided, because they fall outside the declared sensitivity of most instruments. For this reason, you can take the measurements at full lens aperture. In any case, a correction parameter can be input, as described in the following. |
| Zone IN | This is the grey level you desire in correspondence of this point. The numbers correspond to that of the commonly adopted Zone System. If you do not specify any value in this field, the corresponding EV200 will not be used by the program for the optimisation. |
| Zone OUT | This is the grey level that can be actually obtained. The program perform an optimisation, in order to approximate all Zone IN values you specify. If an EV200 value is specified and the corresponding Zone IN value is not specified, the program only calculates the grey level you will obtain in correspondence to that EV200 value. This option is useful if you do not want to force a specific area in the optimisation, but you only want to check the grey level you will obtain. In some cases, especially for very low or very high EV200 values, you could decide to perform dodging or burning, because you can’t achieve the desired grey levels for all areas. Let’s discuss the burning case, firstly. To this aim, deselect the Zone IN value corresponding to the smallest EV200 value and calculate Grade, Time and Aperture. Let’s call base time the time so calculated. Then, deselect all Zone IN values,
except that corresponding to the smallest EV200 value, for which you could select 8.5, or a different value,. Be careful to check wether the Grade was not changed. In this case, force the solution using the 0 1 2 3 4 5 switches, as previously described. Now you have obtained a new time, greater than the base time. The difference between new and base time is the burning time. A similar procedure can be used to calculate the dodging time. |
| Lightmeter | Select the lightmeter used for the measurements. |
| Enlarger | This is a text field, in which you can input the model of the enlarger. |
| Lens | This is a text field, in which you can input the model of the lens. |
| Film/Shot | These are two text fields, in which you can input film and shot references. |
| Date/Time | Automatic field. |
| e-mail | E-mail address that will receive a report of the calculations. |
| Reset | Button to delete most fields, except some fields that usually you will not change during a print session. |
| Send e-mail | Button to send a report to the e-mail address previously specified. The word SENT! appeaars after the e-mail address if the mail was sent, otherwise the word ERR! signals that some problems occurred. |
| In the dark room |
Instructions for iPhone To avoid damage
to the paper, due to the light of the iPhone screen, go to
Settings - Accessibility - Display & Text Size - Colour Filters and switch on.
Then select Colour Tint, slide Intensity fully to the right and Hue
fully to the left. To easily select this setting, go to
Settings - Accessibility - Accessibility Shortcut and select Colour Filters.
Instructions for Android Go to Settings - Accessibility - Visibility enhancements - Colour lens and switch on.
Then fully slide Opacity to the right and select Red. If maximum opacity is
less than 100% reduce the screen light.
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