Hourscalculator

Choose one of the five different calculators shown below. Note that there are separate calculators for fixed and rotating shifts with 8-hour or 10-hour shifts. Fixed shifts often require more personnel with 8 and 10-hour shifts, so they require different calculators. This is not the case with 12-hour shifts. In the boxes with the gold background, enter the coverage requirements for each shift on both weekdays and weekends. Coverage is defined as the number of people actually working, not the number assigned to a shift. The results will be shown to the right, in the boxes with the blue background.

The x-axis of an MTF chart is measured in millimetres and it represents the distance from the centre of the lens. 0 is the centre and for full frame 35mm sensors, the far side is 21.6mm.

MTF stands for Modulation Transfer Function and an MTF chart is a chart that plots the optical performance of a lens across the the image, from the centre to the corner.

Timecalculator

Absences The 5 staffing calculators DO NOT take absences (vacations, illness, training, etc.) into account. Many organizations rely on overtime to cover absences. However, if there is a high absence rate, this can lead to a number of problems, as described here. If there is more staff than the minimum necessary to achieve the desired coverage levels, you could either build extra coverage into the schedule or build relief coverage into the schedule. If you would like to learn more about how relief coverage works or how to take advantage of it, please contact us today. Imagine how much money you could save by reducing your headcount by just one person.

Work timecalculator

The schedules that average 40 hours a week always use five 8-hour shifts per week or four 10-hour shifts per week. The schedules that average 42-hours a week have one 48-hour week every 4 weeks (with 8-hour shifts) or one 50-hour week every 5 weeks (with 10-hour shifts). The first column in the Resources Required box is based on 40-hour work weeks and the second column is based on work weeks that average 42 hours.

Various lines on the chart depict the lens’ performance in both contrast and resolution, and it’s the combination of these two things that give us what we might call perceived sharpness. A lens only looks sharp when there is a good balance of both contrast AND resolution, even though most people don’t typically think so much about the contrast side of things.

Hourscalculatorweek

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If you'd like to see examples of different 24/7 schedules, we sell 5 different packages (see list below). You can read more here: Schedule Examples

The y-axis shows a lens’ performance in recreating a set of test charts that show repeating line patterns, called line pairs. Although the scale is in decimals, it’s actually referring to a percentage score of how well the lens was able to reproduce the image of these line pairs. At a minimum, two sets of line pairs are tested, one which is set to 10 lines/mm and one which is set to 30 lines/mm. The former test for contrast performance, while the latter tests resolution. Both results are plotted on the chart as different lines and some charts, like Canon’s, also show these results for the lens when it is wide open and also when it is at f/8 (the ‘sweet spot’). On top of this, the line pairs are tested in two orientations called sagittal and meridional, because a lens’ ability to reproduce fine detail and contrast does actually vary depending on the orientation relative to a diagonal line from the centre of the image to the corner.

PLEASE NOTE: MTF Charts are fairly complex so if you’ve some this far to read what it is, I’d urge you to continue to my in-depth article that explains how to read an MTF chart. This glossary entry here is intended only to give you a brief overview.

If you don't work 24/7 or you don't have steady coverage at all times, we can custom design schedules for you. Read more here:  Custom Schedule Design

For 12-hour shift schedules, the staffing requirements are based on an average work week of 42 hours. In most 12-hour schedules, half the work weeks are 36 hours (three 12-hour shifts) and half are 48 hours (four 12-hour shifts). This averages 42 hours/week.  For 8-hour and 10-hour shift schedules, most of the average work weeks are either 40 hours or 42 hours. You should look at both options to compare the staffing requirements. For example, 2-person coverage with 8-hour rotating shifts requires: