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Introduction

Greater Spotted Woodpecker ©2012 Douglas Gregor ARPS, Click to see larger version.
Aperture: ƒ/8, lens: 300mm dof: 4cm
This is an 'app' developed for the android.   It provides the information that was once available on prime lenses, and a bit more.

It is for the photographer who would like to check depth of field at time of shooting and who would like to know the effect that small apertures will have on the sharpness of an image under different lighting conditions (the effect of diffraction, which is explained here).

For depth of field, the calculation is based on the sensor size, the aperture, the focal length of the lens and the distance from the subject, but with the option, for macro photographers, to use calculations based on the size of the subject on the sensor (as included on a macro lens as a ratio - eg 1:10).

Windswept Poppy ©2012 Douglas Gregor ARPS, Click to see larger version.
Aperture: ƒ/4, lens: 300mm, dof: 2½cm
When the size of the aperture combined with the size of the sensor might have an effect on the sharpness of an image in different light conditions, a drop-down box is displayed so that you may select a setting which corresponds with the light in which you are photgraphing. Depending on the light selected a colour-coded 'sharpness factor' is displayed to alert you to the increasing effects of diffraction as the aperture is stopped down (reduces).

 
When tele-convertors or macro lenses are used, the effective aperture is also displayed.

In the case of the macro lens this is based on the magnification factor when the image is between one-tenth life-size and twice life size on the sensor.
Snake\'s Head Fritillary ©2012 Douglas Gregor ARPS, Click to see larger version.
Aperture: ƒ/4, lens: 100mm, dof: 5½cm
For landscape photography the hyperfocal distance is calculated as is the distance which is acceptably sharp before and after the point of focus .

When tele-convertors or macro lenses are used, the effective aperture is also displayed.

In the case of the macro lens this is based on the magnification factor when the image is between one-tenth life-size and twice life size on the sensor.