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Source page: http://commons.wikimedia.org/wiki/File:RulerEdge.jpg
Description English: Non-cropped (but JPEG-downscaled) macro photo of an edge of a plastic ruler with millimeter scale, created with a macro lens Tamron SP AF 90 mm F/2.8 Di MACRO 1:1 and a wide angle lens smc Pentax-M 28 mm F/2.8 mounted in "reverse position". This combination (see photo links below) allows a magnification of 3.2:1 – but only with a tiny depth of field at a working distance of approx 4 cm. The shading of the corners is probably due to the fact that the reversed lens had a smaller filter diameter (49 mm) than the camera-mounted lens (55 mm). With an aperture of f3.5 in the macro and f22 in the reversed lens, the vignetting was the lowest (and the depth of field was the best; as shown here). Deutsch: Unbeschnittenes (nicht "gecropptes") Makrofoto der Kante eines Plastiklineals mit Millimetereinteilung, erstellt mit einem Makroobjektiv Tamron SP AF 90 mm F/2,8 Di MACRO 1:1 sowie einem Weitwinkelobjektiv smc Pentax-M 28 mm / 1:2,8 in "Retrostellung". Diese Kombination (siehe auch Fotolinks unten) ermöglicht zwar einen Abbildungsmaßstab von ca. 3,2:1, allerdings bei einer winzigen Schärfeebene in einem Arbeitsabstand von lediglich ca. 4 cm. Die Abschattung der Bildecken kommt wohl dadurch zustande, dass das Retroobjektiv einen kleineren Filterdurchmesser hatte (49 mm) als das kameraseitige Objektiv (55 mm). Bei einer Blende von f3,5 des Makros und f22 des Retroobjektivs war diese Vignettierung am geringsten (und die Schärfentiefe am größten; wie hier gezeigt).
Date 30 September 2010(2010-09-30)
Source Own work.
Author Christian Fischer
Other versions

Equipment: MacroPlusRetrolens2.jpg MacroPlusRetrolens.jpg Other trials: MatchStickHead.jpg BallPenTip.jpg PencilTip.jpg

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Attribution: Christian Fischer
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EXIF data:
File name ruleredge.jpg
Size, Mbytes 1.82213378906
Mime type image/jpeg
Camera manufacturer PENTAX
Camera model PENTAX K-7
Orientation of image 1
Image resolution in width direction 300
Image resolution in height direction 300
Unit of X and Y resolution 2
Exposure time 13/10 sec (1.3)
F number f / 3.5
Exposure program 3
ISO speed rating 100
Exif version 0221
Lens focal length 90 mm
Date and time original image was generated 2010:09:30 22:55:02
Date and time image was made digital data 2010:09:30 22:55:02
Meaning of each component 
Exposure bias 0
Metering mode 5
Supported Flashpix version 0100
Color space information 1
Exif image width 4672
Exif image length 3104
InteroperabilityOffset 54456
Sensing method 2
Scene type 
Focal length in 35 mm film 135 mm
Contrast 2
Sharpness 2
Subject distance range 1
Interoperability index R98
Interoperability version 0100
Software used K-7 Ver 1.10
Copyright holder See added licence
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