File:BallPenTip.jpg
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English: Non-cropped (but JPEG-downscaled) close-up photo of a rollerball pen tip (line width 0,3 mm), 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 Spitze eines Rollerballschreibers (Linienstärke 0,3 mm), 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 | |
| Source | Own work. |
| Author | Christian Fischer |
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| current | 21:53, 30 September 2010 | | 4,672 × 3,104 (1.54 MB) | Fice (talk | contribs) | {{Information| |Description= '''''English:''''' Non-cropped macro photo of a ball pen tip, 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 |
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