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For mineral specimen photography a table top setup with a glass plate can be used in two principal ways: 1.
With a camera in vertical view mounted on a repro stand. The specimen
is mounted above the glass plate so the level of the glass plate is
never in focus if the aperture is set to maximal sparpness at
f=8. Small depth of focus is overcome by (general) using of
remote control software and automated stacking by focus control of the
camera lens. Due to a black sheet under the glass a perfect black
background is the result, small dust particels do not disturb as not in
focus. The
setup can handle specimen sizes of filed of views from 2 to about 25
cm. For larger specimens a (additional) curved table top or a upscaled
glass plate is essential.The back background can reasy replaced by other backgrounds. Coloured spots allow colour accents (spots). A white background is possible with a white or semitransparent arcryl glass sheet on the glass in conjunction with a balanced backlight. Also here the specimen is mounted above the background level, to avoid troble from debris. 2. With the camera mounted in inclined view on a tripod or another stand the glass plate over black and with a black backshield produces a fine black background, which can combined with colour spots or coloured backgroun from below the glass plate. Background light must be in balance to specimen lightning. A white background is possible with a white or semitransparent arcryl glass sheet on the glass in conjunction with a balanced backlight typically unter a light tent or diffusor tunnel. Minor reflections of the specimen on glass plate, dust and debris can be removed by simple retouching. |
still under construction |