A stereoscope is far from being perfect for photomacrography but taking into account some parameters can help:http://www.lenaturaliste.net/forum/view ... f=60&t=545 http://legeophile.free.fr/download/arti ... 071108.pdf
(in French but automatic translators, such as http://webtranslation.paralink.com/
, work well).
However, a macro objective directly fixed to a SLR camera gives incomparably sharper images. Common macro objectives reach a magnification of 1x at the sensor plane, life size, written 1:1. With a DX format sensor (15x25 mm) the frame is the same as seen in direct observation with, for example, a Wild MZ6 or Nikon SMZ2B stereoscope at 8X with 10x/21 oculars. With additional macro rings a magnification equivalent to the 16x of the stereoscope is easily reached for small money.