test macro rail

Test of the macro rail on a table with a tiny object: "baby"greenfly on a rose button...length: 1 mm; width nearly 1 mm (including legs and antennas). The optical equipement is made of a zoom (set to 200 mm) coupled with a inverted 50 mm (See equipment adaptation). The magnifying power obtained is 4:1. The SIGMA SD10 case used for this purpose is equipped with a 20.7x13.8 sensor, composed with 9.2µm pixels. This value allows to determine the minimum opening avoiding the loss in definition by diffraction, as follows: 9.2*2=F/18. The depth of field will consequently be: ((confusion circle_digital_*2* opening mm. So the motor advance is set to the minimum, one step a picture, i.e. 0.125mm (see motorized focusing rail). After focusing on the sharp foreground, the system is run during 7 views, only 5 are stored. The scene is lightened by the auto 3 heads Cokin flash, which recycles well between every picture. "Baby" greenfly doesn’t move at all, which is very convenient. I haven’t been able to succeed positive tests with ants nor grasshoper babies..all of them are much too boisterous! The pictures fusion is realized with Zerene Stacker, available as a test version for linux...