Nothing on TV last night so I decided to play around with focus stacking using Affinity Photo . Tried stacking before using Photoshop/Lightroom and the trial of Helicon Focus . Didn’t have too much experience with Helicon as the trial ran out on me before I could play with it enough to really find out its’ capabilities . Seemed OK though . I find PS/LR for stacking to be somewhat of a pain so I was looking for an alternative .
Anyway , the shot below is of some Copper Sulfate powder . The consistancy of the powder is similar to fairly fine sand . Total area of the grains in the picture is around 6 mm x 4 mm . Was kind of disappointed that the grains weren’t nice regular crystals , but it’s agricultural grade , not USP . I used a piece of smooth black vinyl as a base . At least it looked smooth to my eye .
The image is comprised of a stack of 40 individual shots , taken with a 7D2 and Canon 65mm MP-e lens mounted on a slightly modified Manfrotto focusing rail atop a tripod .Magnification was around 3X . Each image taken at f8 @1.6sec. , ISO 800 , using live view for the initial focus , and a remote release . Room lighting .
The MP-e is a strange beast in that there’s no facility on the lens to focus your image , only to adjust the magnification . You need to move the whole lens/camera . At magnifications much over 2X the DOF is so small that the set of rails is necessary to achieve any kind of consistent focus , as is Live View or tethering to a computer and focusing using EOS Utility . Focusing by hand at between 1X and 2X depends purely on luck . At least for me.
In order to more accurately control the focusing rails , I milled 4 equally spaced indices on one of the feed knobs . This enables me to pretty accurately advance the carriage in ¼ turn increments . The lead screw on the rail has a 1mm pitch , so ¼ turn equals .25mm or .010” +/- . Depth of field at 3X f8 is almost exactly .25mm (actually .249) so the in focus area in each shot in the series should come in .25mm after its predecessor .
All the stackable images were shot as large quality jpegs. Made it much easier to import into Affinity .
Here ya go…….
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