Metric Scale

Metric Scale

I had a scale from my days in the machine shop which was imperial.  The folks at mindat.org didn't like to make the conversion.  I decided that I might as well purchase a metric scale since camera and lens sizes are metric.  It would simplify everything.  I purchased one that was graduated in 1/2 mm increments.  

In order to provide the viewer field size and magnification on the sensor data I found that I must photograph the scale each time I made a capture.  OR, I could set my macro/micro lens to its shortest focus, adjust the focus with the focusing rail.  I record FOV captures for each setup and record it so that if I start with certain setup I know what the FOV and magnification as long as I start with Sigma 105mm set at its closest focus.  I've also found that recording the WD, working distance, aids my set up, composition, etc., making it quicker and easier.  Again, I do this with the micro lens set on closest setting.  I am planning to share the above data soon.

One other "trick" I have learned I may have mentioned before.  I can shine my flashlight into the viewfinder and it travels backward through the camera showing where it is aimed.

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