Rik, my 5mm estimate may have been more of a guess.....I was sitting here at home trying to remember the size of the specimens by holding my fingers apart. I actually wrote down how many frames in each stack. I will try and do a better job keeping track of these things in the future.
I also have shot rulers with my various optics. Since my scope has an ajustment on it that changes magnification those ruler shots only work for a few calibrated settings on the adjustment. Just this last week I added a finer scale on the adjustment so in theory, I will be able know what mag I shot a particular image at.
In practice it does not always work out that I get all the info about a shot in my notes. I often shoot a whole series of a single specimen at different magnifications, without changing the positioning of the specimen or the lighting setup and forget to make a note. I also get a lot of interruptions
that send my old brain off on a tangent.
All I can say is I will try and do better.
