0.1mm converts to about 0.004 inch which is HUGE for a lens barrel. Tolerances for lens cell barrels and shutters are typically 0.001 inch range. These numbers are not appreciated unless one does machine work, engineering-technical calculations and similar. For the hobbyist and those with no real world experience doing stuff like this these numbers and their physical dimensions are difficult to relate to or appreciate.

"Oh, I've ripped apart a Philippe Patek watch, put it all back together but for some reasons it is no longer time accurate, it does work, so good enough for me.

As for easy for any "good" machine shop to make shims. Shims less than 0.01 inch thick or 0.254mm are not going to be made on a lathe or similar machine tool process due to the limits of shearing material from bar stock. Parts like this will be made by etched metal process where a mask is applied to a sheet of metal specified fo the part, then etched until the part is cleared. They can also be made by laser cutting or similar. These are not common machine shop machines.

LF has become more of a Foto hobbyist or speciality artist endeavor today due what has happened to the image production universe. There are not similarities to the custom car world or similar and the LF camera world. Not a bad thing if this keeps LF image making alive and well. What can and does happen, the difference between technical excellence and individual projections of what they believe is excellent can become accepted as a standard of excellence disconnected from true technical excellence based on Science, Engineering, and the way Nature is.


Bernice