True, indeed. Half of my life I spent to be the field cameraman. There was no service handily, so, if one wants to finish the project successfully, he/she must have advanced precise optical/mechanics skills, to fix everything what belongs to your professional duties. So, spring from the pen could be used to fix an old Leicaflex in Himalaya mountains, and screws taken from Russia-made tank's watch were used to fix stacked 80-200 AF Nikkor. Separate novel could be written about fixing the filming cameras... So on and on. Yeah, my experience on the field is somewhat unique. THX! LZ