Tips For Buying Used Camera Gear #photography #camera https://digital-photography-school.com/tips-buying-used-camera-gear/
How To Calibrate Your Lenses | A Simple Fix For Blurry Images http://www.slrlounge.com/calibrate-lenses-simple-fix-blurry-images/
Take Double Exposures With a 35mm Film SLR (How To) - YouTube
I definitively will not try to eat it.
I find this interesting to have a closer look to little stuff you usually never notice.