making pin hole cameras
Open the back of the camera and find the spring 'C' ring that holds in the rear element. Using a small screwdriver, pry the ring out. Next, turn over the camera and let the lens element fall out.
Using a small jeweler's screwdriver, loosen the three screws at the front element. Pull off lower focusing Knob.
Remove the front lens element.
Inside we see another spring 'C' ring that holds in the middle element. Using a small screwdriver, pry the ring out. Turn over the camera and let the lens element fall out.
This is too easy.
Ring and middle lens element removed.
Roll the front element into a folded piece of paper towel. Using a bigger screwdriver, break the lens element without damaging the collar it is in. Carefully unfold and clean out any remaining glass from the collar. Fold up the towel, tape it shut and discard.
Make a mark on the inside of the pinhole mount in the event of losing track of sides. Place the collar on the mount so that the pinhole is in the center and trace a circle around the collar onto the pinhole mount.
Trim the pinhole mount using scissors (I used my Swiss Army Knife).
Carefully place the pinhole inside the lens barrel and gently push its edges down to the 'shelf' above where the 'C' ring sat. Take the front element lens collar and screw it down tight onto the pinhole mount.
Put the lower focusing knob back into place and tighten the 3 screws. Finished 75mm f/214 (half stop between 180 and 256).
Field test. Of course it works! Delta 100 in D-76 straight for 9 minutes.
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