35 mm Slide Viewer, customizable

35 mm Slide Viewer, customizable

thingiverse

Many of us keep a large number of 35 mm film slides from years gone by. We had some simple and affordable gadgets to view the slides without a projector. Today, however, it's challenging to find one. Online, you can discover slide viewers that are far more complex, heavy, and expensive. For this reason, I designed my own slide viewer and built it using a small lens from my collection of spare parts. It is likely that you can obtain a different lens and for this reason my design is highly customizable. You can use a lens salvaged from a small magnifying glass or a loupe or an optical device that has been modified (mine came from a cheap Ramsden eyepiece that belonged to a small telescope). The lens should have a focal length between 45 and 65 mm. The focal length is the distance between the lens and an object in order to see it clearly focused. As for the diameter, anything from 10 to 38 mm can be used. The viewer consists of three pieces: a body, the back piece, and the lens holder or focuser. The back piece remains the same. There are two focusers, one with a diameter of 25 mm, for lenses from 10 to 23 mm and another with a 40 mm diameter to be used with lenses from 24 mm to 38mm. In the focuser openscad file you have to put in the appropriate diameter. Find the focuser position to see a slide clearly defined before gluing it to the body piece. For the body, choose one that matches your lens focal length and the focuser diameter. The diffuser can be made with a piece of very smooth translucent plastic. Rigid plastics will be difficult to insert into the back piece. A simple solution is to cut a piece of plastic from the side of a juice bottle, but it's not smooth enough and you have to add a piece of tracing paper glued to the plastic on the interior face. Don't use cyanoacrylate (super glue) to bond the pieces together, as its vapors may fog your lens (plastic or glass). If you use silicone adhesive, it will be relatively easy to disassemble the viewer for maintenance. Of course, you can also use epoxy, but it will be very difficult to take the viewer apart. Have fun with the viewer!

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