Lomograflok-Chamonix 45 Ground Glass Holder (adaptable)

thingiverse

Offset mask for the Lomography Lomograflok Instax Back with integrated ground glass holder attachment. The mask connects directly to the Graflok back, the camera viewscreen attached directly to it, both are removed as one unit when attaching the Lomograflok back for exposure. This reduces the risk of dropping the ground glass, speeds up the process and allows you to use viewscreen accessories such as integrated hoods or Reflex finders. I've divided the offset into an upper and an lower part, washers are inserted when screwing it down to calibrate the thickness - I get correct close-up focus at 21,8mm (compared of the 19,5mm mask that came with my Lomograflok back). The Attachment clamps are separate parts screwed to the upper frame, so you can easily print frames specific to your camera models ground glass holder. I've included clamps which should be compatible with all 4x5 Chamonix screens, with two options for the upper part to vary stiffness. You'll need 10 M3 threaded inserts (to connect the lower and upper frame, 4 to attach the clamps to the upper frame), screws and a variety of washers (I am using 6 times 4 washers between the frames - you may want to print hollow tubes of the right size instead, once you got the correct height). If you don't like the gar between the upper and lower frame I've included a light trap / frame to be glued to the underside of the upper frame - this is optional and should not affect usability if skipped. Update 2021-01-15: I've added an optional replacement for the upper frame so it can be inserted below the ground glass just as the stock version, forgoing attaching the ground glass to the mask itself but keeping the ability to tune the focus distance by adding spacers between the frames.