"A MATTE BOX BASED ON TYPE A COKIN FILTER HOLDER"
A MATTE BOX BASED ON TYPE A COKIN FILTER HOLDER. Brian Lemin Introduction: I have always wanted a Matte Box especially for filter holding. I decided to try and make one for my Type A (small) Cokin Filter holder, which I kept from my still photography days. I have a useful collection of filters that I can use in it, not to mention my neutral density filters to see if I can achieve some depth of field with my HV20. Step one. You will need 5 mm matte black paper sandwich foam. It is light (and will not need rods to mount it on) it’s quite firm but can bow slightly, but not at the sizes we are using. The rest of the things you will need are measuring and cutting tools plus a sticky cloth tape which I used to construct the whole thing with. Ruler, double sided sticky tape, templates for “flags” I downloaded the templates from the net somewhere! I only used the large template for this box. Step 2. Mark around the Cokin filter and cut it out so that it fits firmly. Do not cut a chamfer into the foam. Keep it upright. . I had to have a second go to get it firm because I had the knife at an angle. i.e. like this “/” it should be like this “l”. Step 3. Cut out a strip of ½ inch foam sandwich and using double sided sticky tape construct 3 frame sides of a box around the filter holder. Stick the two vertical frame strips up against the filter holder sides. Double sided tape ready to peal. The 3 frame sides in place Step 4. Cut this off the full board in a “square” against the sides of the foam and squaring across the top where the 4th frame side should be. Step 5. Firm up all this with the cloth tape. Both inside and out as appropriate. Step 6. Cut out three of the flags from your template. Then proceed to hinge them using the cloth tape. Use the outside edges of the box and flags for the hinge. Leave the top, (i.e. where the filters are inserted) free for the moment. Flag cut out to template. Showing the flags hinged and ready to box up. Step 7. Make the “three” sided box now by using the cloth tape on both the outside and inside of the corners of the box. Note. I sanded the tape lightly to get rid of the gloss on the inside of the corners. Note the two pieces of white card you can see at the “top” of the box are for a later step. . The three sides boxed up. Step 8. Cut the 4th flag a little oversize for any fudging you might need to do for the final project. At the same time cut a piece of foam sandwich appropriate size for the top of the frame box. (You remember we only had 3 frame sides to the box? Now we are cutting the 4th side.) The 4th flag and the 4th side of the frame box will make the articulated hinge that will allow easier inserting of the filters. Over sized 4th flag. 1st stage of the articulated hinge construction. Step 9. Using the cloth tape make a hinge for the 4th frame side and the 4th flag. Then fix the 4th frame side in a hinging manner too. Close the flag on to the top of the matte box and trim sides to fit. Articulated hinge doubled back Front view of the articulted hinge closed and in place. Step 10. To stop stray light from entering the Matte box from a less than good fit of the 4th flag, I cut two pieces of card to protrude above the 4th flag and thus stop stray light. All white parts will be coloured black with acrylic black marker (Not permanent pen as it is acid and will disolve the foam) Step 11. Mount the Matte box on your camera, fold the articulated hinge back, insert your filters and close articulated hinge so that the protruding side cards act as a light guard. Articulated hinge back for inserting the filters. Matte box in hinge‐closed position ready to be used. (Excuse the pins, the glue had not dried when I wanted to take the pictures!) Conclusion. It works. The filters are easy to change and I have made the cosmetic changes as mentioned in the notes but are not apparent in the photos (i.e. making the white parts black and matting the glossy tape that is inside the box.) It is light and does not need rods for support (shame!! ☺ ) I am sure that I will find some other improvements as time goes along. Send me your improvements please. Brian. Thanks. email@example.com