I was asked by another member how to make this flash gel holder, so I typed up these quick instructions which I hope make sense.
See picture below for a visual....I can clarify if needed.
DIY Instructions to make a flash gel holder
Heavy cardboard (similar to the notepad backing thickness)
Cardstock (i.e. Georgia-Pacific brand, 110 lb, 150 sheets in a pack)
Black sharpie if you want to color final holder black (paint would work too)
1. Measure the flash head; outer edge to outer edge. For example, my 420EX is 2 ½” x 1 3/8”.
2. Measure the flash gels; the Apollo brand gels are 3 ¼” x 1 1/8” (they are larger than the flash head).
3. On the heavy cardstock, measure out two rectangles LARGER than the flash gel measurements. I used the measurements of 3 3/8” x 2”. This will be the front and back plate area that holds the gels. Put them to the side.
Hint: use the corners so that you already have at least one straight edge cut.
4. Next, with the thinner cardstock, measure out the dimensions of the flash head running the length of the cardstock, this will be the flash head sleeve. At each interval, make a mark for the fold lines. So start from one edge of the cardstock and measure in the long side of the flash head, 2 ½”. Make a mark for the fold line and then measure 1 3/8” for the short side of the flash head and make another mark. Repeat again, long side then short side. Finally, measure about ½” to ¾” extra to use as a glue flap. When cut out, it will make a box using the glue flap. Now the width, the portion that will slide onto the flash head, has to be long enough to hold the flash holder on the flash head. I made mine 1 7/8” wide.
5. Fold up the cardstock at the fold lines made above and glue the flap to make a box. While this is drying, you have to cut out an opening into the gel panels. I made my opening 2 ½” x 1 3/8” (same measurements as flash head) so that it would hold the gel in place, but let enough flash through. This is where the hobby knife is used since you need the flash gel plates to be in once piece. Put the rectangles cut out to the side to be used for strips.
6. Take the rectangles from the previous step and measure about 1/8” from the edge (this was my measurement used for my flash head). What the strips are for is to sandwich between the two gel plates where the gel will slide into; much like the paper sleeve that your bank card comes with. You will make a U shape on one of the plates. It helps to have one of the gels handy to test fit so that you are sure not to make it too snug which would not allow the gel to slide in without forcing it.
7. Once the U shape is completed, line up the 2nd plate and glue it into place that way you have a slot on one end between the two where the gels slide into. I cut a semi-circle on that end so that it is easy to grab the gels from the slot.
8. When all the glue is dried, it is time to attach the plates to the flash head sleeve box. On one side, cut a small slit in each corner of the box. Once the slits are cut, fold up the edges which will make the surfaces to glue to the plates; little flaps at the edge. Line up the flash head sleeve and the hole for the gel plates and glue the two pieces together.
9. Once dry, you have your completed flash gel holder. All that is left is coloring it black if you want with a sharpie, paint or crayons.
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