A Gel is basically a colored piece of plastic used to alter the color of a lightsource. Gels are commonly used for creative effect or to balance flash with different color lightsources. there are many different ways to attach gels to your flash such as clear gel holders, hard snap on gels, sticky gels and of course attaching a piece of gel with a bit of gaffer tape. however All these options can make it difficult or impossible to "stack" gels or attach light modifiers such as softboxes or bounce cards etc. After some thought and experimentation I came up with a great cheap diy solution that i could not find in stores.
What you need
a sheet of 24x24' Rosco gel costs about 6 bucks in B&H, one sheet should be enough to last a lifetime.
Cutting the Gel
1) using a sharp scissors cut a rectangle of gel thats about 2" inches by 3" inches.
2) place the piece of gel on the flash head, line up the end with the bounce card/pull out diffuser board slot. and cut away the edges on the right and left sides. line up the end of the gel with the end of the flash and make a fold with the overlapping bottom part.
bend down the flap that sticks out like shown below. this will fit into the diffusion panel slot.
3) turn the gel around so that the fold can slide into the diffusion panel/bounce card slot, you will probably have to cut off small parts of the flap on the sides so it can fit.
4) pull out the diffusion panel a bit and insert the gel flap into the slot, then push the diffusion panel back down.
5) and your done! the gel will now stay in place. i generally keep a gel rubber banded to the side of all of my speedlights so when I need a gel I simply slip out the gel and slide it into place on the flash head.
Im still on the lookout for some kind of small case that could neatly store many gels, if you know of such a thing let me know!
next I will show a BTS (Behind The Scenes) on how the cover photo was shot, also coming up, "Using gels to balance flash with ambient"