Decide on your final size for the sofbox. It should
be as large as possible, without blocking the lens.
Some flash guns have sensors on the front to measure
automatic flash, you will have to be creative to
avoid blocking those. Here is a really old one
with a shape for the Canon 430 ez flash gun. This
worked really well but was an early model and didn't
look very good. For my latest softbox the final
size was 200mm x 385mm, designed for a Canon 10D
with 28-105 lens.
Old Style softbox for sensor on flash gun
the sides of your flash head, add up all the
sides, and cut a strip of mounting card about
20mm wide and however long you measured. This
will be the fiction fit hole to fit over the
flash gun head. Cut another piece of card 20mm
wide by the length of the longest side. Mark
and score the long strip then fold so it fits
around your flash head then glue the other card
on the join. Make sure the join is half way along
one of the longest sides. Take the mount off
the flash and clip then leave to dry. For the
Canon 430 ez this was a strip 220mm x 20mm, and
one piece 70mm x 20mm.
friction fit mount
out on the card all the main sides to the softbox,
use the mount you just glued and the final size
of the softbox to determine the angles etc. Mine
was achieved by drawing a rectangle 140mm (the
depth of the softbox) x 385mm, then use the mount
in the center of the longest side and extend
lines from the edges of the mount to the corners.
Repeat for all sides. This produces the sides
of the softbox. Don't forget here to add 10mm
tabs on the ends this makes it easier to glue
the diffuser and attach the flash mount.
ensure you have even lighting over such a large
area, you will need to put a second diffuser
halfway inside the softbox, just mark and score
some card, fold to make right angles brackets
and glue on the sides you made in Step 3. So
when all glued into the softbox shape this provides
a small ledge to glue and sheet of diffusing
is where you find out if all you angles are correct.
Glue all the sides together onto the flash mount
you made earlier, one at a time letting them
dry as you go. Makes sure you have the white
side of the card inside the softbox. Use the
packaging take along the seams to give stability.
Then cut a small rectangle of the diffusing film
and glue inside the softbox on the ledge. Then
cut the final large rectangle of diffusing film
and glue to the outside of the softbox. Let it
all dry before trying (I know its tempting to
use but try to resist).
is a lot easier to make than explain so don't
let it put you off, the results are really great.
So why not have a go. See the results below.
you have any question do not hesitate to contact
me click here.