Step 7Other configurations
You can also cover the outside of the cup with a black material to make it look more appealing.
If you'd like to allow some light through but would still like most of it to be directed elsewhere then you can keep some parts of the cup uncovered by the aluminum foil.
Using different sized cups yields different results so make sure to experiment with it.
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PS: In that last foto, isnt that Canon EF 50mm f1.8?? Ive just bought one in ebay right now :D Do you like it ?
And yes, that is the Canon EF 50mm f/1.8 II. It's a great lens that never leaves my camera bag. It's small, light, sharp, and fast. I used it exclusively for 6 months before I bought a wider lens. You won't be disappointed with it. And if you reverse mount it you'll have yourself a decent macro lens.
But with the difuser you invented i should increase the flash exposition or not?
When using flash without the diffuser, the light is going directly at your subject so you don't usually need high flash exposure compensation. But using the diffuser makes things a bit more dependent on your environment. Since this illuminates your subject by bouncing light off the ceiling and walls it would really depend on the colour of the walls & ceiling and the height of the ceiling.
If you're shooting a high or dark ceiling then you'll need more flash exposure compensation. If you're shooting with a light, low ceiling then the you won't need to increase the value by much, if at all.
The best way would be to experiment. There are many configurations for lighting so the best way to really learn which is best for a situation is to try it out.