I'm using an A40, and as many may know, the use of flash with the lens adapter on will result in a darker corner at the lower right hand side of the photo.
Inspired by this thread, I decided to make something similar. I went around shopping and found this:
This costs $3 at Popular bookstore. Out of the box:
I decided to use aluminum foil and some plastic to make a "reflector". Plastic came from this disposable lunch box: