Hi Carmen! Thanks for the post. I checked out the site you linked to. If I'm correct, the article you mention regarding building a homemade $15 light box is actually authored by Cheryl Coccaro, while Rena Klingenberg is the site owner. I appreciate the work that Rena has put into her site and admire her ambition and personal outlook on life...I can see why her site inspires you.
Her site features guest articles much like the one I have written for BeadingDaily. The author of this particular guest article appears to use a clear plastic file box on it's side to filter light coming in from a window, rather than cardboard as you mention. This is a creative use for the filebox, and in theory, it should be a good diffuser, though I would suggest using a piece of translucent poster board to cover the back and bottom so you don't have the unattractive box-bottom mold seams showing in the photo's background.
I did see a few other guest articles on the site that covered light boxes, but not homemade ones, just ones for online purchase. You really only need a light box if you are working with very bright light coming from direct lamps or direct sun. If you are taking photos by a window, you should be fine without a diffuser as long as the sun isn't shining directly into the window. Nothing against light boxes, (I have one), and that may be the way to go if you have the budget, the time to learn how to use it, and need truly professional looking photos to market your work. They do open up a lot of options for creative shots, but there is a price tag on those options as well.
My article focuses on making improvements using the most basic of equipment...your camera, a tripod and the natural light of the sun. However, I will be happy to answer questions for anyone trying the lightbox route as well since I have used both techniques in taking photos, depending on the specific needs for each photograph.
BTW...I did figure out how to start my own thread, so feel free to check it out after my article posts. It's also under General Beading Discussions/Beading Business.
Kirsten Creighton, author of 3 Simple Steps to Better Beadwork Photos
www.beadambition.com
www.tatnuckbead.com