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I just followed Eddies lightbox design but with the bulbs in parallel (I had problems with them in series as in the design) and put a dimmer switch inline on the ac side of the transformer.
Yes I just invert the ota and put the box on the top. It is very light and a snug fit so it doesn't fall off. The diffuser screen I use is perspex that is used in the lighting industry for that particular purpose.
Here are a few piccies and associated data.
The first one is a shot of the finished box.
The next three are a shot just using a lense in a dark room with the box at full setting (very bright) with it's colour histogram and the raw camera data.
The next three are of a shot taken through my 8" with the 300D with a colour histogram from PS and the Raw image data.
The last is of the box sitting on the scope. Works just as well on the ED80.
It should be noted that I checked the consistancy of illumination using a light meter and there was less than 1% difference in reading anywhere over the box. Any gradient that may be seen in the image is an artifact or produced by the scope or lens or response from the camera
btw the box has now been fully taped around the edges. When I took the shot I thought I may have needed to still get into the box to make adjustments.
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