In response to the last guy who posted - sorry I had posted before I had a chance to read. This camera is designed to be used in conjunction with a lightmeter. Lightmeter reading > this camera > Proper camera. Similar to polaroid film it just allows you to check lighting, but because you can match ISO speeds to the film you're using in your proper camera, you can just transfer the setting across from this camera to the proper camera when the lighting is correct. I do currently use a 20d or polaroid for checking exposure, however, the 20d doesn't have the iso range required, nor does any other pro dslr. Besides, A bit of a waste just to check exposure, I fear. By proper cameras I mean medium/large format cameras, both of which outperform any digital camera on the market today when used in the correct manner. (my basis for comparison is the hassy H3D)
Hope this clears up questions and issues.