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To create an image of your invention prototype or model, you can use either a digital or a film camera. What it really comes down to is personal preference and what you can afford.
A digital image may be more convenient because digital images can more easily be uploaded to the computer and sent via email. Printed film photos take an extra step to upload. Either scan the photo into a computer or request a high-resolution photo CD when you drop off your film.
If you're using film, use 400-speed negative film. It's the most flexible consumer-level film and works best in a variety of lighting conditions. If you're using a digital camera, set it at its highest resolution for the best quality image.