Wow. That is a good price on a 300G. But since this is going to be used with 8x10 film and is engineered for 20x magnification, that's a sixteen-foot wide print. I don't know what the low end of
the G is per recommended magnification ratio. Would be easy to find out, but is probably suitable for your use, much more so than any taking lens if that focal length. But you'll need some elbow room!