John Caldwell Offline Upload & Sell: On
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Since only the center is in focus, make a representative small print of an in-focus area that, when translated to your 40" canvas, will be sized correctly. View that small print from your 5-8 foot distance. This will give you and idea how much detail will be reprinted in your full-size 40" canvas print. This is a general procedure to be followed when testing how a given print size will translate when stretching a file (or film exposure).
Start with your low-res file, and move up to a drum scan if it's truly warranted. Remember that the drum scan will only pull out additional detail if that detail is actually present in the transparency.
If you are seriously concerned about preserving sharp detail, canvas is an odd choice for your printing medium, in my mind. If detail is not what this is about, and the painterly quality of canvas suits your requirement, I doubt you'll need every last pixel for your print.
John Caldwell
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