From what I can see the Howtek is much better. The Epson as well as the Howtek has native optical resolutions as well as non-optical (interpolated) resolutions. Could be the 4800 is an interpolated resolution. Did you wet mount and use something like the Betterscanning wet mount to adjust the focus?
I like the idea of not having to sharpen my images which the Howtek seems to produce scans that do not need to be sharpened which is ideal and shows the quality of ones image at capture. At least as far as focus.
Also, there isn’t a native aperture for a given dpi setting. It is highly dependent on the film as well as the dpi chosen. There is what can be described as an optimal setting that can be determined by the software such as DPL can do. I use that as my starting point make some test scans with and around the “optimal” aperture chosen. It is not always what the software may chose or some guideline.
Not bagging on your comparisons, they are quiet good and informative.
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