Plustek 8200i Film Scanner Optical resolution question

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Paul-H

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Hi all

A quick question, I hope

I have a plustek 8200i Film scanner which the makers claim has a resolution of 7200dpi, but when I use the Supplied Silverfast software that claims the maximum resolution is 3600dpi with a recommended resolution of 2400dpi.

Anyone know what the true optical resolution of this scanner is.

Are Plustek pulling the old Interpolated ruse

Thanks

Paul
 
Basically @Paul-H, it's nothing to do with interpolation. Although the sensor itself is perfectly capable of resolving 7200 dpi, the problem is that the specification is at the sensor itself, and other optics in the scanning pathway (especially the high pass filter) reduce the actual resolved resolution. What this effectively means is that (in the case of the Plustek) scans at 7200 dpi come out massively bloated, but with no more detail resolved than scanning at 3200 dpi! It's not really marketing entirely as it is true that the sensor resolves what it states (at the sensor), and I doubt that they actually bother to go any further in testing the actual performance by scanning USAF 1951 resolution test targets etc.

But then certain scanners (like the Plustek 8200i and nearly all other Plustek's) also have another "problem" with this...

srichards said:
http://www.filmscanner.info/en/PlustekOpticFilm8200i.html

3000 ish dpi I think. I read that site before deciding on any scanner.
Click to expand...

... being that in order to get that about 3200 dpi resolution, you actually have to scan at the maximal 7200 dpi resolution, with scans at 3200 dpi actually resolving even less (around about 2500 dpi)! This means that in order to get the maximal resolved resolution the scans take ages and are massively bloated with needless information which resolves no more detail than at 3200 (it would be best to simply scan at the maximal and down-res afterwards)! Some scanners appear to need to be used at the top resolution to get the maximal, and for unknown reasons others don't - part of the reason why I selected a Reflecta ProScan 7200 as on the maximal 3600 dpi setting it resolves about 3250 dpi.

I don't know why Silverfast would only show 3600 dpi as the maximal, when it is definitely 7200.

Sam.
 
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