i've also been testing a plastek 8300. since that one requires manual advancement of the image holder, it requires the most user intervention. for virtually every negative, i would have to adjust the frame limits in the silverfast software. it's also scans fast enough that you need to stay nearby.
initially, i was convinced the ISRD cleaning on the 8300 wasn't working. during the troubleshooting process, we determined that the IR defect scan was not aligned with the RBG scan, so the removal algorithms didn't work properly. both silverfish and vuescan are now aware and have solutions.
(silverfast requires going into the ISRD expert settings and manually tweaking the XY offset, while vuescan was updated to find the correctly align the IR defect scan with the RGB scan).
the ISRD on the 8300 seems much more sensitive to dust and scratches than the PIE PowerFilm. i scanned a couple of scratched negatives back to back and output of the 8300 was showing scratches and dust that were totally corrected on the PowerFilm.
all units were tested at maximum optical resolution to produce 48 bit TIFFs for maximum post processing flexibility.
the powerslide ==> 5000 dpi, powerfilm & 8300AI==> 3600 dpi
an update: scanning and testing continues
today i received a PIE Primefilm XEs. quite similar to the PlusTek 8300AI in operation using either a six position negative holder or a four slide holder.
from other reviews, the XEs can resolve upwards of 4200 dpi when used in 5000 dpi mode while the 8300AI (which supposedly uses 8200 optics with faster processing) resolves < 3300 dpi in the 3600 dpi mode.
i tested both using silverfast 9 AI. silverfast AI is included with the 8300AI while the XEs ships with silverfast 8.8 SE. i upgraded that one to silverfast 9 AI for under 100$ so that i could do back to back testing with exactly the same software.
observations:
1) the 8300AI is significantly faster and quieter when doing a scan.
to do scratch an dust removal, the 8300AI requires a second pass to generate an IR detection mask. (this approach as currently implemented has issues)
2) the XEs is definitely louder, but combines the RGB and IR in the same scanning pass.
given the first observation, one would think that the 8300AI would be my first choice for scanning negatives and transparency, but the two passes required for scratch/dust removal causes problems.
i was quite surprised when i reran a group of 35 negative through the 8300AI which had been scanned using the PIE Powerfilm. More than half displayed uncorrected dust and scratches.
Upon further investigation using the MARK mode of the silverfast iSRD, it became evident that the IR dust/scratch mask was offset from the RGB scanned image and causing the automatic scratch removal to fail. The amount varies from scan to scan.
the current offered solution from silverfast and plustek is to run the iSRD in manual mode, and view in MASK mode, then manually offset the IR mask to match the RBG image. currently, i've seen adjustments up to +/- 40 ticks in the vertical and +/- 10 ticks in the horizontal.
this solution adds a significant amount of hand holding to the scanning process since you can't trust the iSRD to operate in the automatic mode reliable.
the XEs, on the other hand, when running the exact same software, has not shown a single instance of IR mask mismatch (due to the combined IR/RGB scan) and appears totally reliable automatic operation for iSRD. Total time to preview, frame, and scan is significantly shorter using the XEs than the 8300AI since the iSRD for the XEs works reliably in automatic mode.
in terms of output, the XEs shows finer detail than the 8300AI.
if plustek manages to fix the iSRD mismatch issues of the 8300, it could be a great scanner, but right now, the XEs (although slower) works more reliably and produces a more detailed final image with greater dynamic range.
Total all up cost of the XEs (and software upgraded to silverfast 9 AI) was less than the 8300AI (with the included silverfast 9 AI)