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Question about Canon CanoScan 8400F Film Scanner

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Unwanted cropping of some 35mm slides using CanoScan 8400F

Using the 'Canoscan 8400F', when scanning slides, whether the older square ones, or the more common rectangular ones, the scanner is often not coming up with the correct 'Film Size' in 'Input Settings', and unacceptable cropping of the image occurs in both 'Simple Mode' and 'Advanced Mode'.

The width (approx 3.49cm) is correctly detected, but the height is often wrong, and if I attempt to make it larger, e.g. approx 2.3 cm (instead of the around 1.9cm or 2.0cm detected), I get the message: "An invalid number was specified".

For me, a fix for this is required URGENTLY! Please help!

Posted by uwe sinn on


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Turn off the thumbnails view and you can manually set the cropping box.

Posted on Dec 02, 2007

  • Anonymous Dec 02, 2007

    you can also try

    the scanner doesn't have the DMAX to "help" these slides. Try
    >using the RGB Exposure control on Vuescan. You can "pump" more light through
    >the negative. Crank the value up as high as it will go, 11 I think (probably



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Related Questions:


I have a Canon 8400F film printer/scanner

'Tain't necessary. And not getting the part can be an improvement.
I cut out a cardboard template that allows me to scan 10 slides rather than the 4 of Canon's official slide adapter.

All the Canon part does is position them precisely so cropping and rotation are automatic. With Photoshop skills (File ' Automate), you can do the same yourself for whatever size. I ended up doing Brownie, 35, and 126 (gasp!) also.

For extra credit, make your adapter(s) out of genuine plastic rather than whatever cereal box you have lying around.

Unable to set CanoScan 8400F for color slides. The protective sheet has been removed from the document cover, and the slide film guide installed. Photo Studio Acquire panel Source selection has only...

kindly let me know your operating system so that i can give you precise solution. By the way you should go with the review for which I am providing a link below. If this does not solves ur problem kindly let me know alongwith ur operating system.

How to scan slides to photos to hard drive using canon canoscan 8400f

Your scanner came with some software inside the box. If this is a second hand scanner with no additional software download the drivers from and run the software accordingly.
Mac os X does not require this process. connect the scanner to your machine and simply load the slides in the tray scanner and use the application "IMAGE CAPTURE" located in local_disk/applications/
The pictures automatically load and you select to crop or scan as is.
Later the image will appear on the desktop upon completion of scan.
For windows: I made you a link for your convenience:

Dark streak when scanning film on canoscan 8400F

please clean scanner mirror then solve this problem

Canon 8400f suddenly will not allow neg scan option

just had the same problem, check the connection going into the top part of the scanner at the back and restart which ever program your using... got mine sorted


Please see my other postings (wireguy) regarding this same problem. It's caused by a faulty FAU cable.

CanoScan 8400F

Try this:

Open the CanoScan Toolbox.
Click the Save option.
Put a check in the box that states "Display the Scanner Driver".
Click Scan.
Click the Advanced Mode tab.
Make sure Select Source is set to "Platen".
Click the Preview button at the top left.
If the error still occurs, then most likely it will be a service issue.

One thing to check...see if the inside lamp illuminates when you turn the scanner on using the power button at the back left side of the scanner.

Not scanning

You have tried everything possible!. Try and reinstall the OS. If some dll files are corrupted, this will resolve it. You may have to reinstall all other software!

S. Mohan
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