I've used the Imacon 646 and the Creo iQsmart1. My take on them;
Imacon 646 (CCD Scanner, from 35mm to 5*10" trannie/ reflective)
- easy to use, film holders are magnetic, hold film flat and well constructed. No glass between lens and film path.
- The unit has a small footprint and sits nicely on a desk, within arms reach.
- Speed is acceptable, and it's not too noisy either.
- Software is available for Mac and PC and is really easy to use. has dust and scratch removal module as well. It used to be an add-on, I've heard it comes with the 646 now.
- Scans were excellent, good shadow detail and accurate colours.
- I was scanning 120 film (6*6 and 6*17), you can batch the 6*6 but only 3 at a time. It can get tedious if you have 1000's of scans to do. 35mm is better, you can get 12 up at once and batch them.
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Creo iQsmart1 - 11*17" FlatBed scanner (newer than Imacon 646)
- Flatbed scanner, has anti-newton glass bed.
- Software is excellent, but no dust and scratch removal. There is an add-on workflow module that let's you colour correct while the scanner is scanning but it costs extra, about US$1500-2000.
- I found the scans (from the same negs as the Imacon scans) to be a bit dull/washed out, not sure if the Anti-Newton Glass has anything to do with it.
- It's a HUGE device! You will need a large, sturdy desk to place it on.
- It's fast.
- Software is available on PC but a Mac version is recommended.
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The 646 is not a Bad Buy. You really have to go have a demo with each of these scanners, scan the same trannies / negs on each one and look at them sided by side on your screen and have good prints made (lightjets). I have not used the 848, it is a 'better' scanner (faster, actively cooled CCD, more resolution and DMax) but it is more money. It all depends on you, what do you want to do? Scan a few images well, or scan thousands in a production type environment? How much space do you have in your house? Do you like to use oil in scanning to get rid of dust / scratch (for the Creo). The software is a VERY important consideration too.
There's never a clear answer as we're all different! Go and test them, you'll get a sense of preference right away.
If you're in the UK, ICG out of Bristol do a great drum scanner which would be about the same price if not less, but the software is OS9 only.
Happy hunting.