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Film and slide scanners have optics in them. Better optics allows better scans, but it costs more.
Scanners, or at least the decent scanners, have a DMax value that indicates the dynamic range they can capture. Some cheaper scanners quote a high DMax but are actually referring to 16-Bit per channel capacity of the scan file rather than how many of those bits are usable.
Nikon Coolscans were excellent and probably still are, but Nikon stopped supporting them years ago. That was easier than keeping up with Windows for a low-volume item.
If you are scanning slides yourself and processing them a bit like you might a DSLR file (i.e. as a photographer rather than as a typical member of the public who puts up with anything that remotely resembles a "picture"), then budget about 10 minutes per scanned image. That will include figuring out what to do with the originals so that you'll know exactly where they are if you decide you want a better scan later on.
1,000 slides at 10 minutes each will take 166 hours, or about 3 weeks of full-time work. Slide scanning is usually a long-term project.
Also, 1 scan at 4000dpi and 16bits/channel will create a 130+ MB tiff file. Unless you spend a lot of time tweaking each scan as you go, you'll need the flexibility of 16-bit tiff files to let you extract the optimum 8-bit jpeg file from it for long-term storage. otherwise you may lose a lot of highlights and / or shadows, which may then require a re-scan.
On the bright side, if you can afford the time needed to process many slides then you can more easily justify buying a decent scanner
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