I'm using Plustek 7200 with Silverfast Ai Studio Ver. 6.6. It is a very capable scanning solution for negative and positive transparency. You will need the IT8 calibration slide for the film that you have to ensure accurate colour representation. I have one for Ektachrome and one for Kodachrome. There is also a 35mm version of the 1951 USAF resolution target available to determine best scan resolution for your hardware.
I have nearly 3000 slides and have decided to scan each at 5400dpi giving me 100MB TIFF at 48-24bit colour. 48bit colour is available amongst other settings. At 5400 dpi each takes approx. 3 minutes to scan but considerably longer to tweak the settings such as exposure, balance, colour, curves and many others. Settings can be saved and recalled for the next slide if needed. I could not see a difference at 7200dpi and saved on scanning time and disk space by going 5400 and this will give large format prints at good resolution should I ever need it. I went 48-24 bit so I could open in Photoshop Elements but perhaps in hindsight should have just used 48bit Colour for archiving and edit further in Photoshop should I ever subscribe to it. I can always redo my first 1000 or so.
Multi-exposure to enhance dynamic range and scratch and dust removal is also standard with Ai Studio but these all add to the scanning time considerably. I am currently scanning some old slides for a school and they are averaging 20 minutes each to process.
Note whilst you can buy the scanner and software package here you will have to but any IT8 slides from Lasersoft and the currency will be in EUR not USD when you enter your destination as Australia as they ship out of Germany using DHL. Unfortunately shipping is 29EURO min. for a calibration slide so buy one for each type of film you have the most slides of to save on freight.
The current Plustek model to get is the 8200i which comes with Silverfast Ai Studio Ver.8 and it will set you back approx. $700 in AUS. This package also includes one calibration slide and it is likely Ektachrome and will get you going. If you have a lot of Kodachrome you will need a calibration slide for it and ensure you change your scan settings to Kodachrome otherwise you will get a blue cast.
You could easily spend $1000+ on hardware, software and calibration slides (100EUR each typically) and you have to ask yourself what do you want to do with the final scan. I think scanning is still available commercially but if you have a lot of slides and time on your hands then doing it yourself will save you in the long term and the results with the right hardware and software are very good.
See
https://www.silverfast.com/
http://plustek.com/usa/
https://www.camera-warehouse.com.au/...i-film-scanner
https://www.digitalcamerawarehouse.c...i-film-scanner