if you can go up to $3000.00 , then you should look into the Bestscope BS-2081. You can sneak a planachromat 6 objective one in under that and have a platform you can build on if you ever want to. It accepts modern Nikon or Seiwa made objectives, so not limiting but their own better colour corrected objectives ( Planfluor) are not shabby. It is a better and more vesatile platform than the Nikon E200. They no doubt manufacture the E200 for Nikon. All the less expensive scopes from the big 4 are Chinese made, now. Nikon and everybody else deliberately limit versatility on their less expensive microscopes in order to upsell in the future.
The BS-2081 is Bestscope's flagship stand, so it has more capability and a greater range of accessories than the Nikon E200, which in ways is a much more expensive less versatile competitor, hanging on the Nikon name
Two forum members have recently bought the BS-2081 after I alerted one and then he another to that option through a post. I gather they are very pleased.
https://www.bestscope.net/bs-2081-resea ... icroscope/
The optical system the 2081 uses is a 60mm parfocal infinity system. It is the same system Nikon currently uses thtoughout it's range with the exception of the entry level Nikon E100, which uses a more common 45mm parfocal infinity system. Bestscope and other Chinese company's using that system call it the NIS60 system, standing for Nikon Infinity System 60mm parfocal. The objective threads are large : 25mm compared to the standard R.M.S. thread of .8" whitworth, or just over 20mm. Manufacturers are opting for longer parfocal lengths as fields of view expand and corrections for aberr6ations are more finely controlled in the objective, since more glass elements are needed to perform those tasks.
In the product picture supplied on the website, it is difficult to compare the BS-2081 to a standard Chinese 45mm parfocal microscope but taking into account the size of the objectives in the nosepiece, one can see that it is a much bigger microscope stand than most 45mm parfocal stands.