Yes. Probably we should take the thread back to an overview of Chinese microscopes , something which I clearly don't understand. I need some education about this.
Here is the text from a brochure from the late 1980's. The microscope is a NINGGUANG XSZ-107, 107B and 107N. I found one that sold at auction for 10.00, with a missing fuse cap, which could signal something deeper but it went for 10 bucks. Someone got a pretty good deal, likely. This is what it looks like.https://www.bidspotter.com/en-us/auctio ... 630102d6be
This microscope is provided with achromatic objectives,planoscope eyepieces,abbe condenser,adjustable built-in light source and also coarse and fine adjustment with focus stop. This microscope with his wide field eyepieces gives a nice sharp image and is designed in a very modern way. It is specially designed for clinical examination and teaching demonstration in laboratories, colleges and medical field. It is also an ideal instrument for biological, bacteriological,pathological and pharmaceutical research.
Eyepieces P10X(WF10X) P16X
Achromatic Objectives 4X 10X 40X(s) 100X(oil)(s)
Stage Mechanical Stage 124X153mm
Transversal movement 70mm
Longitudinal movement 50mm
Condenser 1.2 Abbe condenser with iris diaphragm
Reflector Plano-Concave mirror
Illumination systems 6v20W built in brightness variable incandescent lamp
6v20W built in brightness variable halogen lamp
Gross weight 14Kg.
Outside Packing Measurements 39 x 35 x 55cm.
Optional Accessories Phase Contrast Attachment
nothing wrong with that, except they are pushing the peak magnification too far. The brochure is straightforward and informational. The mic seems like a sturdy good quality, well made scope. Look at the weight; 14 kg( 30 lbs.)
I don't think you could buy a NINGGUANG microscope new, in N.A. anymore. A very similar microscope out of the NOIF factory or another mandated to produce it, is still available as an OMAX, with lower grade optics and an overall lowered quality of construction. The shipping weight , including an aluminum carrying case is now down to 24 lbs. It no longer features an attempt at plan performance and some obvious components previously made from machined aluminum or brass, are now plastic.
Here is the text from the on-line brochure covering a very similar microscope to the NINGGUANG XSZ-107 in 2019. The shipping weight on this one is 20 lbs. There seems to have been a radical change in the marketing strategy.
This is an advanced compound microscope that is specially designed for professional applications in clinical offices and research laboratories.It comes with all the advanced features:large 3-D double layer mechanical stage,coaxial coarse & fine focusing system,and brightness-adjustable halogen illumination.It offers eight levels of magnification 40X-80X-100X-200X-400X-800X-1000X-2000X. It is a perfect instrument for clinics,vets,doctors and medical school students.
Fully Coated Optical System with High Resolution Showing Sharp Image
45-degree Inclined 360-degree Swiveling Sliding Binocular Head
Large 3-D Double Layer Mechanical Stage with Stain Resistant Finish
Low Position Coaxial Stage Movement Control
Coaxial Coarse Fine Focusing with CA Knob Tension Control
Fully Coated Optical System with High Resolution
High Quality Professional Grade Microscope with Crystal Clear Sharp Images
Perfect for Clinics,Vets,Doctors and Medical School Students
Eight Magnification Settings: 40X-80X-100X-200X-400X-800X-1000X-2000X
Upward Stage Stopper to Protect Slides and Objectives
Abbe Condenser with Iris Diaphragm Filters
Rack and Pinion Control for Condenser
Built in Halogen Illumination System with Variable Intensity
Dual Side Focusing Controls
Four DIN Achromatic Objectives
Two Sets of Eyepieces
Full Optical Glass Elements
Precise Ground Glass Lenses
All Metal Mechanical Components
Adjustable Interpupillary Distance
Adjustable Diopter on Ocular
Rugged Metal Frame and Stand with Stain Resistant Enamel Finish
Spare Bulb, Fuse and Immersion Oil Included
Manufactured Under ISO 9001 Quality Control Standards
Excellent Five(5) Year Factory Warranty
It goes on to list the specifications, in some cases for the 3rd time.
Can someone explain what is going on here? What is a 3-D stage double layer stage? What is High Resolution and how do you know you have it? It is mentioned twice. This microscope seems to have really high magnification. I saw another one that was made by a company called Nikon and it was only 1000X. Does that mean this one is better? What are iris diaphragm filters? What is the difference between full glass optical elements and precise ground glass lenses? They seem to be different things.