high-quality optics manufacturers

There's so many low-quality products out there that it can be hard to find the few that are higher-end.

Products I'm interested in:

• measuring loupes, AKA scale loupes
• measuring microscopes, AKA scale microscopes
• industrial microscopes — Some can be used to make precise measurements, others can be used for visual inspections of small parts such as PCBs.

Manufacturers:

• Peak Optics [measuring] [pocket microscopes]
• Bausch and Lomb [loupes]
• Edmund Optics [2] [general]
• Carson, a little lower-end, but has a few measuring loupes [loupes]
• Graticules Optics, specialized [measuring]

Retailers:

• Magnifier.com
• McMaster-Carr
• Grainger
• Ted Pella
• SPI, Structure Probe Inc., specialized
• Digikey??
• retailers that I haven't vetted yet, it's possible they're junk:
  • Pepler Optics
  • FLS Discount Supplies [measuring]
  • Start International
  • The Loupe Store