I have an ultra cheapie. However Belomo loupes are the way to go. Made in Eastern Europe (or Russia) I believe. Great quality at good prices (compared to Zeiss, Leica, Schneider, Rodenstock, Nikon, etc), but you dont need a fancy loupe to spy the subpixel structures. I recommend the 12x and 15x Belomo loupes. Bausch & Lomb Hastings 14x loupes are good too. Something higher than 10x and lower than 20x gives you good compromise in magnification and field of view, and edge over 10x without the small glass and rapidly shrinking field of view of 20x and over. The Belomo's are better constructed with better glass than current B&L Hastings loupes, and cheaper to boot.
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