
Newton
Galilean · 2.5x–3.5x · $695–$725
Price
Newton is the lowest-cost way into custom loupes. It is a Galilean system at 40–50 g with frame, with a working distance between 300 and 550 mm set to your measurement and a 200 mm depth of field.
It is built for 2.5x–3.5x, and the field of view narrows as magnification rises: 80–120 mm at 2.5x, 60–100 mm at 3.5x. If you already know you will need 4x within a year, start higher instead of buying twice.
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