Mostly a matter of magnififcation. The SF50 runs 2.4X– 47.2X, which is typical and usually enough for any application calling for a stereo. The SF-100 runs 4.8x to 98x, which is unusually high for a stereo, but, of course, you still have access to lower magnifications.
The SF50 also has one of the longest working distances for a stereo at 6.7". Makes it widely used for industrial applications with large objects are observed. The SF100 is a more typical 3.7", enough for most applications.
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