the larger the objective is the shallower the depth of field is at any magnification. in cameras it is expressed as the F stop. An F 2.8 lense will have a shallower depth of field than an F 4 lense. The F 2.8 lense will have a larger objective for a given magnification. the shallower the depth of field, the better the range finding. a 60mm objective at 12 power is going to rangefind better than a 40mm objective at 12 power.
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