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Posted: 6/5/2016 2:28:16 AM EDT
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I am shopping around for a variable scope, and I have a question/concern about field of view values reported by manufacturers.
Two scopes I am comparing: Nikon Prostaff 2-7x32mm FOV @ 100 yds: 44.5' - 12.6' Leupold VX-I 2-7x33mm FOV @ 100 yds: 43.2' - 17.3' Both scopes have identical zoom ranges. Both have similar FOVs at 2x, with the Nikon's being slightly larger. However, at 7x, the Leupold has a significantly higher FOV. This does not make sense to me. I'm pretty sure that for a variable power scope, the zoom setting times its field of view should be constant. The numbers for the Nikon seem to check out: Low power: 2 * 44.5' = 89 High power: 7 * 12.6' = 88.2 However, Leupold appears to be over-reporting the FOV at max power: Low power: 2 * 43.2' = 86.4 High power: 7 * 17.3' = 121.3 I know that actual magnification may differ from what the manufacturer reports, but these numbers seem way far off. The scope's zoom range should also equal to the ratio of max FOV to min FOV. Both scopes are advertised as having a 3.5 zoom range. Nikon: 44.5/12.6' = 3.53 Leupold: 43.2/17.3 = 2.54 Using what Leupold reports for the FOVs, it appears the VX-I scope may only have a 2.5 zoom range. For example, instead of a 2-7x, it's a 2-5x scope. Any thoughts? Should I disregard Leupold's numbers as being incorrect? |
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