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These objectives are achromats (partially corrected to remove chromatic aberration) and are planar, so the field of view is flat to the edges (no fish eye look). The two eyepieces are 10x power with 20mm field of view, so in combination, your visual field is 5mm with the 4x and 2mm with the 10x.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.