omnivorr, Hi. F:27 is the bottom limit, the big problem with the scope is the lateral chromatic aberration caused by the outside edge of the lens where the prism effect is greatest, you have to cut the angle between the back surface and the curved front of the objective lens to a minimum, and this means at least F:40, more than this and the scope becomes inpractical, however I amd getting reasonable results at F:23. so your lens should be OK..just.
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