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Is it illegal to take an archery sight and attach a non-electronic 2x lens to the sight scope. No cross-hairs just a lens, and hunt big game.

See excel archery sights for an example.

Answer

 It is illegal to use any magnifying lens during an archery-only​ season for big game in Idaho.  However, it is legal to use a magnifying lens while archery hunting during an any-weapon season for big game in Idaho.