こちらへ→ Sport Optics: Binoculars, Spotting Scopes & Riflescopes "Sport Optics" is a helpful guide for purchasers of binoculars, riflescopes, and spotting scopes for use in hunting, bird watching, astronomy, nature viewing, and other hobbies. The book helps one make the correct purchasing decision after considering the various optical parameters with the intended use for the product. The author has been in the optical industry for over 50 years selling and designing optical instruments and intimately knows optics. [ショップ情報引用]
