Optical objectives characterised both by the number of the components and their arrangements according to their sign

GPHYSICS G02Optics G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS

G02B9/00Optical objectives characterised both by the number of the components and their arrangements according to their sign

G02B9/02having one + component only G02B9/04having two components only G02B9/06two + components G02B9/08arranged about a stop G02B9/10one + and one - component G02B9/12having three components only G02B9/14arranged + - + G02B9/16all the components being simple G02B9/18only one component having a compound lens G02B9/20the rear component having the compound G02B9/22the middle component having the compound G02B9/24two of the components having compound lenses G02B9/26the front and rear components having compound lenses G02B9/28the middle and rear components having compound lenses G02B9/30the middle component being a - compound meniscus having a + lens G02B9/32the + lens being a meniscus G02B9/34having four components only G02B9/36arranged + -- + G02B9/38both - components being meniscus G02B9/40one - component being compound G02B9/42two - components being compound G02B9/44both - components being biconcave G02B9/46one - component being compound G02B9/48two - components being compound G02B9/50both + components being meniscus G02B9/52the rear + component being compound G02B9/54the front + component being compound G02B9/56all components being simple lenses G02B9/58arranged - + + - G02B9/60having five components only G02B9/62having six components only G02B9/64having more than six components