Internal focusing lens

An internal focusing lens includes sequentially from an object side, a first lens group having a positive refractive power; a second lens group having a negative refractive power; and a third lens group having a positive refractive power. During focusing, the second lens group is moved along the opt...

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Bibliographische Detailangaben
Hauptverfasser: HOSOI MASAHARU, SAKAI TAKAHIKO
Format: Patent
Sprache:eng
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Beschreibung
Zusammenfassung:An internal focusing lens includes sequentially from an object side, a first lens group having a positive refractive power; a second lens group having a negative refractive power; and a third lens group having a positive refractive power. During focusing, the second lens group is moved along the optical axis and, the first lens group and the third lens group are fixed. The internal focusing lens satisfies a conditional expression (1) 0.31