| 摘要 |
An inverted Galilean finder is composed of an objective lens of a negative power and an eyepiece of a positive power, which are formed from a polystyrene resin by injection molding. The objective lens has a concave surface oriented to the eyepiece, and the eyepiece has a convex surface oriented to the objective lens. The inverted Galilean finder satisfies the following conditions: <paragraph lvl="0"><in-line-formula>-0.75<=f1/f2<=-0.60 </in-line-formula><paragraph lvl="0"><in-line-formula>f1<=-22 </in-line-formula><paragraph lvl="0"><in-line-formula>-3.2<=f1/d<=-1.5 </in-line-formula>wherein f1 is a focal length of the objective lens, f2 is a focal length of the eyepiece, and "d" is an on-axis surface distance between the concave surface of the objective lens and the convex surface of the eyepiece. The inverted Galilean finder of the present invention provides a magnification of about 0.6 to 0.8.
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