An object-finder-mounting apparatus comprises: a base for mounting the object-finder-mounting apparatus to an optical instrument; an object-finder-holder assembly coupled to the base and comprising one or more object-finder holders for removably holding an object finder; a projection plate moveably coupled to the base and/or the object-finder-holder assembly for movement between first and second positions; and a shadow-casting member. The object-finder-mounting apparatus is convertible between first and second working modes. In the first working mode, the projection plate is moved to the first position which permits use of the object finder held by the object-finder holders to locate objects. In the second working mode, the object finder is removed from the object-finder holders and the projection plate is moved to the second position. In the second working mode, the shadow-casting member casts a shadow onto the projection plate when the optical instrument is directed toward a luminous object.
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