Patent ID: 9285659
Filing Date: 2016-03-15
CPC Classification: G03B

Claim Text:
1. An adapter for coupling an optical accessory to an object side portion of the lens apparatus, where a fitting attachment diameter of the optical accessory is larger than a fitting attachment diameter of the lens apparatus, the adapter comprising: an inner diameter portion that fits the object side portion of the lens apparatus; an outer diameter portion that fits the optical accessory; and recessed areas that are separated from each other along a circumferential direction of the inner diameter portion, wherein a diameter of the outer diameter portion is larger than a diameter of the inner diameter portion, and wherein each of the recessed areas extends in an axial direction toward a side from which the lens apparatus is fit so that a width of a part of the inner diameter portion in the axial direction is smaller than a width in the axial direction in other part of the inner diameter portion.