Angel wing seals for turbines are described. The conventional column type energy absorption member is weak against an impact applied in a direction within a wide angle such as an impact applied in an oblique direction. The taking optical system comprises an optical path splitter means operable to split an optical path into the finder optical system, and the finder optical system includes a relay optical system RLS for re-forming a subject image once. The plurality of rings provides selective locking engagement between the inner and outer rings. The golf ball is attached to an extension and retraction system comprising two spherical seats inserted in the heel side and toe side of the opening and two ligaments connecting the spherical seats to the golf ball.