Camera lens circular filter dismounting device for bridge construction site shooting

Abstract

A camera lens circular filter dismounting device for bridge construction site shooting is characterized in that a filter I and a filter II which are stacked together are integrally rotated anticlockwise relative to a lens, then the lens is fixed at a bayonet on a lens mount, and according to the height of the lens, after a sliding block I slides up and down to a proper height, screw rods I are rotated until the inner side ends of the screw rods I is in close contact with the outer edge of the filter II; and after a sliding block II slides up and down to a proper height, screw rods II are rotated until the inner side ends of the screw rods II are in close contact with the outer edge of the filter I. When the inner cylinder rotates clockwise, the two screw rods II drive the filter I to rotate clockwise to enable the filter I to be screwed tightly relative to the lens when the inner cylinder rotates clockwise, and under the action of the power driving mechanism, the outer cylinder rotatesanticlockwise synchronously when the inner cylinder rotates clockwise. At the moment, the outer cylinder rotates the filter II anticlockwise through the two screw rods II drive the filter I to rotateclockwise to I for clamping the filter II, at the moment, the filter I rotates clockwise, the filter II rotates anticlockwise, and therefore the filter II can be unscrewed from the filter I.

Description

technical field [0001] The invention relates to a dismounting mechanism for a circular filter, in particular to a dismounting device for a circular filter of a camera lens used for photographing at a bridge construction site. Background technique [0002] At the bridge construction site, it is necessary to regularly take pictures of the bridge under construction and the construction site. Because the length of the bridge is often large, it is necessary to use a professional SLR camera or mirrorless camera with a wide-angle lens to shoot. The focal length of the wide-angle lens is generally between 14-30mm. . For the complex and changeable light at the construction site, filters need to be used when shooting, and the conventional ones include ND filters, neutral gray filters, gradient filters and polarizing filters. Different types of filters often need to be superimposed. The filter system of the lens is divided into two types, one is the square mirror system, the filter i...

AI Technical Summary

Problems solved by technology

Due to the cumbersome installation of the square mirror system, its high purchase cost and the disadvantages of taking up a large volume, it is often only a tool for high-end professional photographers

The most widely used is the circular mirror system, but when the circular mirror system is superimposed, such as superimposing the ND mirror on the UV mirror or superimposing the polarizing mirror on the ND mirror, the upper lens is not easy to separate from the lower lens. Because the outer metal ring of the lens is relatively thin, it is not easy to pinch the upper lens with one hand and rotate counterclockwise while the other hand needs to pinch the lower lens with fingers to apply force in a clockwise direction.

Therefore, it is often the case that the filter is not easy to disassemble after use.

Images