Tunable filter with switchable application modes

Abstract

The invention relates to a tunable filter with switchable application modes. The tunable filter comprises an annular front lens frame and an annular rear lens frame which are mutually and rotatably connected and are provided with a first lens and a second lens respectively, an arc-shaped long focus tunable clamping groove and a wide angle tunable clamping groove are arranged on the side wall, towards the annular rear lens frame, of the annular front mirror frame, and the wide angle tunable clamping groove is formed in the bottom of the long focus tunable clamping groove. A switching clamping pin which can be moved front and back is arranged on the side wall, towards the annular front lens frame, of the annular rear lens frame, a switching control key which can be wrenched front and back is arranged on the outer side wall, corresponding to the switching clamping pin, of the annular rear mirror frame, and the switching control key stretches into the annular rear mirror frame and is connected with the switching clamping pin. The switching clamping pin is movably clamped in the long focus tunable clamping groove or the wide angle tunable clamping groove in a switchable mode, switching of the long focus tunable mode and the wide angle tunable mode is achieved, and therefore the tunable filter can be arranged on a long focus lens or a wide angle lens for use, adjustment is convenient and easy, cross facula and shadow are prevented from appearing, the structure is simple and reasonable, and the switching operation is convenient and rapid.

Description

technical field [0001] The invention relates to the technical field of camera filter adjustment, in particular to an adjustable filter with switchable application modes. Background technique [0002] At present, CPL polarizers and ND mirrors (neutral density filters) are commonly used filters on SLR cameras; among them, CPL polarizers mainly function as CPL polarizers to weaken reflected light, and are often used to filter out reflected light from glass windows. It makes the glass more clear and transparent, and it is also used to filter out the polarized light in the sky, making the contrast between the sky clearer and more real; ND mirrors are mainly used to reduce the amount of light passing through, shooting outdoors in strong sunlight, or in normal light When using a longer exposure time under certain conditions, it is necessary to use an ND mirror to assist. [0003] Now there are adjustable ND filters on the market. When users install the filter on a wide-angle lens ...

AI Technical Summary

Problems solved by technology

For example: to install a filter on a wide-angle lens and use it, you have to find a suitable position slowly. It is very inconvenient to use and adjust, it is very time-consuming, and there will be spots and shadows, which will affect the shooting effect.

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