Long focal length lens with combination of photography and visual telescope

Abstract

The invention discloses a long focal length lens with a combination of photography and a visual telescope. The long focal length lens comprises a photographic object lens, a bayonet switch ring, a camera, an image rotation system and an ocular lens. The invention is characterized in that: the photographic object lens is internally provided with an aperture adjusting mechanism and a focusing mechanism; the photographic object lens is connected with the camera through the bayonet switch ring to form a photographic long focal length lens; and the photographic object lens is connected with the ocular lens through the image rotation system to form a visual telescope long focal length system. The invention has the following advantages that: the photographic object lens employs an inner focusingmode, in the case that tube length is not changed, sensitivity in focusing can be increased effectively, the bayonet switch ring allows rapid and correct positioning of the photographic object lens and a single-lens reflex camera, various short flange distance single-lens reflex cameras can be cooperated through different bayonet switch rings, the image rotation system with an aberration correction function is cooperated with the visual telescope for observation, and that photography and visual systems correct optical aberration respectively is realized.

Description

【Technical field】 [0001] The invention relates to a telephoto lens, in particular to a telephoto lens combining photography and telescopic vision, which is suitable for telephoto photography and telescopic vision. 【Background technique】 [0002] A telephoto lens for photography refers to a photographic objective lens with a focal length longer than the standard size. The standard lens for 35mm film photography has a focal length equivalent to 50mm, and anything longer than 50mm is a telephoto lens. The telephoto lens with fixed focal length on the market adopts the method of internal lens movement to focus, and then focuses and images on the sensor in the digital SLR camera from infinity to the near-end range. The full-frame size is for the traditional 135 film with a photosensitive area of ​​36x24mm. Each SLR lens is only suitable for the flange distance of its own SLR digital camera, and the length of the flange distance of each camera is not longer than 50mm, so there is...

AI Technical Summary

Problems solved by technology

The astronomical telescopic optical system mainly adopts the method of changing the tube length (with a telescopic tube) to move the last group of lenses or the entire objective lens tube back and forth to achieve focusing at different observation distances; the disadvantage of this method of changing the tube length is that , when focusing from the infinity distance to the near-end distance, the imaging quality outside the central field of view will be greatly reduced, but compared with astronomical telescopes with small field of view, the evaluation of resolution is mainly based on the central field of view field, so the method of stretching and focusing by changing the tube length will not affect the observation and use of the astronomical telescope

However, if this focusing method is used to take pictures with a 135 (full-frame) SLR camera that requires a large imaging field of view, the imaging of this telephoto system outside the near-focus center field of view cannot meet the basic requirements of photography, mainly reflected in Resolution, chromatic aberration, field curvature and other image quality cannot meet the requirements

[0004] At present, there are only telephoto lenses for single photography and telescopes for visual use in the market, and there is no telephoto lens that can satisfy both telephoto shooting and large field of view telescopic observation.

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