General introduction:A catadioptric lens is a type of mirror that utilizes a concave surface located at the end of the lens barrel, closest to the camera. The light hits the parabolic surface of the mirror, reflects towards its focal point, and is reflected back to the camera by a smaller mirror. The reflected image passes through the circular hole in the center of the main mirror and is further focused by various lens units before being transmitted to the camera.
Product Description:Reflex, also known as reflective lens, reflective telephoto lens, is a special form of super telephoto lens. The focal length of a super telephoto lens is particularly long (above 400mm), and the lens body is long and heavy. For example, a lens with a focal length above 1000mm is at least 500mm long, which is inconvenient to carry, shoot and use. The reflective lens is equivalent to adding a concave mirror with a hole in the center and a small concave mirror installed in the center of the lens on the basis of the ordinary lens. Therefore, the length of the lens is shortened by about half compared with the telephoto lens of the same focal length, and the entire length is only a quarter of the focal length, the weight is greatly reduced, the shooting and carrying are flexible and convenient, and there is no chromatic aberration. (Spherical and other aberrations are corrected). The external characteristic of reflex lenses is that they are short and fat.
Product advantages:
The popular name of this lens is called "reflector", and its advantage is that a relatively short lens barrel can achieve a very long focal length. Therefore, a typical 500mm reflector will not exceed 4 inches in length. Ordinary 500 mm far The reflex head is arguably quite short compared to a camera lens that may be a foot or more long; and this smaller size is a great convenience when traveling with a lot of lenses. Because the mirror does not have an aperture device, its bokeh is circular and wave-like.
Product features:
1.There is only one aperture, and it is a smaller aperture. The need to use only one smaller aperture is to reduce the size of the lens, but there is only one smaller aperture, resulting in very low illumination of the viewfinder system, which is not only unfavorable for focusing according to the split-image and microprism focusing instructions, but also unfavorable for Exposure control can only be controlled by changing the exposure time or adding a neutral gray filter. The camera's programmed exposure and shutter-priority automatic exposure cannot be used, and the depth of field cannot be effectively controlled.
2.High light points outside the depth of field during imaging do not become light spots on the screen like usual lens imaging, but show small circles, forming beautiful annular defocusing, which is dazzling and dazzling, and should be used skillfully in actual shooting .
3.Shooting with a small depth of field, focus very carefully, and use a tripod to stabilize the camera as much as possible to avoid camera shake. The small depth of field of the catadioptric lens can produce a unique hazy effect beyond the depth of field. Reflex lenses also have the valuable feature of not producing chromatic aberration.
Since the light is reflected twice in the catadioptric lens, the light is attenuated more, so it should be properly compensated when manually determining the exposure. The specific compensation amount can be determined by comparing the light with a camera with a light metering device.
Main Cooperation Materials Manufacturers: CORNING, OHARA, SCHOTT, LEONI, AGC,HELLMA, NIKON,VITRON,C-LASER,ETC
Main Export Countries & Areas: Usa, Uk, Japan, Germany, Spain, France, Swiss, Korea, Russia, Pakistan, India, Portugal, Canada, New Zealand, Australia, Saudi Arab, Turkey, Finland, Poland ,etc.
Raytekoptics Extra value added services offered: 1). Optical workcraft & process solution design; 2). Rough processing raw materials; 3). Semi finishing raw materials; 4). Fabricate custom sizes and shapes; 5). Design and supply custom coatings; 6). Modify and resurface customer supplied materials; 7). Drill holes, notch glass and provide beveled substrates; 8). Precision polish optics with non-standard aspect ratios;
Payment Method: by T/T or Western Union. Delivery time: 7-10 days. Quality Warranty: Ruitaiphotoelectric(Raytekoptics) offersquality warranty for our optics products with "3R" policy. For any inferior-quality products, Ruitaiphotoelectric(Raytekoptics) is responsible for return, replacement and refund.
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