Canon lens filter tightening direction
Canon lenses were usually tightened in a clockwise direction. However, before installing the filter, you need to check whether the filter fits the camera. You can check the lens size on the camera dust cover and the size of the lens outer ring. Turn the threaded surface of the filter to the lens and carefully rotate it clockwise to the bottom, but it may not be very tight. If you want to disassemble the Canon 18 - 135 lens filter, you should twist it counterclockwise. If you can't twist it, you can use some special methods, such as using a cotton swab to dip a little sewing machine oil in the gap between the filter and the lens. Let it stand for a while before twisting it, but the oil should not be too much to avoid affecting the lens. In addition, if the screw thread was misaligned during the installation of the filter, it needed to be handled before installation. Read more exciting novels for free
Canon lens, Nikon lens
Canon lenses and Nikon lenses were well-known brands in the field of camera lenses. In terms of Nikon lenses, the new Z-mount lenses were generally of high quality, such as holo-field compatibility and excellent corner resolution. The F-mount was limited by the caliber and the distance between the two sides, while the Z-mount had a great improvement in this aspect, especially in the wide-angle to mid-focal length section. Canon lenses, such as the RF28 - 70mm F2.8 lens, had a constant large aperture of F2.8. It was portable, and the image quality was average, even a little beyond the positioning of the silver ring lens. It also had anti-shake function. However, its price was sometimes affected by marketing routines. For example, during the 11/11 period, the price of Canon RF28 - 70mm was higher than the recommended price on the official website and did not return to normal value. These two lenses had their own optical design features, advantages, and market positioning under different camera mount systems. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
The direction of the laparoscope lens
In a laparoscopy, in order to achieve better exposure of the surgical field, the camera angle could be adjusted in many ways. For example, adjust the direction of the lens by grasping the eight-word key words of "bubble, rub, flat, center, advance, retreat, rotate, and follow"."flat" meant to make the base of the laparoscope flat so that the field of view was in line with the habits of laparotomy.(Generally, the lower edge of the liver and the spleen are used as horizontal references.)"Advance" can make the target area more clear but the field of view is smaller."Retreat" can make the field of view larger but the clarity of the target area is reduced.(It is generally used to understand the relationship between the surgical field and the surrounding structures),"Rotation"(30-degree rotation of the laparoscope) can observe the target tissue structure from different sides, and "Following" can follow the thoughts of the chief surgeon. Through the operations of advancing, retreating, rotating, and following, the viewing angle and direction of the laparoscope can be adjusted in real time according to the surgical needs to ensure clear exposure of the surgical field. In addition, the adjustment of the direction of the lens was indirectly affected by changing the method of hole arrangement (following the principle of isosceles-triangle with the focus as the apex, or the principle of establishing observation holes and operating holes in a fan-shaped shape with the focus as the center), adjusting the angle between the left and right operating rods (more than 60 degrees was conducive to the operation and did not affect the exposure of the laparoscope), so as to achieve the ideal surgical field exposure effect. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Canon camera lens
In Canon lenses, the half-frame lens was a golden circle 17mm-55mm F2.8 lens. There are many red circle lenses in the common lens of the full frame, such as 24mm-70mm F4, 24mm-105mm F2.8, 24mm-105mm F4, 70mm-200mm F4, 100mm-400mm (golden circle), 70mm-300mm f.(The specific parameters after the aperture are not specified), etc. Among them, 70 - 200mm F2.8 is also regarded as the lens of the Emperor of Mirrors. These lenses had excellent performance in their respective focal lengths and application scenarios, such as excellent image quality and focal length adaptability. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Canon lens parameters
Canon lenses had many parameters: ** 1. Type of bayonet ** 1. **EF** - It can be used directly on Canon's Canon's Canon 'Canon's Canon' Canon 2. **EF - S** - Canon's APS-C frame DSLR lens could not be directly installed on a full-frame DSLR. It could be used on the Eos-M series micro-lens and the Eos-R full-frame micro-lens through the transfer ring. 3. **EF - M** - Canon's Canon 'Canon's Canon's Canon 4. **RF** - Canon's Canon 5. **MP - E** - For macro photography, only MP-E 65mm f/2.81 - 5x. 6. **TS - E** - The electronic control shifted the lens. ** 2. Focus ** - The focal length in the lens model was the physical focal length. Standing in the same position, a small focal length meant a wide field of view, and a large focal length meant a good range of vision. For non-full-frame cameras, the actual use may need to consider the equivalent factor conversion according to the camera model. For example, the focal length range of the lens was 70 - 200mm, the angle of view at the 70mm end was relatively narrow, and the telescope ability at the 200mm end was better. ** 3. Maximum aperture ** 1. ** Permanent Aperture ** - For example,"f/2.8" could be set to this aperture value over the entire focal length range. For example, the EF70 - 200mm f/2.8 lens was a constant aperture lens. 2. ** Floating Aperture ** - Two numbers like "f/3.5 - 5.6" indicated that the maximum aperture changed over the entire focal length range. ** 4. Screen Level Identification ** - **L (Luxury) logo ** - It would only appear in Canon's professional lens identification information. It was the logo of the top Canon civilian lens. These lenses usually had a red decorative ring on the front end (red circle head). ** 5. Function ID ** 1. **IS (Image Stabilizer)** - This type of lens was equipped with Canon's unique image stabilizing device, which could offset the image blurring caused by hand shaking within a certain range. It was commonly used in Canon's high-end professional lenses. 2. **USM (ultrasonic motor)** - The lens using USM technology could achieve silent and fast-response autofocus. It was divided into three types: micro, ring, and NANO. There was also the STMs (Stepping Focus Machines), which were divided into two types: gear type and lead screw type. 3. **AL (Aspherical lens)** - It showed that the lens was designed with aspheric lenses to reduce the number of lenses. While reducing the weight and volume, it could provide better optical performance. It could solve the glare and edge distortion problems in wide-angle and zoom lenses, and it could also improve the optical quality of telephoto lenses. 4. **DO (Diffraction Optics)** - Lenses marked with this logo were equipped with multi-layered diffusing optical lenses, which had the characteristics of both fluorite and aspheric lenses. They were generally high-end Canon lenses. 5. ** DPS (a coating technology that optimized bokeh)** - It was commonly used in some Canon lenses to enhance the bokeh effect. 6. ** S-ud (S-ud glass) and UD (UD glass)** - The optical performance of S-KD glass was close to that of fluorite. The effect of one S-KD lens was equivalent to that of one fluorite lens, and the effect of two KD lenses was equivalent to that of one fluorite lens. These labels indicated that the lenses used the corresponding glass lenses. 7. **EMD (Electromagnetic Aperture)** - Lenses with this technology could open and close the aperture by electronic control. 8. **Float (Floating Function)** - When shooting at close range, the floating lens would compensate for the aberrations at close range to obtain better image quality. 9. ** CP (Focus Preset)** - It was Canon's high-end professional lens logo. The focus preset function allowed the lens to remember a certain focus distance. After setting the distance, the lens could automatically return to the set focus distance. This focus recovery function was even effective in manual focus mode. 10. ** ft-m (full-time manual)** - Canon lenses were equipped with full-time manual operation. The focus of the lens could be adjusted manually in the AF-mode. 11. ** Marco/macro ** - It means that the camera has a strong close-up ability. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Canon lens and Nikon lens interface differences
Canon lenses mainly had the lens mount, which was Canon's full-frame single-lens reflex camera mount, as well as the lens mount, such as the ESF-S mount, the ESF-M mount, and the lens mount. Nikon lenses mainly had the lens mount, such as the F-mount, and the Z-mount. Their bayonet types were different, and their size, the distance between the two sides, the number and location of electronic contacts, and other parameters were also different. These differences determined the compatibility between the lens and the body, as well as the realization of functions. For example, Canon's RF-mount and Nikon's Z-mount were large-caliber mounts, but there were still differences in specific size and other characteristics. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Telephoto camera filter lens recommended
For the telephoto camera lens, there is a chameleon 900mm f/8.0.(Nikon Z-mount, Pentax mount, Canon EF-M mount, etc.), Chameleon 650 - 1300mm f/8.3 (There are 4/3 ports, Pentax ports, Soni E ports, etc.), Chameleon 420 - 800mm f/8.3 (there are 4/3 ports, Soni ports, etc.), Tenglong 50 - 300mm F4.5 - 6.3 Di III VCXD, Tenglong 50 - 400mm lens, etc. As for the filter, the commonly used lens filter on the market included the UV-lens, the Polarizer, the Black Soft lens, the Starlight lens, and the Light Reduction lens. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
The direction of motion inside the lens
The direction of movement inside the lens mainly included vertical, horizontal, and vertical directions. There were two types of movement in the vertical direction: pushing the camera (pushing the subject from far to near) and pulling the camera (gradually moving away from the subject); horizontal movement included shaking the camera (the camera was placed in a fixed position and panned left and right or up and down), moving the camera (the camera moved in all directions along the horizontal plane); vertical movement included lifting the camera (the rising lens slowly rose from the flat shot to form a bird's eye view shot, and the descending lens was the opposite). In addition, there were revolving lenses that moved in a circular motion around the main body, as well as following lenses (the camera followed the subject of the motion, and the lens was divided into two directions: leading in front of the main body and following behind the main body). Different directions of motion had different effects, such as protruding the main body, increasing emotional appeal, and showing a sense of space. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Canon photography lens classification
Canon lenses are mainly divided into the following categories: 1. <EP lens: Including MP-E macro photography lens and ts-E shift-axis lens, suitable for use with the Eos series DSLR (full-frame, APS-C), and can also be transferred to the Eos M and Eos R series micro lenses.> 2. ESF-S lens: suitable for the APS-C format of the Eos series DSLR, can also be transferred to the Eos M, Eos R series micro lenses. 3. <strong></strong><strong></strong> 4. ESF-M lens: It is suitable for the Eos M series of micro lenses, not suitable for the Eos series of DSLR and Eos R series of micro lenses. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Canon lens ecological photography
Canon had a variety of lenses that could be used for ecological photography. For example, the EF28 - 300mm f/3.5 - 5.6L IS USM, EF800mm f/5.6L IS USM, EF400mm f/2.8L IS III USM, RF1200 fixed-focus lens, RF100 - 400mm F5.6 - 8 IS USM, etc. The EF28 - 300mm f/3.5 - 5.6L IS USM can be used in different shooting scenes with different apertures, shutter speeds and USB values for ecological photography. The EF800mm f/5.6L IS USM is suitable for shooting ecological objects that are far away, such as shooting birds such as black-necked cranes taking off. When the RF1200 fixed-focus lens was used to shoot birds, even if the subject was far away and looked like a point, it could complete the shooting task better. The RF100 - 400mm F5.6 - 8 IS USM lens was relatively light, about 635g. When paired with a body such as the Eos R6, the overall weight was also relatively light, making it easy to hold the ultra-long-range camera. Its focal length had obvious advantages when shooting wild birds in urban parks, gulls in the coastal intertidal zone, and other wild animals. It could easily achieve close-up shots and enrich the subject matter of photos during the journey. There were also highlights in macro shooting. The closest focusing distance at 200mm was about 0.88 meters, and at 400mm it was about 1.05 meters. The 400mm end had a 0.41x magnification, which would be a pleasant surprise for insects such as butterflies and dragonflies. The lens also had excellent anti-shake performance. When the light was not good, it could be used to shoot with a slower shutter. For example, when shooting the owl in the dark, it could be shot with a 1/80s shutter. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Canon lens shooting parameters
The common shooting parameters of Canon lenses were as follows: - ** Shot Type **: - "EP: Can be used with Canon's Canon's Canon 'Canon's Canon' Canon - ESF-S: Canon's APS-C frame single-lens reflex lens. It can't be directly installed on a full-frame single-lens reflex. It can be used on the eos-M series micro-lens and eos-R full-frame micro-lens through the transfer ring. - "ESF-M: Canon's Eos M series micro-lens. It cannot be used on other Canon cameras. - <<PR>: Canon's Eos R series full-frame micro-lens. It cannot be used on other Canon cameras. There were also MP-E (specialized for macro photography) and TS-E (electronic controlled shift lens), two special products. - ** focal length of lens **: A small number means a wide angle of view, and a large number means a good telescope. The focal length in the lens model is the physical focal length. For non-full frame cameras, you may need to consider the equivalent factor conversion according to the camera model. - ** Maximum Aperture **: For a zoom lens, if it is in the form of "f/2.8", it means that it is a constant aperture lens, and the entire focal length range can be set to this aperture; if it is similar to "f/3.5 - 5.6", it is a floating aperture lens, and its maximum aperture changes over the entire focal length range. - ** Lenses Grade **: L (Luxury) means Canon's high-end lenses, which are red circle lenses. These lenses usually have a red decorative ring at the front. - ** Image Stabilizer **: The IS (Image Stabilizer) logo indicates that the lens is equipped with Canon's unique image stabilizer, which can offset the image blurring caused by hand shaking within a certain range. It is commonly used in Canon's high-end professional lenses. - ** Focus motor **: - USM (Ultra-Sonic Motor): The lens using USM technology can achieve silent and fast-response autofocus. It is divided into three types: micro, ring, and NANO. - <strong></strong> - ** Other Marks **: - AL: It means that aspheric lenses are used in the lens design, which can reduce the number of lenses, reduce weight and volume, and provide better optical performance. It is used to solve the problems of glare and edge distortion in wide-angle and zoom lenses. It can also improve the optical quality of telephoto lenses. - DO: Lenses marked with this logo are equipped with multi-layer reflective lenses, which have the characteristics of fluorite and aspheric lenses. They are generally high-end lenses. - EMD: It means that the lens can open and close the aperture by electronic control. - Float: When the lens is used for close-up shooting, the lens will compensate for the aberrations at close range to obtain better image quality. - XP: The lens with this logo is a high-end professional lens. It has a focus presetting function that allows the lens to remember a certain focus distance. After setting it, it can automatically return to the set focus distance. It is also effective in manual focus mode. - FT - M: A lens with full-time manual function. You can manually adjust the focus of the lens in autofocus mode. - S-KD: It means that the lens uses S-KD glass lenses, and its optical performance is close to that of fluorite. The effect of an S-KD lens is equivalent to that of a fluorite lens. - KD: It means that the lens is made of KD glass lenses. The effect of two KD lenses is equivalent to that of a fluorite lens. - <MACRO>: This means that the lens has a strong close-up ability. - [DPS: A coating technology that optimized bokeh.] <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>