How to use a spherical movie camera?

How is the 360-degree screen movie shown?

The place where the screen movie is shown is called the screen theater. The audience hall of the theater is dome-shaped and the screen is hemispherical. The audience lies flat on the seat at the bottom of the screen, or sits on a dynamic seat with special functions. Looking up, the whole movie picture is covered by a spherical screen, like a sky, which covers the line of sight of all the audience and ignores the edge of the screen. The film is shot and projected with a super wide-angle fisheye lens, which has a very strong naked-eye 3D visual effect, as if being in a movie scene. Six-channel stereo effect perfectly restores the auditory effect of real life.

Lead: a guide to the use of BMPC for film-grade cameras. After listening to my introduction, do you have a clearer understanding? I hope you can enjoy the article!

BMPC movie camera user guide

▲ Press and hold the power button to turn on the machine. Besides the screen, there are some basic information on the display screen, such as histogram, sound level and some basic settings of the machine. Click the menu button to enter the menu setting interface. There are some settings to choose from in the menu: slate information, camera settings, formatted hard disk, focus assist and oscilloscope display security box.

▲ Click on the field comment information to enter the interface. In this interface, there are some basic field notes for us to write, such as project name, number of times, number of shots, shooting angle and so on. In the middle of these messages, there will be a symbol of circle A, which means automatic counting. When you click Open, it will automatically turn yellow. At this time, the number of shots and shooting times will be automatically recorded.

▲ In Sellings settings, you can set the name of the machine, namely the CameraID. This ID can be as short as possible, or it can be left blank, which directly affects the file name saved later. If it is too long, it will be difficult to manage. The time and date of the camera should be correct, otherwise the later personnel will be confused. There are also some basic settings, such as ISO sensitivity, white balance and ShutterAngle.

▲ Shutter angle is actually the concept of film camera. There is a white baffle with an open corner in the video picture. This baffle is the device that controls the shutter on the film camera, commonly known as the blade. When the video starts, the blinds will keep rotating. When the light entrance is blocked, the film will be sent to the light entrance. When the film is fixed at the light entrance, the opening angle of the shutter just passes through the film to expose the film, so the larger the opening angle of the shutter, the longer the exposure time.

▲ According to a formula, it can be calculated that the exposure time or shutter speed is equal to the frame rate multiplied by 360 divided by the shutter angle.

▲ For example, if you take a 24-frame photo, multiply 24 by 360 and then divide it by the shutter angle 180, and the shutter speed or exposure time is 48, that is, 48th of a second. BMPC uses shutter angle parameters and global electronic shutter to solve the jelly effect. The traditional electronic exposure is line-by-line pixel exposure, and the time difference between pixel exposure modes is short, but the global electronic shutter can solve this problem well. Its exposure mode is that all pixels are exposed collectively at the same time to ensure the stability of the picture.

▲ Recording settings, adjustment of recording format, dynamic range and frame rate, and shooting delay. The highest quality recording format is 4KRaw, and the dynamic range is Film by default. Raw format, unprocessed, records the original information of digital camera sensors, and records the metadata files generated by machine shooting, such as ISO, shutter angle, aperture, white balance, etc.

▲ You can also shoot ProResHQ and ProRes422 with 4K resolution, or you can shoot the video of 1080, just choose ProRes format without 4K label.

▲ Dynamic range, the camera's ability to distinguish from the darkest to the brightest. The larger the range, the more gray details there are in the middle transition. The machine provides two dynamic ranges: one is Flim mode, and the gear tolerance of 12 is obtained by 4KRaw, and the other is matched with the color matching of Leonardo da Vinci, which makes the picture more cinematic. The other is video mode, which is not so tolerant. Projects with tight production cycle have no color matching time, which can be well solved.

▲ Note: Except 4K Raw can be shot in Flim mode, other formats can also be shot in Film mode. However, the dynamic range of movie mode is not so high, and it can't reach 12. If the colors are matched properly, the effect is good. BMPC can also delay shooting, and you can choose to shoot every two frames, every second, every minute and so on.

▲ Display menu and display screen settings also have dynamic range, with video and movie modes. This setting can adjust zebra stripes to see if the area is overexposed. I have a little trick to share with you. When shooting in 4KRaw format, ISO is generally set to 400 to ensure its maximum tolerance, and then the range of zebra stripes is expanded to 100%. At this time, shoot. As long as there are no zebra stripes in the picture, even if the picture seen through the monitor is exposed again, it can be adjusted back by software later. This is the possibilities brought by Raw and tolerance to the later period.

▲ Due to the pressure and heavy workload in the later period, I chose to format the hard disk into HFS+ format, which is unique to Apple; Both Apple and PC systems support ExFAT format, which can be formatted as needed. Next, FocusPeaking has the same function as the focus button on the fuselage. Click it to view the peak of focus in real time when shooting, and the green line in the picture is the peak of focus.

▲BMPC adopts S35 photosensitive element size, and the lens conversion coefficient is 1.7. Superoxygen officially presented a three-yang lens set with the resolution of 3. 1T of 14, 2.2T of 16 and 1.5T of 24.

▲ Note that the concepts of T and F are two different aperture systems. T stands for exposure series and f stands for aperture value. The difference is that t is more accurate than F. ..

▲ When considering changing lenses, if the amount of light entering the two lenses is different, it will cause unfavorable factors to the picture. In fact, except for 14 and 16, 24 is not so perfect in the coefficient of 1.7. Multiplied by 1.7, the focal length is only 40.8. If 24 is replaced by 28, it will be closer to 50.

▲ If you need to use a large aperture during the day, but you can't make the picture explode, the only way is to add a NDFILTER in front of the lens, which is the ND filter, to reduce the light of the picture. For example, ND0.9 filter can reduce the existing aperture value by three exposures, ND 1.2 by four exposures, and ND 1.8 by six exposures. PL polarizing filter can eliminate the light reflected by the mirror by adjusting the angle.

▲ In addition to the advantages, there is of course a small defect. For example, after shooting the material, if you have a general view of the material, it will be more troublesome, because it has no thumbnails and no list-based material arrangement, so you can only view it one by one, which is very inefficient.

How to use the camera

First, stabilize the machine.

1. It is best to hold the camera with both hands, which is definitely more stable than one hand, or use something that can be supported by you or prepare a camera tripod. In any case, it is to minimize the shaking of the picture, and it is the most taboo to shoot while walking, which is also the most common mistake. This shooting method is only used under special circumstances. It must be remembered that the stability of the picture is the first requirement of dynamic photography.

2. Keeping the picture stable is the most basic and important requirement for shooting. Whether it is pushing, pulling, shaking, moving, leaning, tilting, zooming, etc. We always work around how to keep the picture stable. The main factor affecting the stability of the picture comes from the stability of the photographer. Mastering the correct method of holding a camera is a basic skill for every photographer. Only with excellent basic skills can you operate freely when shooting and shoot high-level video works.

02

Second, fix the lens.

1. Simply put, after the lens is aimed at the target, shoot at a fixed point, instead of zooming in and out or sweeping up, down, left and right, set the screen size and start recording. Usually, the fixed lens is the main shooting mode, and there is no need to do too much zoom action, so as not to affect the stability and change of the picture, that is, the size and depth of field of the scene are changed by the difference of the viewing size or angle and position.

2. To put it simply, when shooting a panorama, the camera leans back a little, and when you want to shoot a part, the camera leans forward a little. If the position changes, such as the side, height and lower position, the effect will be different and the picture will be richer. If you can't get close because of the venue, of course, you can use the zoom lens to adjust the picture to the size you want, and the adjustment range can be slightly smaller.

3. But remember not to stand at a fixed point and zoom in and out with a zoom lens, which is a common problem for many V8 people. Using more fixed lenses when shooting can increase the stability of the picture. When shooting one picture at a time, connect pictures of different sizes and make the pictures bigger and smaller with less zoom. Unless you fix them with a tripod, long-distance zooming will definitely lead to picture jitter.

03

Third, shooting skills

1. I believe you have also encountered a picture that can't take a panoramic view of the scene. At this time, everyone must scan the camera from right to left or from left to right, which is also one of the advantages of the camera. But when many people do this action, the picture often swings from side to side or is fast and slow, in short, it looks very unsmooth. These problems mainly occur in the wrong way of body rotation, or the rotation angle is too large, which leads to hesitation and cannot be achieved overnight.

2. The correct way is to take the waist as the dividing point, with the lower body motionless and the upper body moving. Just like when you want to cross the road, look around to see if there is a car coming. It is reasonable to turn your head left and right below your shoulders. For example, if you want to shoot a scene, you need to scan from point A to point B. First, turn your body to point B, and then turn your upper body to point A. At this time, the camera is facing the direction of point A, and then press the video button to place it first.

What is a curtain movie?

Question 1: What's the difference between the Dome Theater and IMAX? The curtain of the Dome Theater covers the whole viewing seat in an arc shape, and the seat has a certain inclination angle, so you can get a good viewing effect no matter where you sit. The effect of IMAX is not much to say. Now many IMAX theaters know it at a glance.

Question 2: What is the dome film and its principle? Dome movies are also called "dome movies" or "dome movies". The shooting and projection adopts super wide-angle fisheye lens, the audience hall is dome-shaped structure, and the screen is hemispherical. The audience can sit on the recliner and watch, and the screen is like the sky. Because the screen image is large and clear, extending from the front to the back of the audience, accompanied by stereo surround sound, the audience feels very immersive.

Question 3: What is the principle of dome membrane? Image maximum's screen is huge, and the video resolution is above 4K, so the audience is immersed in the screen, just like being there.

Question 4: Introduction to the Spherical Screen Movie The dynamic spherical screen movie hall uses 70mm projection equipment, and the diameter of the hemispherical screen is 18m. When the audience watches a movie, the whole picture is covered by a sphere, but the edge of the screen can't be seen. The transmissive metal screen and six-channel stereo effect enable the audience to enjoy the changeable and vivid weather. The dynamic platform in the cinema is a high-tech system engineering integrating hydraulic pressure, electrical automation control and computer animation. When you sit on the platform carrier, the whole carrier can rise and fall, tilt left and right, and pitch back and forth, so you can simulate a spaceship inviting you to visit space, or a submersible enjoying the strange sight of the underwater world. With the vivid pictures and the activities of the platform carrier, people can't help but enter the role and produce a very real and thrilling special feeling. Dome film is a kind of film with dome screen, also called "dome screen film". Its dome-shaped screen develops to the limit of widescreen and then to the sky. Covered the audience like a big iron pot. This dome-shaped screen was originally semi-domed. 1939, at an Expo held in new york, people used five projectors to project a huge composite picture on a dome-shaped screen. People who watched this kind of film at that time were amazed. In World War II, some countries once projected the images of enemy planes on this dome screen for air defense training. It only developed into a full dome shape in the 1970s, and dome films mostly used single-lens shooting and single-lens projection. A 65mm or 35mm camera with fisheye lens is used for shooting, and a 70mm projector with fisheye lens is generally used for projection. There is a cinema dedicated to showing this kind of film. The screen is dome-shaped, with a diameter of 25m and a height of about 18m, extending to the back of the entire auditorium, as if a huge dome were on the ground. The audience went to the ball to see the movie through a special tunnel. On this strange screen, movies about interstellar travel and Apollo spacecraft landing on the moon have been shown, and the effect is particularly good. There are several domed cinemas in China, the most representative of which is the Domed Cinema of China Science and Technology Museum, which was completed in August, 1995 with a screen diameter of 27 meters and 500 seats. Movies that have been released include American 70mm movies "The Grand Canyon" and "Flying into Space".

Question 5: What's the difference between the Dome Theater and the Ball Theater? Dome film is a kind of film with dome screen, also called "dome screen film". Its dome-shaped screen develops to the limit of widescreen and then to the sky. Covered the audience like a big iron pot. The movie screen is hemispherical, which extends from the front to the back of the audience. The audience lay on their backs in their seats as if they were there. Not only does the front object seem to have reached out and taken it away, but some objects behind it also feel moved. The shooting and projection all adopt super wide-angle fisheye lens, and the screen image is large and clear, extending from the front to the back of the audience, accompanied by stereo surround sound, as if you were in it.

Question 6: The Dome Theater of China New Science and Technology Museum, the largest dome cinema in the world, officially opened its doors to welcome guests. In the cinema, the audience can feel the circular audio-visual effect of looking up and looking around the screen. Sitting in a chair with an inclination of 30 degrees, you can see a huge circular screen when you look up, bringing all the scenery in the film to your eyes, as if you can reach out and touch it. According to the relevant person in charge of China New Science and Technology Museum, the dome theater of the Science and Technology Museum shows dome movies and celestial phenomena, which can accommodate 442 spectators. The cinema has introduced the world's advanced IMAX projection equipment, and the film screen area exceeds 1 000 square meters, which has brought unprecedented visual impact to the audience. "This is the largest dome theater in the world at present. It is understood that the Universal Theater of the Science and Technology Museum has introduced films such as "There is a hole in the sky" and "Alps", which will be open to the public from now on. Adult ticket price of Globe Theatre is 30 yuan, and student is 20 yuan.

Question 7: What movies are there in the new China Science and Technology Museum, Anna karenin?

6.9

Plot/love/ethics

Year: 20 13

Region: Europe and America

Actors: santiago cabrera Benjamin Sadler, Vittoria Puccini

Director: Christian Dugui

Question 8: Excuse me, what's the difference between 3D, 4D and Dome movies? Needless to say, wearing red, blue or polarizer to watch "4D" is to show you some effects other than movies in 3D, such as blowing wind and spraying some water ~ ~

You don't need glasses to watch a curtain movie. Your seat is around the center of the ball, so the screen looks super three-dimensional, just like 3d, the chair should be the kind that moves, with a strong sense of space and suspension ~

I feel that if there is a good film with a curtain, of course, the curtain is more cool! I don't feel so dizzy without glasses (but I don't know what movie can be made into a curtain). The second is to look at the 3d of IMAX, which has a huge screen and good stereoscopic effect. Ordinary 3D effect is really ordinary ~ ~ ~ (personal opinion)

As for the homework of farmers, I really won't "pass by" and I'm not familiar with it ~ ~

Question 9: Excuse me, what's the difference between 3D, 4D and Dome movies? 3D movies are relative to traditional 2D movies. 2D film imaging is flat. For example, the current TV is 2D, and closing one eye is the same as opening both eyes. 3D film imaging is stereoscopic and requires glasses. Closing one eye is different from opening two eyes.

A 4D movie is an extension of a 3D movie, and its imaging is the same as that of a 3D movie, that is, it is visually the same as that of a 3D movie. But it adds a fourth dimension, namely human feelings. The chairs in the 4D cinema can be moved, and when the movie is played, it will give viewers a four-dimensional sense of touch and smell, just like airflow and smell.

Ball-screen movies are relative to plane movies. The screen is a dome-shaped ball screen above people's heads, not a flat screen in front of traditional movies.

Question 10: What is the full name of the dome movie in Dongguan Science and Technology Museum? I come from Mianyang and have only been to Mianyang. They are all science and education films. Cosmic exploration, Pharaoh's star, fantasy of the future, micro-human world and so on. The time is about 20-30 minutes (because it is too real, you will feel dizzy if you watch it for too long. ) the effect is very good. Super realistic. . If you press 100, I will give you 95 points! .