BMPC movie camera user guide

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's 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, that is, the camera ID. 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 taking pictures should be correct, otherwise the later personnel will be confused. There are also some basic settings, such as ISO sensitivity, white balance and shutter angle.

▲ 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 divide it by the shutter angle 180? You get a shutter speed or exposure time of 48, that is, 48 minutes 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 4K raw data, 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.

▲ ProRes HQ and ProRes422 can also shoot 4K resolution and 1080 video. 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 4K Raw, 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 light input of 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 an ND filter in front of the lens, that is, an 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.