Optimizing Monitor Refresh Rate for Smooth Filming with 24 FPS
When it comes to filming at a frame rate of 24 FPS (frames per second) with a shutter speed of 1/50 second, a critical aspect to achieve a flicker-free and smooth video experience involves matching the monitor's refresh rate to the footage's frame rate.
Recommended Refresh Rates for Clear Vision
To minimize flickering, it's important to synchronize your monitor's refresh rate with the frame rate of your video. Here are the recommended refresh rates:
48 Hz
The optimal refresh rate for minimal flicker is 48 Hz. This is because 48 Hz is a multiple of 24 FPS (`24 fps x 2 48 Hz`). By displaying each frame twice, this method closely aligns with the shutter speed, effectively reducing flickering.
60 Hz and 72 Hz
If you don't have a 48 Hz monitor available, you can consider 60 Hz or 72 Hz monitors. While these refresh rates aren't as ideal as 48 Hz, they can still work well. The 72 Hz option is particularly useful as it is a multiple of 24 (`24 fps x 3 72 Hz`). However, it's generally more challenging to achieve perfect alignment with 60 or 72 Hz, which may result in some flickering.
Common Issues and Solutions
There are other factors that could exacerbate the flickering issue, such as the age of the display, the presence of multiple displays in the frame, and the variation in the voltage powering the display. Experimenting with different shutter speeds, adjusting ISO, or using ND filters can help mitigate these issues. Additionally, the choice of lighting can significantly affect the level of flicker; LED lighting sources are more likely to cause flickering, especially compared to traditional lighting setups.
Synchronization Tips
When all else fails, there are alternative methods to achieve a flicker-free video. One such method is to shoot a static shot using a blank screen as a mask, and then add the image in post-production. Another option is to invest in a camera like the Canon C100, which offers a 'clear scan' setting that allows you to incrementally match the shutter and refresh rates, ensuring optimal synchronization.
Consider Lower Refresh Rates
If you're working with motion picture cameras that use film, or digital video and analog video cameras with adjustable shutter speeds, you might consider monitors with lower refresh rates, such as 15KHz or below. Some older models of video cameras can be configured with higher refresh rates to better match the camera's shutter settings.
Remember that the true refresh rate may vary due to age and age-related changes in the display. Always experiment with different settings to find the best match for your specific setup.
Conclusion
Optimizing your monitor's refresh rate for smooth 24 FPS video at a shutter speed of 1/50 second is crucial for a flicker-free viewing experience. By understanding and implementing the recommended refresh rates, experimenting with various settings, and using modern technologies like the 'clear scan' feature, you can significantly improve the quality of your video content.