Why is my Canon 70D Live View Autofocus Worse? Debunking Common Myths
Live view autofocus on your Canon 70D is designed to be more accurate than the viewfinder autofocus, contrary to some beliefs. Understanding the technology behind this feature and how to use it properly can enhance your photography experience. This article aims to clarify common misconceptions and provide valuable insights into effective Live View autofocus usage.
Understanding Canon 70D Autofocus Technology
Is the Canon 70D's Live View Autofocus Inaccurate?
Contrary to what some commenters might suggest, the Canon 70D does not employ contrast detect autofocus in its Live View mode. Instead, it utilizes phase detect autofocus, similar to what is found in its viewfinder. However, the distinction lies in the operation and stability of the camera in Live View mode.
The 70D introduces the innovative dual-pixel autofocus technology, wherein each photosite on the main sensor, except for its outermost edges, is divided into two parts with different orientations. These dual pixels work together to provide phase detect autofocus, a significant advancement in focusing technology.
Advantages of Dual-Pixel Autofocus
Why is Live View autofocus with the 70D considered to be more accurate than viewfinder autofocus? This is primarily due to the positioning of the autofocus sensors. Unlike viewfinder autofocus, which relies on sensors located at a different distance from the lens to the focal plane, Live View autofocus performs focusing using the actual imaging sensor at the focal plane.
The difference in these positions can lead to inaccuracies in viewfinder autofocus, as the distance from the focusing cell to the lens is often markedly different from the focal plane distance. This is why professional and enthusiast cameras include Autofocus Microadjustment features to fine-tune the viewfinder autofocus, compensating for the specific lens being used and even the different ends of the zoom range on zoom lenses.
With Live View autofocus, focusing at the focal plane with the actual sensor cells that take the picture negates the need for such adjustments. This means that if you are using the Live View mode, you should experience faster and more accurate autofocus, making it a preferred choice for many photographers.
Stability and Holding Technique
One factor often overlooked is the stability of the camera when using Live View autofocus. Holding the camera steady is crucial for accurate focusing, especially in low-light conditions or when taking a series of shots.
Some users find that holding the camera against their head while using Live View autofocus provides better stability compared to handheld shooting. However, this method may not be ideal for all situations. To enhance stability, especially when using Live View, consider using the strap to add tension. The added support and balance can significantly improve the accuracy of your autofocus and the overall quality of your images.
Conclusion
The rumors and misunderstandings about the Canon 70D's Live View autofocus accuracy can be dispelled by understanding the technology behind it. The 70D's dual-pixel autofocus system offers both speed and precision, making it a powerful tool for photographers. By leveraging these features effectively, you can take advantage of the vast potential of your Canon 70D's Live View autofocus system.
Whether you are a beginner or an experienced photographer, mastering Live View autofocus can lead to improved image quality and a more efficient shooting process. So, ditch the old myths and embrace the advanced focusing technology of your Canon 70D!