Sony’s introductory video explaining the unique features of their Electronic Variable ND filter on the FS7 II, FS5, and X180 / X160 cameras.
There are five different user benefits that we are going to touch upon in a series of five video clips.
1. What is “Electronic Variable ND Filter” ?
2. How does it work? (Seamless Exposure Control)
3. Seamless Depth-Of-Field Control while Filming
4. Benefits when using thrid party lenses
5. Use the Best Iris Range
[Details of video #5]
Have you ever heard or seen about the resolution loss effect when closing the iris? It is caused by diffraction, a basic aspect of light theory. As the iris is closed, the light path is narrowed which results in diffraction and an inevitable loss of resolution. To avoid resolution loss due to diffraction, you have to keep aperture reasonably open and keep the light path at certain level.The Electronic Valuable ND Filter can help with this, seamlessly changing the filter density to provide the best exposure while still keeping the iris open.
So the Electronic Variable ND filter not only offers an excellent way of controlling exposure, but also maintaining a nice, sharp image.