After a couple weeks of testing the prototype 50D VAF the one thing that stands out the most about this filter is the ability to push the RAW image in post. When aliasing and moiré occurs in your footage the post-production color correction process has a limitation. That is why I decided to acquire a VAF from Mosaic Engineering. Interestingly, what I wasn't expecting to come about, at least so dramatically, was the range of colors that the 50D could handle with the VAF in place.
The 50D aliasing issue causes post-production color correction limitations. It's a factor that must be configured into the color correction process. However, with the limitation seemingly removed, especially during close-ups & mid shots, the images derived from the 50D become far more capable in post-production processes.
For example, when color correcting footage without the VAF I find that my scopes rest in the 50 - 70% legal television chroma-value range before the image proves qualities of aliasing, moiré, and false color. With the VAF in place I regular find myself beyond television chroma-value limits and the image appears to want to go even further without breakdowns in skin tones and other artifacts. This is a very positive attribute that is only derived from a camera that has a lot of flexibility. So as a result, you know, the prototype 50D VAF is proving very valuable to the workflow.
Not to say that everything is totally perfect. There are some additional issues with the filter that need to be addressed. Currently, parfocal lensing is not possible. The VAF negates the user's ability to zoom in on a subject, adjust focus, zoom out from the subject and maintain focus throughout the entire focal distance. However, that is not an issue with prime lensing. I am currently in the process of speaking with Mosaic Engineering to address the filter's performance.
If you follow the link you will be directed to download sample DNG images as well as video footage. You'll notice that the filter eliminates about 85 - 90 percent of the moiré and aliasing in the chroma channels. The luma channels appear to hold aliasing and moiré but the percentage is about 93 - 97 percent eliminated.
https://copy.com/IOqlwsmWUi8iSo what do you think? Would 92 - 100 percent moiré elimination actually take away from detail & texture? Is 100% moiré and aliasing elimination a better solution because the shooter would never have to worry about when and when not to use filters to block moiré and aliasing? Or, would you prefer more texture and detail with the chance of moiré and aliasing in the image?
More or less that is what I'm thinking about the filter right now. The right thing to do will be to post another response after addressing this with Mosaic Engineering. I presume we all want to know just how much of an impact the VAF can make, right? Until then, thanks for reading and enjoy your time.
