| | Prof.
Could you explain what a Mk.3+C is for those who are not familiar with your lenses..
Sure. In its most simple terms, the CAVX Corrector is a cylindrical (it has to be such to prevent the height from changing) lens that assists with the focus of the vertical lines.
All HE anamorphic lenses naturally pass the horizontal lines. This is because their vertical magnification power is 0.00x. Horizontally, the HE lens is designed to magnify the image, so as a result, the vertical lines tend to be affected. In video, horizontal lines are actually the vertical rez and vertical lines are actually the horizontal rez. Therefore each pixel is affected to a degree. Top/bottom is unaffected, left and right sides become blurred.
The MK4 has lenses that can focus light in both the H and V direction at the same time. The key is to find the exact air gap between these lenses to make an infinite focal point. Once found, the lens passes both H and V lines and why the images created by this lens are so sharp.
Prisms on the other hand can only focus in one direction at one time. As mentioned above, typically H lines are unaffected. However because V lines are, we tend to rock the focus to bring both into a more uniform form of focus. In other words, we de-focus the H to bring the V more into focus.
So by adding a focal element, we can have a better overall image. The additional lens is designed to do the work the prisms can't.
The limit is that the corrective lens is a single lens and has no other lens to work with, hence it has a sweet spot and if your in the sweet spot, all good and if your not, then the lens may cause the image to worse than without.
As the image shows, my correction lens sits behind the prism pair.