Sean_Conley Before we draw any conclusions, it’s interesting to note that the 32mm lens surprisingly offers greater coverage compared to the 28mm, while the 50mm exhibits less coverage than the 40mm. However, it’s not always a straightforward comparison, as these lenses incorporate a kind of speed booster and extender design. They essentially utilize multiple base lenses, extending and reducing from there, making it quite an intriguing series. Please note than when focusing to infinity a lens is moved forwards and thus the lens is further away from the sensor and the image circle will be extended, this is called breathing, a lens in close focus will therefor have better coverage opposed to being focused at infinity. Some lenses have less breathing or non at all this is not the case for Ultra Primes. If you stay in the 1-10m focusing range you will have very little vignetting, but if you do some shots at infinity you will notice more vingetting. we suggest a 5% frameline scale, to counteract any possible vignetting on these lenses. You will be fine!
I generated coverage plots of these lenses using the Arri illumination tool. The Alexa LF, with a width of 36.7mm, is nearly identical to the Mavo Edge, with the Alexa LF being just 1.94% larger. In my view, there’s little need to repeat these tests as they were conducted excellently. Below, you’ll find the results. All tests were conducted with the lenses wide open. It’s worth noting that vignetting will be less pronounced when slightly stopping down, and Kinefinity sensors are marginally smaller.
To address any vignetting concerns, shooting in 4K (lf) or 6K DCI (same frame size) and adding frame lines, scaled down by approximately 5%, should suffice. The new firmware from Kinefinity, which I am currently evaluating, includes a feature to adjust frame lines and blank out space accordingly. By cropping in 5%, all lenses should perform adequately. Indeed, the 32mm lens matches the 40mm, making the latter a suitable reference for the former.
