Viewfinder

The MAVIS viewfinder is very powerful. With support for focus peaking, zebras, false colour, guides and aspect overlays we were the first to provide access to professional high quality shooting assistants on the iPhone. With the launch of MAVIS 2 we added real-time image de-squeeze and image flip bringing support for hardware accessories such as the Anamorphic Moondog Lens and Beastgrip DOF adaptor.

 

Data Flow

The MAVIS data flow is different from other apps because of the way we have chosen to separate the viewfinder from the recording. This means that the image you see in the viewfinder can look very different from the one that is being recorded. This allows MAVIS to apply both image visualisations (e.g. focus peaking) and image warps (e.g. de-squeeze) without the recording being affected. See diagram below:

 

viewfinder_dataflow.jpg

 

Understanding the way we have structured the data flow in MAVIS is useful as the image captured by the recording may be different from image you see in the viewfinder. We have chosen to structure MAVIS in this way for two critical reasons:

(1) so we can apply image visualisations without them appearing on the final recording

(2) to allow final image warps to be done in post production

Warping images in real-time on an iPhone produces sub-standard results and, although it is acceptable for a viewfinder, we want to provide you with the best possible quality for your productions. To achieve this we only ever record the raw camera data provided by the hardware and iOS.

 

Image Warp Examples 

Beastgrip DOF Adaptor - The viewfinder flips the vertical and horizontal axes of the viewfinder.

viewfinder_beastgrip.jpg

 

Moondog Lens 2.4:1 - The viewfinder de-squeeze squashes the vertical axis of the viewfinder by 33%. With an input frame ratio of 16:9 (1.778:1) this results in output ratio of 2.4:1 with black bars across the top and bottom of the viewfinder.

viewfinder_moondog.jpg

 

 

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