Distance is listed in our specifications and foldout brochure. Most prisms are rated at F1.4 or F1.6. Many of our zooms have a maximum aperture of 1.0 or 1.2. Picture will be normal when lens is at or below the prism F-number. Depending on camera, auto-iris output may not be compatible with our MEA lenses.
Camera has no backfocus adjustment.
Panasonic requires 3.5mm or less. KYF55 M version zooms are compatible. MEA versions are not due to incompatibility with camera auto-iris output.