The anamorphic adapter attaches to the main receiving lens (your lens) and compresses the image.
Focusing is carried out by the main lens, the adapter has a single through focus.
The adapter is capable of focusing on lenses from 20 mm to 85 mm and has a mounting diameter of 67 mm. The adapter is attached to the main lens directly, or through a special clamping device (clamp) designed to align the adapter horizontally. The clamp is sold separately and is made in a simple ring design with external and internal threads and can be fixed in the desired position using adjustable or hidden bolts.
The anamorphic adapter can be installed on any lens with different diameters using adapter rings up to 67 mm (the diameter of the anamorphic adapter attachment). It is desirable that the diameter of the front lens of the receiving lens is less than 60 mm. If it is larger, vignetting and spherical aberrations may occur.
lenses with the best sharpness are 37mm f2.8, 40mm f2.8, 45mm f2.8, 50mm f2, 55mm f2. 58mm f2.8.
The anamorphic adapter works with zoom lenses. For zoom lenses, the values may differ, and vignetting may occur at a slightly longer focal length. If the front filter of your lens rotates, then you will have to install the anamorphic adapter on the rig (cage) next to the lens. The anamorphic adapter must not rotate during shooting, otherwise the horizontal compression ratio will change.
It is necessary to use very sharp lenses – anamorphic adapter significantly reduces the depth of field (harder to focus), slightly blurs the image, blurs at the edges.
Budget versions (Budget) anamorphic adapters are more suitable for artistic photography. They have a little more distortion. For the MFT camera (crop 2, micro 4/3), the Compact anamorphic adapter is better. Bigmetal series adapters are better suited for full-frame cameras. The APS-C (crop 1.5) format is universal for anamorphic photography.