Diameter of the lens bottom and distance of the back focus
| Lens | A | B |
| HAL 250 4.3 | 29mm | 14.9mm |
| HAL 250 6.0 | 36mm | 17.78mm |
| HAL 200 6.0 | 29mm | 15.73mm |
Since the Entaniya Fisheye HAL EF mount lens is designed for mirrorless cameras with EF mount specifications, the distance from the bottom of the lens to the sensor (flange back) is shorter than that of a normal EF mount lens.
Precautions for using EF mount lenses
Cannot be used with DSLR cameras
The rear of the lens must be inserted inside the camera to mount the lens, and cannot be used with DSLR（SLR） cameras with mirrors.
Mounting on the RED DSMC2 series cinema cameras
It cannot be mounted on the RED DSMC2 cinema camera because it interferes with the OLPF inside the camera.
Mounting on the Blackmagic URSA mini
It cannot be installed on the Blackmagic URSA mini series because it interferes with the OLPF inside the Blackmagic URSA mini series.
HAL 250 4.3 and HAL 200 6.0 can be installed on Blackmagic Pocket Cinema Camera, but HAL 250 6.0 and HAL 200 5.0 cannot be installed.
Entaniya EF Mount Adapter for RED DSMC2
| Price | 50,000JPY（Tax-exclusive） |
| Model Number | RED-MP |
Entaniya OLPF for RED DSMC2
| Price | 50,000JPY（Tax-exclusive） |
| Model Number | RED-OLPF |