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
The RED DSMC2 series cinema cameras require a special modified EF mount for RED cameras. It also interferes with the filter (OLPF) in front of the sensor, which must be removed.
Mounting on the Blackmagic URSA mini Pro
When mounting on the Blackmagic URSA mini 4.6K, you will need to use the EF-Mount and remove the IR cut filter in front of the sensor.
The HAL 250 4.3 and HAL 200 6.0 can be mounted on the Blackmagic Pocket Cinema Camera, but the HAL 250 6.0 and HAL 200 5.0 cannot be mounted.
Materials
How to take off the RED DSMC2 OLPF
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 |
Blackmagicdesign URSA
