# Lens numbering # Lens numbering ll [lenses on Kurokesu web page](https://www.kurokesu.com/shop/lenses) has unified numbering. After few years of testing different naming conventions, this one seems to be finally working fine. Main purpose was to make it clear what kind of lens it is from a glance and have distinct SKU. It may not reflect full information though as overpopulating with extra information would make it even more difficult to read.
**L** | **001** | **FZA** | **-** | **2.8Z12** | **-** | **CS** | **-** | **VIS** |
Lens | ID | Features | Zoom range | Lens mount | Filter | |||
**M** - Motorized lens **Z** - Zoom **F** - Focus **A** - Aperture **D** - Day/Night | **NN** - Fixed **NNZMM** - Zoom | **N** - No lens mount **C** - C-mount **CS** - CS-mount **M12** - M12-Mount (S-Mount) **M16** - M16 lens mount **M8** - M8-mount **D14** - D14-mount | **VIS** - Band Pass 380-650nm (IRCUT) **NF** - No filter **NIR1** - Long pass 850nm filter |
If no filter specified for CS or C-mount lenses, assume **NF** lens option.
If no filter specified for M12-mount lenses, assume **VIS** lens option.
#### Examples**Lens SKU** | **Explanation** |
L010-3.2-M12 | M12 lens, focal distance 3.2mm, IRCUT filter |
L010-ZFA-2.8Z12-CS | CS zoom lens, focal distance 2.8-12mm, no filter |
L010-MZFAD-5Z50-D14 | Motorized 5-50mm D14 lens with zoom, focus, aperture and day/night selection mode |
L010-3.2-M12-NF | M12 lens, focal distance 3.2mm, no filter |