ALF-25X-4KNDI with NDI®|HX3

The ALF-25X-4KNDI with NDI®|HX3 is a 4K PTZ camera equipped with a 25x Zoom Lens, HDMI, SDI, NDI®|HX3 and USB connectivity. Featuring all new AI-powered Auto Tracking technology.


25X-4KNDI with NDI®|HX3

The JOSAWA ALF-25X-4KCAM is a 4K PTZ camera equipped with a 25x Zoom Lens and features an all new advanced high speed processor with AI Powered Auto Tracking and NDI®|HX3. This PTZ camera is suitable for medium to large-sized meeting rooms, boardrooms, conference venues and houses of worship. Alfatron 25X-4KCAM is compatible with video meeting software, such as Zoom and Teams.



  • 4K UHD Resolution: SONY CMOS sensor. Resolution is up to 4K with a frame rate up to 60fps. 
  • Dual Stream Output: USB supports the main stream and sub stream output simultaneously, and meets the needs of near-end and far-end. 
  • Optical Zoom Lens: 25X optical zoom lens and 59.2° wide angle lens. 
  • Interfaces: Supports HDMI, USB 2.0, SDI, LAN,NDI®|HX3 and outputs 4K audio and video simultaneously. 
  • Leading Auto Focus Technology: Fast, accurate, and stable auto focusing technology. 
  • AI Powered Auto Tracking: Built in high speed processor and advanced image processing and analysis algorithm, and real-time tracking and zone tracking modes are available.
  • Low Noise and High SNR: Super high SNR image is achieved with low noise CMOS. Advanced 2D/3D noise reduction technology further reduces the noise while ensuring high image clarity. 
  • Multiple Audio / Video Compression Standards: LAN interface supports H.264/H.265 video compression, USB3.0 interface supports MJPG, H264, YUY2, NV12, H265; A-IN interface supports AAC, MP3, G.711A audio compression coding 
  • Audio input interface: 8000, 16000, 32000, 44100, and 48000 sampling frequency. Supports AAC, MP3 and G.711A audio compression 
  • Multiple Network Protocols: Supports ONVIF, GB/T28181, RTSP, RTMP protocols; Supports RTMP push mode, easy connection to streaming server (Wowza, FMS); Supports RTP multicast mode; Supports full network command VISCA control protocol. 
  • Control Interface: RS422 input (compatible with RS485), RS232 input/output, RS232 (cascade connection)
  • Multiple Control Protocol: Supports VISCA, PELCO-D, and PELCO-P protocols; Supports automatic identification protocols. 
  • Multiple presets: Up to 255 presets (10 presets via remote control).
  • Multiple Application: Online-education, Lecture Capture, Webcasting, Video conferencing, Tele- medicine, Unified Communication, Emergency command and control systems, etc.
  • Available in Silver and Black




Camera Parameters
Optical Zoom  25X f=7.1 mm 175.11 mm ±5% 
Field of View


2.5˚(Tele)~ 59.2˚(Wide) 

1.4˚(Tele)~ 34.6(Wide)

AV  F1.61(Wide) F5.15(Tele) ±5% 
Sensor  1/1.8 inch SONY CMOS sensor 
AI-powered Auto Tracking modes:
Real-time Tracking: Real time tracking supports tracking at a distance up to 23ft / 7m
Zone Tracking:
4 tracking zones can be set within -110° to +110° on the horizontal plane and -30° to +30° in the vertical plane.
Effective Pixels  8.51M megapixel 16:9 
  HDMI: 3840*2160P60 / 50 / 25 / 59.94 / 29.97; 1080P60 / 50 / 25 / 59.94 / 29.97; 1080I60 / 50 / 59.94; 1080P@30fps, 720P@60fps, 720P@50fps, 720P60 / 50 / 59.94 
  SDI: 1080P60 / 50 / 25 / 59.94 / 29.97; 1080I60 / 50 / 59.94; 1080P@30fps, 720P@60fps,  
  720P@50fps, 720P60 / 50 / 59.94 
  MJPG:1920*1080 / 1600*896 / 1280*720 / 1024*576 / 960*540 / 800*600 / 800*448 

/ 720*576 / 720*480 / 640*480 / 640*360 / 480*270 / 352*288 / 320*240P60 / 50 / 30 / 25; 3840*2160P30  

Video Format  H264:1920*1080 / 1600*896 / 1280*720 / 1024*576 / 960*540 / 800*600 / 800*448 / 

720*576 / 720*480 / 640*480 / 640*360 / 480*270 / 352*288 / 320*240P60 / 50 / 30 / 25 3840*2160P30 

  YUY2:640*480 /640*360 /480*270 /320*180P30/25 
  NV12:640*480 /640*360 /480*270 /320*180P30/25 
Minimum Illumination  0.5 Lux (F1.8, AGC ON) 
White Balance  Auto / Manual / One Push / Specified Temperature 
Focus  Auto / Manual / One Push Focus 
Exposure Mode  Auto / Manual / Shutter priority / Aperture priority / brightness priority 
Aperture  F1.8 F11 CLOSE 
Shutter Speed  1/251/10000 
WDR  OFF / Dynamic level adjustment 
Video Adjustment  Brightness, Color, Saturation, Contrast, Sharpness, B/W mode, Gamma curve 
SNR  ≥50dB 
Video Interfaces  HDMI, SDI, LAN (Support POE), NDI®|HX3
USB 2.0, A-IN, RS232-IN, RS232 OUT, RS422 (Compatible with RS485) Rotary DIP switch, DC12V Power Supply, Power Switch 
Video Compression Format  LAN Interface: H.264, H.265 

USB 2.0 Interface: MJPG, H264, YUY2, NV12 

Audio Input Interface  Double track 3.5mm linear input 
Audio Output Interface  HDMI, LAN, USB 2.0, SDI
Audio Compression Format   

AAC, MP3, G.711A 

Network Interface  10M / 100M / 1000M adaptive Ethernet port, supports POE power supply, supports audio and video output 
Network Protocols  RTSP, RTMP, ONVIF, GB/T28181; Network VISCA control protocol: Supports remote upgrade, reboot and reset 
Control Interface  RS232-IN, RS232-OUT, RS422 compatible with RS485 
Serial Communication protocols
VISCA / Pelco-D / Pelco-P 

Baud Rate: 115200 / 38400 / 9600 / 4800 / 2400 

USB Communication Protocols
UVC (Video), UAC (Audio) 








Technical Sheet

User Manual

Streaming setup Guide

Firmware Download

Latest Firmware – File Download here

Network Upgrade Instructions

1. Connect the camera to the computer on the same LAN; open your browser and input the default
IP address:, The user name: admin and password: admin.

2. Click “configuration” after you have logged in.

3. Click system configuration, then version update, then browse the updated file, and then click to update. After update has been completed, the camera will restart automatically.

4. After the camera has restarted, log in and check whether it has upgraded to the new version.


Wall or Ceiling Mount Bracket