Description
The Alphatron Broadcast Electronics EVF-035W-3G Electronic Viewfinder features a 3.54″ LED-backlit LCD and displays 24-bit RGB at 960 x 640 resolution in a 16:9 aspect ratio. Brightness is at 500 nit and contrast ratio at 1000:1. The viewing angle is 160 x 160°. The unit comes equipped with an adjustable diopter and a manual lens shutter for protection of the LCD. A 6″ D-tap cable is included.
Connections consist of SDI and mini-HDMI inputs and outputs, a phone jack for calibration and a USB port for software upgrades. You can loop out from both SDI and HDMI and perform conversion out from HDMI to SDI. (If your camera has a mini-HDMI port, like many cameras do, then you will need a mini-HDMI to mini-HDMI cable to connect the camera to this viewfinder.)
Adjustable features include Brightness, Contrast, Color Temperature, Sharpness, various Scan modes, Markers, User Aspect Zoom, and Blue Gun. Professional features available are 3G Level A/B, Audio Meter, Time Code, Range Error, Zebra, Luma y’ Zone Check, Focus Assist, and Internal Colorbar and Pluge Pattern.
The viewfinder has a lightweight magnesium housing and can be powered by an optional battery or DC power supply.
Technical Specifications
Display 24-bit RGB LED backlit LCD / 3.54″ (9 cm)
Resolution 960 x 640
Contrast Ratio 1000:1
Brightness 500 nit
Viewing Angle 160° / 160°
Aspect Ratio 16:9
Inputs mini-HDMI x1
3G/HD/SD-SDI x1
Phone jack x1 (for calibration)
USB x1 (for software upgrades)
Outputs mini-HDMI x1
HD/SD-SDI x1
Material Magnesium housing
Power External DC 6-15V power cable (included)
NP-F battery (not included)
Weight 1.06 lbs (.48 kg)
Power Consumption
⚡ Alphatron EVF-035W-3G • Electrical & Power Profile
- Operating Voltage: 6.8V to 18V DC (Rear NP-F Battery Plate & Locking 4-Pin Hirose DC Input)
- Power Draw (Typical Operation): ~5.0W
- Power Draw (Maximum Load w/ SDI Loop-Out & HDMI-to-SDI Conversion): ~6.0W Maximum (Official Alphatron specification with Retina 960×640 LED-backlit LCD and active 3G-SDI cross-conversion)
- On-Board Battery Standard: 1x Rear Sony NP-F / L-Series battery slot (7.4V)
- External Supply Options: Locking 4-pin Hirose DC input (6.8V–18V) via D-Tap to Hirose cable from a 14.4V V-Mount camera rig
⏱️ Estimated Operating Runtimes (6W Maximum Draw @ 85% Efficiency)
- 🔋 1x NP-F 570 (26Wh — Compact On-EVF Balance): ~3.7 hours (3h 41m)
- 🔋 1x NP-F 770 (47Wh): ~6.7 hours (6h 40m)
- 🔋 1x NP-F 980 (74Wh): ~10.5 hours (10h 29m)
- 🔋 V-Mount 98Wh (via D-Tap to 4-Pin Hirose): ~13.9 hours (13h 53m)
- 🔋 V-Mount 150Wh (via D-Tap to 4-Pin Hirose): ~21.3 hours (21h 15m)
📊 Engineering Note: The 85% Efficiency Standard
- Usable Energy Derating: Published calculations apply a standard 0.85 multiplier (Usable Wh = Rated Wh × 0.85). Electronic viewfinders enforce an automated low-voltage threshold (~6.8V) to prevent image flicker, while the remaining variance accounts for thermal dissipation in the internal HDMI-to-3G-SDI conversion board and DC-DC regulation.
⚠️ Production Advisory: Always close the physical eyepiece shutter when stepping away from the camera outdoors; direct sunlight entering the diopter magnifier lens can burn the internal LCD panel in seconds regardless of power state.
🛠️ Full Rig Planning: Powering your Alphatron EVF via D-Tap from your main camera battery? Access the interactive FRENEL Power & Battery Runtime Calculator to model cumulative amperage draw across your complete camera build.
Included
Alphatron Evf-035W-3G 3.54″ Led-Backlit LCD is avalable to rent at FRENEL rental.
