This model is discontinued. View current portable models.

Product Overview

Digitarium Delta 4

The Digitarium Delta 4 is our entry level planetarium system, designed to be easy to transport, set up, and teach with. It projects high contrast 1080 pixel diameter imagery over a full dome with no blind spots or cut-outs. It is the culmination of years of development effort, with our own innovative proprietary lens design.

The Digitarium Delta 4 offers not just a compact size but quick set up, intuitive user interfaces, high resolution, excellent projection quality, and wealth of other features. Digitalis sells inflatable domes in several diameters for a complete portable solution.

Units that have not yet shipped contain NEC refurbished projectors (with one year warranty from Digitalis on this component) and include a bonus free Solar System Collection data set (a $1500 value).


See also Digitarium general specifications.

Maximum Dome Diameter
Approximately 24 feet/7 meters.
Brightness is the main issue, since the larger the dome, the larger the surface area the light from the projector must cover.
Pixel Diameter 1080
Projected Resolution 0.92 megapixels
Field of View 180 degrees, full sky.
Pixels per Degree of Sky
6 average
Angle of Projection
~175 degrees
Base Projector Brightness
4500 Lumens with non-fisheye lens
(Provided for comparison purposes with other systems. Actual brightness with a fisheye lens is significantly less due to not projecting the whole video rectangle and differing lens properties. Please see any of our other models if you need a brighter system.)
Contrast Ratio
Nominal projector contrast is 6,000:1.
Lamp life
Up to 3,000 hours on high, 5,000 hours in eco mode.
Control Unit
Digitarium CU-Z
User Interfaces Included
Audio Output
Stereo with integral speakers; stereo with external user supplied speakers.
Software Nightshade NG Basic
100-240VAC, 50-60Hz, 450W
FCC Class A, CE class A, RoHS compliant

The rugged transit case has built in wheels and an extendable handle for easy transport on flat surfaces.

Purchasing Information

US system price: $16,370

Please use our purchase page for ordering instructions. Outside the US contact a local dealer for pricing.


Purchase price includes:

Please note: these prices do not include a dome, a necessary requirement for system use. Purchase a Digitalis dome with your system and receive a $1,000 package discount.