Split Optics
From Lumenlab
In the diagram below the collimating fresnel is behind the panel and the collector Fresnel Lens in front. This allows for Keystone Correction of up to 15°. Note the benefit of keystone correction comes at the expense of some image quality because the collector fresnel lens has rings in it that can introduce a small amount of distortion; however, the distortion is minimal and has been found quite acceptable by many builders. Lumenlab lenses are of sufficient quality to allow the collector to be placed in front of the panel with a minimum of distortion.
The reflector we are using is a spherical reflector, or section of a sphere. The lamp arc should be positioned at the centre of curvature so that it can reflect light back through the arc and increase the total lumens available.
1. Point light source 65K T15 Lamp
2. Tempered glass ‘isolation’ plate, 1/8” thick
3. 2 Fresnel lenses:a) 220mm FL collimator (condenser) and b) 317mm FL collector (field).
4. LCD module, 15” (See ["Compatible Monitors"])
5. Projection Lens:S15 Projection Lens Triplet 60mm clear diameter, 320mm FL.
6. Screen
A. Spherical Reflectors (Available in the Lumenlab Store.)
B. Light path
Continue to Keystone Correction or go back to Un-Split Optics.
