Hey all,

Designing a projector with a 7" lilliput screen...need answers to two critical questions.

Using

- 275-320 focal triplet (40 mm back and 50 mm front lens)
- 150 HCI-T Powerball bulb G12
- Tridonic.atco electronic ballast
- cold-mirror reflector 40mm focal


1. Should I use a 305 mm or a 330 mm focal condensor fresnel?
2. Should I use a 160 mm or 220 mm focal collector fresnel?
3. What focal pre-condensor would be best? Currently have 3" (76.2 mm) diameter and 4" (101,6 mm) focal at hand

Thanks,

h3ndrix

Oh, forgot, its a split design with 15 mm between collector fres. LCD and 25 mm between lcd and condensor fresnel

Here you go.
Click to view attachment
LCD to triplet distance


Click to view attachment
220FL


Click to view attachment
160FL

I don’t hold allot of faith in the vari-focal triplet though.

DJ

does that mean I want a narrower arc collection angle?

what about the other questions man:)

thx