Buhl Long Throw lense Info?

[Gunawan W]

Hi Guy,
from your explanation, if I understood correctly, my problem is not spherical abb.
Below is the picture to simulate what problem I'm facing, I can't get real good photo, so I made this picture, what's your comment?

thank's

 

[Guy Grotke]

It looks like the smeared parts are only on the side away from the center of the screen. That might be reflections inside the lens. Do your lenses have anti-reflective coating? Any place that makes eyeglass lenses should be able to get them coated for you.

 

[ramkishan]

Re: longthrow DIY PJ

Hi Guy,
do you still use your longthrow DIY PJ?
How's the projection images? do you get bright, sharp and vivid color of the images?
- my lens to screen distance is 18 ft, I use 15" LCD, screen diagonal size is 100" (4:3).
Can I use field fresnel with 550mm fl from LumenLab? Do you use this fresnel?
Do you have website about your DIY PJ in detail?

Thankyou.
Gunawan.

Hi Gunawan, I am using the longthrow lens of DIY PJ. The images are excellent. My lens to screen distance is 22 feet, image width 120", LCD 13.3" XGA, fresnels 220/330 from the junk OHP. My web page is http://www.drtsolutions.com/Projector.htm which gives all the details of projector as well as images. BTW I liked your schematic and hence I have reproduced the same on my web page. Thanks for such a nice schematic diagram which will be helpful to the newbies.