Increasing proj. magnification

[mattsplatt]

Would there be a way to easily shorten the necessary distance for my commercial projector? Basically, my room is small and the projection created is about 4ft.

I thought an additional magnification lens in front of the main ones might do it, or a mirror at 45 degrees in the 'line of fire' (which works, but is a bit cumbersome and I need a cleaner and bigger mirror)

Any Ideas / links for lenses (pref. available to the UK)?

 

[ELiTeHaYDeN]

Ive read on various pages of the forum that standard eye-glass's lens can be used to increase and decrease the focal length.

*cough* a quick search resulted in this links.
http://www.diyaudio.com/forums/showthread.php?s=&threadid=40883&highlight=

I have not tried nor seen it tried so I guess once again its upto experimentation.

 

[warren o]

The best way to fix this is to re-lens the projector (the manufacturer may sell various lenses for throw size & distance); if it is possible. Some come with fixed lenses and this would be a tricky mod. An external lens would add possible distortion and must reduce the resulting image brightness. I am sure an external lens could be presented in front of the main projector lens, as they do with cameras.
Take a look:
http://www.edmundoptics.com/US/
More research is required to make this work.

The optics are very critical for a projector & one of the most costly elements, too. There is a reason for that. They have a great influence over the final image, like speakers in an audio system.

 

[ELiTeHaYDeN]

if one was going that extent, i think perhaps a 500-600mm projection lens would be an even easier solution..

 

[mattsplatt]

ok, many thanks guys. I think my main problem aside from quality is luminosity, especially with my commercial projector.

btw, i did search the forums, I promise.. just not on the right keywords, as it seems!