help with my lense

[k.i.t.t]

Hey guys

I have started to constuct my projector after reading about all the fabulous ones on here.

The wall on which my screen is mounted is 2meters away from the front of my projector, which is using a 5in sony psone screen.

Now the question is what lense do i need to use to get a pic size of at least 50 in (i know about the pixelation issues before that can gets opened lol) my preferred size would be 60 inch.

I have looked on the surplus shed but to be honest i dont know what i am looking for lol

Thanks for any help you can give

 

[renan]

ok you want a 60inch diagonal with a 5inch screen:

this means 60/5= 12 time magnification

projction distance of 2m:
mean 200/12= 16.7cm focal lenght

Thus for this value I reccomand you a lens from a crt projector 5barco , sony or other) with a diameter size of 5 or 6 and usually those one have a focal of 16cm.

This way it might may be possible to suppress the field fresnel. you'll not find this at surplushed. Look on ebay for crt projector lens, you should find some for 20$.

 

[Guy Grotke]

surplus shed lens

If you do want to use a smaller lens with fresnels, then this one for $6 US would work:

http://www.surplusshed.com/pages/item/l3297.html