If I build a DIY Projector MkIV, to correct keystone....

[Bigg'un]

So to correct Keystone in a projector of this type, and I have searched but I am unsure...do I just have to angle the mirror at the top of the projector, or am I not understanding this much at all?

I have a benq 567sv2 ordered so I wanted to have the best picture quality with it and it seems that a 10-20 degree angle is best, and I want ot know how to correct this if I go the DIY Projector MkIV route. (My wife wants something that looks nice and I don't have a lot of tools to cut things straight with 🙂

I don't know if it matters, but I plan on going with the long throw projection lenses as I'll have to have the projector 13ft-10ft away from the projectin surface (white shower curtain looking good atm).

Thanks for any and all help/opinions.

 

[sjetski71]

From what i've read some of the easiest and best keystone adjustment is accomplished by tilting the framed screen accordingly. Sorry i don't have much knowledge on the schematics of lense/mirror keystone adjustment but i figured i'd post the screen idea as an easy effective solution (for some) 😉.

 

[18wheeler]

in DIY world, there are two ways to do keystone correction. Both needs splitted fresnel lens:

1> keep two fresnel lens halves parallel, tilt the screen

this method gives you slightly better image, because light pass through lcd in an angle, hence the 'optimal view angle'.

or

2> keep the lower fresnel lens half and the lcd parallel, tile the upper fresnel.

this method gives you the ability to adjust keystone if you move your projector.

see the link.

So to correct Keystone in a projector of this type, and I have searched but I am unsure...

http://www.diyaudio.com/forums/showthread.php?s=&threadid=20731

 

[Bigg'un]

Thanks, it seems to make a little more sense now, for themoment I think I will keep things simple just to see if I can get a quality image, then I will split and tilt to increase the brightness and contrast.

Appreciate the reply.