Hi there al you DIYer's.
Building my first PJ. It will be built into a coffee table. This first build is a test run to iron out problems and get the dimensions down pat before building my coffee table.
Fired up the PJ and plugged a dvd player into it using a $100AUS video/VGA converter. Was not happy with the results, the image was not defined and had trouble with the colours and contrast. (The same unit currently on ebay at the moment for about $60-80)
I connected up my PC and the results are far superior. Will take back the converter and exchange for a 15m VGA lead.

I built a keystone correction for my front Fresnell, however could not get enough correction with the PJ on the floor angled up. So I tweeked the last bit with the NV keystone. Works very well. I adjusted the PJ keystone parrallel to LCD and just used NV. Perfect.

Now that I will not be using mechanical keystone, should I stick with the split fresnels or go to unsplit, if split design, should I mount the field fresnell closer to the LCD? (currently about 30-40mm from LCD to get enough keystone )
Also my rear fresnel is bowing a bit, should I mount it hard against the heat shield glass?
One last thing, when I focus, I can get the middle into focus or the outside edges, not both, any ideas folks?
I have a pre-condenser lense from a 250w halogen OHP, would that help to brighten up the edges, as you can see from the photos it gets dark on the edges

Thanks in advance

Alastair,

I see the threaded rods, so I'm guessing that you are doing a verticle build... correct?
If so, then for better light distribution, you could follow Simul8r's lead and turn your bulb 90 degrees.


Also if you go to an unsplit configuration, then your key stoning will be limited, if at all possible. ArizonaVideo has an unsplit, and claims to have key stoning, although limited. However to eliminate the need for key stoning your triplet will need to be aimed perpendiculart to the screen. Therefore if the middle of the screen is 4 feet off the floor, then your triplet will also need to be 4 ft off the floor. Another way to get around key stoning is to angle the screen, so that the top of the screen is further away from the wall than the bottom.

Cheers!

Fulcrum

I am building a horizantal straight through build. The threaded rod you can see is the keystone correction.
I am doing away with physical keystone and going to use NVkeystone from my PC.
I will keep this thread running to show progress of my build, but I will post my previous questions in the technical support forum

Thanks Fulcrum

Wow! I did not even know about NVKeystone. I will have to give that a try tonight. Thanks!

Yep, it's pretty great. I'm using it until I either make my build taller or when
I get the new fresnels I'll probably split for keystone. Until then, NVKeystone
is a mostly fantastic solution. It's part of NView.