Glass window for projector?

[basementjack]

I have my projector behind a window.

I noticed when installing the glass, that the picture dimmed noticably.

I'll say 10-15%

Has anyone else put their PJ behind glass? Any info on what kind of glass (or plexi) would minimize image loss?

the glass I'm using is 1/8 inch thick - appears clear to the naked eye (I'm no glass expert),

[bpape]

If you're going to do that, you need to use optical quality glass for just the reasons you noted.

Bryan

[basementjack]

when you say 'optical quality glass' - is this something an average glass place would know about/stock? Are windows made with optical quality glass? maybe I bought 'shelf' glass instead?

[Prof.]

Jack...I'm no expert in this area but it sounds like you could be getting some light "bounce back"..

Normal window glass has a reflective surface...If you look at a framed picture with a glass covering, you can see light reflections on the glass face..This is why they use non-reflective glass on paintings, so it doesn't detract from the image..
This may be the type of glass you need for the projector..

[bpape]

A normal glass place won't know. Google is your friend. Look on AVS too.

Bryan

[Steve Williamson]

I am after the same glass as you, I saw this article a while ago, but have not chased anything up yet about it: http://www1.electronichouse.com/article/6682.html

A small hole was cut into the wall, and theater glass, like that found in commercial movie theaters, was installed in front of the lens to allow the light to pass through while blocking heat and noise generated by the projector

If you find anything, let me know the product details.

[bpape]

http://www.avsforum.com/avs-vb/showthread.php?p=9642814&highlight=optical+glass#post9642814

[Steve Williamson]

OK, I found that Pilkington's have the Optiview range in Australia, I will try to talk to their rep about the product including pricing:

Pilkington OptiView™ reduces glass reflection to less than 2% compared with 7% for standard float glass when viewed from both the inside and outside

Hopefully that will enable me to soundproof the pj completely.

Steve,

Let me know what size you are after and they price they give you. Might be able to save you a few bucks.

[Steve Williamson]

Managed to get a sample - 100mm by 100mm for free, problem is, the AE1000E arrived and the front is like a hairdryer, I have to cut the bulkhead to allow the whole of the front to breath through.