Film-Tech Forum ARCHIVE: PORT GLASS

This is topic PORT GLASS in forum Film Handlers' Forum at Film-Tech Forum ARCHIVE.

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Posted by Ian Bailey (Member # 1752) on 01-15-2004, 09:39 PM:

I have been reading with interest all the posts on this topic and I am keen to replace the very reflective,green edged and very scratched glass that is currently in the ports.It took some time but I have finally tracked down a local supplier.He has had experience supplying glass for this purpose and his recommendation was a LOW-IRON Optical quality glass(without a non-reflective coating).When I mentioned that everything that I have read on this site talks about non-reflective coatings he said that he can supply glass with non-reflective coatings but in his opinion the LOW-IRON Optical quality glass would be FLATTER and thus be a better product.The LOW-IRON glass is more expensive than the non-reflective coated glass (which is also optical quality as far as I know).ANY COMMENTS?

Posted by Sam D. Chavez (Member # 1841) on 01-16-2004, 12:44 AM:

Apropriate coated glass is preferable as its non refelctive properties yield less light loss. This is not a huge issue until you use double pane ports when it then becomes essential to prevent or minimize cross reflection between sheets of glass that end up as a double image on the screen.

Posted by Greg Mueller (Member # 17) on 01-16-2004, 09:25 AM:

The anti reflective coatings are amazing. I use coated glass on my screening room and was surprised that I could not see my reflection (I'm not a vampire) in the glass not matter how I moved around. It wasn't that expensive either. I'm sure if you look in the archives you can find this topic a couple of times

Posted by Ian Bailey (Member # 1752) on 01-16-2004, 09:33 AM:

Thanks for the help guys I am going to replace mine ASAP.I noticed tonight that I could see the whole picture reflected onto the floor next to the projector in our small BIO

Posted by Greg Mueller (Member # 17) on 01-16-2004, 06:17 PM:

You can't tell from the photo, but my picture (at the left) was taken through the anti reflective glass port.

Posted by Chris Byrne (Member # 1563) on 01-17-2004, 01:26 AM:

Ian,

The glass you are after is called 'OPTI-WHITE'. When looking at the edge it has a clearish tinge rather than the cheaper glass, which has a green tinge.

From memory you should pay about $40 - $50 per pane. I got it close to cost price, however I have heard it as high as $80 a pane.

Posted by Ian Bailey (Member # 1752) on 01-17-2004, 03:07 AM:

Chris
I have been quoted $150 plus freight for a piece of the "low-iron optical quality glass(approx 450mmx350mm)and was told the non-reflective coated glass was a bit cheaper than that.Where did you get the opti-white glass from,and did you notice a lot of difference after you installed it?
What do you use to clean the glass and do you know of any product that will reduce the static on the glass so it stays
cleaner longer?
ps and where is KIRWAN?

Posted by Brian Guckian (Member # 1678) on 01-17-2004, 03:37 PM:

Hi Ian

I don't know how much money you have available, but a company here in Europe is now supplying a fire-rated non-reflective-coated optical ("white") glass. Check out:

www.focuscomp.dk

If your ports are small enough it might be viable to ship them...who knows!

Posted by Chris Byrne (Member # 1563) on 01-17-2004, 07:59 PM:

Ian,

The company who supplied the glass is a local one named Nu-Lite. I got it at cost due to knowing the manager at the time. I will check specifics when I go back to work, as it was a couple of years back. I am sure it worked out to be about $50 per pane for the size you are after.

Kirwan is a suburb of Townsville in Queensland.

I know there are many arguments for and against what to use for cleaning port glass, however we use 1 part metho diluted with one part water. It works fine with lint free paper wipes and leaves no streaks.