Film-Tech Forum ARCHIVE: blurred image in one side of the screen

This is topic blurred image in one side of the screen in forum Film Handlers' Forum at Film-Tech Forum ARCHIVE.

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Posted by Mike Moreno (Member # 4887) on 11-02-2009, 10:55 PM:

i have a problem in one of my big screens, i can´t make the image look sharp, if i focus the subtitles ( remember im in mexico) the image looks blurred on top of the screen.

i tried the procedure y found here on tips.and also check the film gate but still the same [Confused]

im using a big sky console with a ernemann 15 projector.
thenks for your help.

mike morneo
mexico.

Posted by Mike Blakesley (Member # 26) on 11-02-2009, 11:27 PM:

Is your projection booth much higher than the screen? If so, and the screen is not 'angled' toward the projector, you may have a keystoning problem.

When you're seeing a "square" image on the screen, like a building, do the sides of the building seem to flare out at the bottom? If so...that's the issue.

Posted by Jon Miller (Member # 163) on 11-02-2009, 11:45 PM:

Prints with laser-etched subtitles can be a pain to focus perfectly since the subtitles are not in the same plane of focus as the emulsion.

Getting a good compromise between the picture and the subtitles is difficult; a steep projection angle just makes things worse.

Posted by Mike Moreno (Member # 4887) on 11-03-2009, 12:31 AM:

mike, yes the projection booth is too high and the screen is tilt back and i can see the keystone, but i have another screen exactly like this one and i dont have this problem.

jon, the subtitles are a pain in the... i dont know why sometimes they screw the movies with an ugly subtitle print. maybe they don´t care the latin american market.

Posted by Cameron Glendinning (Member # 3516) on 11-03-2009, 01:19 AM:

Is this only on scope, or does it effect flat as well?

Posted by Mike Moreno (Member # 4887) on 11-03-2009, 05:58 PM:

you can see theprobem in flat and scope. but is most perceivable in scope

Posted by Bill Enos (Member # 440) on 11-03-2009, 06:40 PM:

I have a similar problem with our 14 degree down angle and 38 meter throw. You almost have to focus on the subtitles because if they look out of focus it will be much more apparent and your customers will assume the whole picture is out of focus. Our French Film Festival patrons are extremely critical and are usually satisfied if the subtitles are sharp.

Posted by Jon Miller (Member # 163) on 11-03-2009, 07:36 PM:

quote: Mike Moreno
the subtitles are a pain in the... i dont know why sometimes they screw the movies with an ugly subtitle print. maybe they don´t care the latin american market.

Focusing headaches aside, laser subtitling is the only efficient way I know of to get subtitling done for short print runs. I can't say it's about not caring about a particular market; it's about how to easily cater to a foreign market...and, yes, even in the USA where subtitled Asian, European and Latin American movies draw in big crowds at film festivals.

Posted by Gordon McLeod (Member # 33) on 11-03-2009, 07:53 PM:

Actually I think the DTS CSS system would be cheaper if the print has timecode on it

Posted by Jon Miller (Member # 163) on 11-03-2009, 09:17 PM:

And that's a big “if”...in my dozen or so years of film festival work, I've seen only about four prints with DTS timecode, and only one with a DTS disc in the box.

With festival prints, to paraphrase Henry Ford, you can have any digital soundtrack you want as long as its Dolby Digital. [Smile]

Posted by Monte L Fullmer (Member # 2797) on 11-03-2009, 09:48 PM:

Have you checked for trap and gate focus with RP40 by removal of aperture plate? the lenses could be not square with the projector and the whole system may not be square with the screen.

Posted by Eric Robinson (Member # 2966) on 11-04-2009, 12:57 AM:

Is this a recent problem or has it always been a problem since day one?

Posted by Mike Moreno (Member # 4887) on 11-04-2009, 03:10 PM:

i think is a very old problem (since we opened) but at the beginin i didnt know anything about pojection booth.

i check taking out the film gate and using another and nothing.
and also use a RP40. i think that maybe can betha screen frame or maybe the projector is not really aligne with the center of the screen..... mmm i dont know [Confused]

Posted by Demetris Thoupis (Member # 833) on 11-04-2009, 03:51 PM:

Mike the problem is the laser subtitling and nothing else. We have the same issue in some theaters in Cyprus and unfortunately you can only compromise unless you find a way to shift the lens holder so it is not completely vertical with the film gate. A small shim will do the trick and you will gain a better focused picture. You are looking to tilt the lower part of the lens holder outwards but only a bit (a few milimeters are enough). Of course you will need to re-align the lenses then.
Demetris

Posted by Richard Fowler (Member # 893) on 11-04-2009, 04:47 PM:

If you have an E15 lens turret with the silver support post, it may be out of square to the film trap....the weight of the turret + lenses with a downward tilt could be an issue

Posted by Mike Moreno (Member # 4887) on 11-05-2009, 03:04 PM:

i project the movie in another screen that is exactly like the one with the problem and the image looks fina and also the subtitles.

im gonna take a look to the lens turret in order to see if is out of square as Richard said.

im tell eberybody what hapen.

thanks guys