Film-Tech Cinema Systems
Film-Tech Forum


Post New Topic  Post A Reply
my profile | my password | register | search | faq & rules | forum home
  next oldest topic   next newest topic
» Film-Tech Forum   » Operations   » Digital Cinema Forum   » Centering Lens on Barco

   
Author Topic: Centering Lens on Barco
Carsten Kurz
Film God

Posts: 3779
From: Cologne, NRW, Germany
Registered: Aug 2009


 - posted 11-11-2017 07:37 AM      Profile for Carsten Kurz   Email Carsten Kurz   Send New Private Message       Edit/Delete Post 
Is there an easy way to center a lens on a Barco (DP2K-6E)? We set this machine up in various locations, and in order to have the best electronic adjustment range for L/R and T/B, I would like to start physical machine adjustment while the lens is centered.
I know I could try to do a full movement run through all directions and count/measure the lens position, then create a 'lens centered' lens file - but is there an easier, more direct way I missed in Communicator?

- Carsten

 |  IP: Logged

Marco Giustini
Film God

Posts: 2545
From: Reading, UK
Registered: Nov 2007


 - posted 11-11-2017 11:15 AM      Profile for Marco Giustini   Email Marco Giustini   Send New Private Message       Edit/Delete Post 
Not that I am aware of.

Another way to confirm the lens is centered is to zoom in and out with a crosshatch: the cross must not shift left/right when you operate the zoom.

 |  IP: Logged

Dave Macaulay
Film God

Posts: 2136
From: Toronto, Canada
Registered: Apr 2001


 - posted 11-11-2017 01:29 PM      Profile for Dave Macaulay   Email Dave Macaulay   Send New Private Message       Edit/Delete Post 
Project a pattern and look at the light on the front element of the lens, it will be centred when the lens shift is centred. You can use a piece of paper against the lens barrel and a dark pattern like red if you can't tell from looking at the glass.

 |  IP: Logged

Sean McKinnon
Phenomenal Film Handler

Posts: 1573
From: Peabody Massachusetts
Registered: Sep 2000


 - posted 11-12-2017 05:58 PM      Profile for Sean McKinnon   Email Sean McKinnon   Send New Private Message       Edit/Delete Post 
My opinion is it is a good idea to perform the lens home function when you remove and replace the lens so that you are sure the lens hasn't been damaged and you know the mechanical limits are recorded properly.

 |  IP: Logged

Steve Guttag
We forgot the crackers Gromit!!!

Posts: 12209
From: Annapolis, MD
Registered: Dec 1999


 - posted 11-12-2017 06:22 PM      Profile for Steve Guttag   Email Steve Guttag   Send New Private Message       Edit/Delete Post 
Sean, the home/return is something completely different entirely.

If the installer does a home/return on installation, the projector has effectively learned where 0,0 is for position, focus, and zoom. Thus, if the lens has been handled in any manner (causing gears to no longer be biased as they were or the lens mount shoved one way or another), rehoming/return should bring everything back to the day-1 setting. Anytime the lens is handled, it should be done. I have found that it is best to not only do it when you first put the lens in, but when you find what positions are going to be for your theatre, to do it again so that the numbers are most accurate where you will be setting the lens.

To the best of my knowledge, Barco has no "center" mode and the techniques listed above will get one in the ballpark. I've tended to use the one by just looking at the front of the lens with a full-white (unmasked) and put the rectangle in the middle.

 |  IP: Logged

Leo Enticknap
Film God

Posts: 7040
From: Loma Linda, CA
Registered: Jul 2000


 - posted 11-12-2017 09:42 PM      Profile for Leo Enticknap   Author's Homepage   Email Leo Enticknap   Send New Private Message       Edit/Delete Post 
That's the way I do it, too - look for the reflection of the white test pattern in the front element of the lens, and then operate the motorized lens shift as necessary to get it in the middle.

Incidentally, at the Barco "101" Series 2 installation training school, you are instructed to do a home and return as a mandatory procedure immediately after every time you insert and latch a lens. It's on the installation checklist in the booklet handed out to the class, and you'll lose a mark if you forget to do it in the test.

 |  IP: Logged

Sean McKinnon
Phenomenal Film Handler

Posts: 1573
From: Peabody Massachusetts
Registered: Sep 2000


 - posted 11-15-2017 05:41 PM      Profile for Sean McKinnon   Email Sean McKinnon   Send New Private Message       Edit/Delete Post 
Your right Steve I was unclear in my post. My understanding is that the lens home and return will bring the lens from where it is to the limit switches and then return back to where it was so you are absolutely correct in that it does not center the lens. What it does do is properly record the position and number of steps available and records a known reference point. I am Sorry for any confusion! [Eek!]

 |  IP: Logged

Svjetlana Oppen
Film Handler

Posts: 5
From: Windsor Ontario Canada
Registered: Aug 2016


 - posted 12-19-2017 01:21 PM      Profile for Svjetlana Oppen   Email Svjetlana Oppen   Send New Private Message       Edit/Delete Post 
Hi, does anyone know default login on Barco Web Communicator? I have to switch the lens and perform lens homing but the company that sold us the projector is not responding to this question. Any help or advice would be appreciated.

 |  IP: Logged

Dave Macaulay
Film God

Posts: 2136
From: Toronto, Canada
Registered: Apr 2001


 - posted 12-21-2017 10:00 PM      Profile for Dave Macaulay   Email Dave Macaulay   Send New Private Message       Edit/Delete Post 
Svetlana - who are you calling? This is not "a secret" and we will answer any requests from customers.
Forum rules prohibit posting passwords here.

Check your messages.

 |  IP: Logged



All times are Central (GMT -6:00)  
Post New Topic  Post A Reply Close Topic    Move Topic    Delete Topic    next oldest topic   next newest topic
 - Printer-friendly view of this topic
Hop To:



Powered by Infopop Corporation
UBB.classicTM 6.3.1.2

The Film-Tech Forums are designed for various members related to the cinema industry to express their opinions, viewpoints and testimonials on various products, services and events based upon speculation, personal knowledge and factual information through use, therefore all views represented here allow no liability upon the publishers of this web site and the owners of said views assume no liability for any ill will resulting from these postings. The posts made here are for educational as well as entertainment purposes and as such anyone viewing this portion of the website must accept these views as statements of the author of that opinion and agrees to release the authors from any and all liability.

© 1999-2018 Film-Tech Cinema Systems, LLC. All rights reserved.