Before I mount my projector... - AVS Forum
Forum Jump: 
 
Thread Tools
post #1 of 12 Old 01-20-2012, 12:04 AM - Thread Starter
Senior Member
 
bassage's Avatar
 
Join Date: Oct 2002
Location: Phoenix, Arizona
Posts: 286
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Liked: 10
I want to make sure I'm doing this right so I have the best position before I put holes in my ceiling.

What I did to find the right spot is I moved the pj to its closest possible throw distance that will fill my screen size, with the zoom all the way back to it's largest position. Then I moved the pj back about a foot or a foot and a half, just so I could move the zoom in a little bit so that it would not be at its extreme. Is this the correct place to mount it?
bassage is offline  
Sponsored Links
Advertisement
 
post #2 of 12 Old 01-20-2012, 04:13 AM
Advanced Member
 
jamieuk147's Avatar
 
Join Date: Aug 2007
Posts: 617
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Liked: 11
Best place is no zoom but a little is no problems
jamieuk147 is offline  
post #3 of 12 Old 01-20-2012, 04:17 AM
AVS Special Member
 
srauly's Avatar
 
Join Date: Apr 2000
Location: W Simsbury, CT, USA
Posts: 1,529
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 13
That's the approach I'd probably use. Technically, some might argue that your lens will be at its optimum position closer to the middle of the zoom range, but the closer you go the more lumens you'll get. Another consideration might be placement in relation to your viewers' heads (e.g., to minimize noticing the fan noise).

Also, if your projector has a decent zoom range and lens shift, you might become interested in a wider screen (e.g., 2.35:1). In my case, I'm thinking of doing this but will need to manually zoom/shift to adjust. That would require that you place the projector in a place where you can fill both screen ratios.

Scott R
--------------
I'd much rather watch a great movie in B&W at 240 lines of resolution than a lousy movie in 1080p with lossless audio.
srauly is offline  
post #4 of 12 Old 01-20-2012, 06:41 AM
Advanced Member
 
toofast68's Avatar
 
Join Date: Nov 2007
Location: NorthEast Ohio, USA
Posts: 938
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Liked: 19
Quote:
Originally Posted by jamieuk147 View Post

Best place is no zoom but a little is no problems

Mmmm, I was looking at getting a 5010 to fill a 120" diag screen.

No zoom would be the throw at almost 25 ft.

I can't go any bigger on my screen...so I was told that the closer the better. What problems would arise using zoom and 13ft away vs. no zoom and 25 ft away ?


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

toofast68 is offline  
post #5 of 12 Old 01-20-2012, 07:30 AM
AVS Special Member
 
srauly's Avatar
 
Join Date: Apr 2000
Location: W Simsbury, CT, USA
Posts: 1,529
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 13
I think you got his suggestion backwards, but maybe I'm the one who is confused. At 25' I should think that you would be setting the projector's lens to the max zoom length (to shrink the image), while at the closest distance, you'd be "un-zooming" the lens. My thinking here (using camera zoom as a parallel) is that you are needing to utilize the zoom when you are farther away, and wanting to be at the widest angle setting when closest to the "subject" (in this case, the screen).

In any case, the argument in favor of positioning it as close as possible to the screen is that you get the maximum lumens, and an argument (I think) in favor of positioning it as far away as possible is that you might get a slightly sharper picture / minimize convergence issues. Again, though, someone feel free to correct me if I've misstated anything.

Scott R
--------------
I'd much rather watch a great movie in B&W at 240 lines of resolution than a lousy movie in 1080p with lossless audio.
srauly is offline  
post #6 of 12 Old 01-20-2012, 07:56 AM
Advanced Member
 
tommyv2's Avatar
 
Join Date: Oct 2007
Posts: 543
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 13
I can anecdotally tell you that using less zoom (ie: making the picture smaller) provides a sharper picture and less optical issues. The more physical surface area of the lens you use, the worse it gets. Throw on a bright screen, and look at your lens while you zoom in and out, notice how much area gets lit up. At the edges of your lens, you'll lose sharpness and get more purple fringing.

I have a friend with an identical projector (7 units apart in serial number!) and his setup is further away, but using almost no zoom. His picture is much sharper than mine, which uses max zoom (I can't mount it any further back).

=Tommy v2=
tommyv2 is offline  
post #7 of 12 Old 01-20-2012, 08:05 AM
Advanced Member
 
toofast68's Avatar
 
Join Date: Nov 2007
Location: NorthEast Ohio, USA
Posts: 938
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Liked: 19
Quote:
Originally Posted by srauly View Post

I think you got his suggestion backwards, but maybe I'm the one who is confused. At 25' I should think that you would be setting the projector's lens to the max zoom length (to shrink the image), while at the closest distance, you'd be "un-zooming" the lens. My thinking here (using camera zoom as a parallel) is that you are needing to utilize the zoom when you are farther away, and wanting to be at the widest angle setting when closest to the "subject" (in this case, the screen).

In any case, the argument in favor of positioning it as close as possible to the screen is that you get the maximum lumens, and an argument (I think) in favor of positioning it as far away as possible is that you might get a slightly sharper picture / minimize convergence issues. Again, though, someone feel free to correct me if I've misstated anything.

Maybe we are all confused....

I was going on this logic...that farthest back has NO ZOOM.

But I think the concept is that you DON"T want to to use Zoom, so you should ideally mount (if brightness and room) does not prevent at 0 zoom length...but no way can I do that..so I will just have to suffer.
LL


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

toofast68 is offline  
post #8 of 12 Old 01-20-2012, 10:44 AM - Thread Starter
Senior Member
 
bassage's Avatar
 
Join Date: Oct 2002
Location: Phoenix, Arizona
Posts: 286
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Liked: 10
I realize that the best option would be no zooming at all, but that would set the pj waaay back, and I would lose brightness. I'm lighting up a 130" 16:9 screen with an Epson 8700. I want to get it as close as possible to get as much brightness as I can, and using the least amount of zoom I can get away with. With the method I am trying in my first post, that brings me to about 14 feet. Just wondering if I should move back a little, or is this the best place for my situation?
bassage is offline  
post #9 of 12 Old 01-20-2012, 01:42 PM - Thread Starter
Senior Member
 
bassage's Avatar
 
Join Date: Oct 2002
Location: Phoenix, Arizona
Posts: 286
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Liked: 10
I'm amazed that I can't find any answers to this on google. No simple guides or advice about the perfect mounting spot for projectors. Maybe I need to work on my google skills.
bassage is offline  
post #10 of 12 Old 01-20-2012, 01:59 PM
Senior Member
 
mbrennem's Avatar
 
Join Date: Jul 2001
Location: Ontario, Canada
Posts: 289
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Liked: 10
If you mount it as close as possible to the screen (for your required image size) you may get some minor distortion but you'll get maximum brightness. So what I did was go about two feet back from the closest position, which is pretty much exactly what you said in the original post, so I would say you've got it right!
mbrennem is offline  
post #11 of 12 Old 01-20-2012, 02:00 PM
Advanced Member
 
toofast68's Avatar
 
Join Date: Nov 2007
Location: NorthEast Ohio, USA
Posts: 938
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Liked: 19
Quote:
Originally Posted by bassage View Post

I'm amazed that I can't find any answers to this on google. No simple guides or advice about the perfect mounting spot for projectors. Maybe I need to work on my google skills.

Hehe, well I don't think your answer exits. I have been researching same thing.

My take away...get is as close as you can to get brightest lumens, then back off 1/2 foot or so to give you focus options, zoom options.

Make sure anything like 2:35 - 1 etc. can be accomodated with your location.

Of course, it really depends WHAT you are trying to do. If you had a SUPER BRIGHT projector, and you wanted to MOUNT behind you in another room, then the opposite occurs.

Your proposed location seems perfect to me.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

toofast68 is offline  
post #12 of 12 Old 01-20-2012, 03:09 PM
AVS Special Member
 
coderguy's Avatar
 
Join Date: Dec 2006
Posts: 9,984
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 16 Post(s)
Liked: 147
Throw distance doesn't have a huge effect on most projectors LENS anymore like it used to, projectors have just gotten a lot better and sharper in general. It can still affect it some though.

I would be WAY more worried about brightness than sharpness related to throw distance.

It at least partly depends on the specific projector to the sweet spot of the lens, as well as it depends on if you are using lens shift.
Generally farther back at Mid-Zoom to farthest throw is probably the sweeter spot IME, but the closer generally the better if you need the extra lumens. Mounting farther back can have some benefit to a projector's On/Off contrast (black level) depending on the projector, for some projectors even On/Off isn't really affected either.

If your image is TOO DIM at farthest throw, then the other attributes are less important anyhow IMO.



To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
for both one projector or dual stacks

Web Calculator v023 & v025
-
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

**Current Projector Calculator** --
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


Coder's Top Projector Picks of 2012 --
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

coderguy is offline  
Reply Digital Projectors - Under $3,000 USD MSRP

User Tag List

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page


Forum Jump: 

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off