8mm Forum: Placing the projector properly

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Posted by Winbert Hutahaean (Member # 58) on May 22, 2007, 11:15 PM:

Hi all,

After seeing various photos when people showing their films with the projectors, I notice that the projectors were always standing in about 20-30 degrees angle.

Since this is an analog technology, doesn't that angle will create keystoning picture?

I am now setting up my dedicated theatre and I have a possibility to place the projector at 0 degree angle stand position. Will it be good or 20-30 degrees is better?

thanks,

Posted by John Clancy (Member # 49) on May 23, 2007, 03:27 AM:

Get the projector dead flat in line with the centre of the screen.

Posted by Kevin Faulkner (Member # 6) on May 23, 2007, 04:39 AM:

I agree with JC. You should always if possible aim for 0 degree angle.
Yes if you have large angles then you will see some keystone effect and could also get uneven focus with f1.0 and 1.1 lenses where the depth of focus is very small.

Kev.

Posted by Douglas Meltzer (Member # 28) on May 23, 2007, 09:39 AM:

Winbert,

Congratulations on having a screening room and please send pictures! Since I don't have a permanent setup, if I feel like taking the time to do it right I'll use a projection table with telescoping legs to achieve a zero degree angle. If I'm lazy (excellent chance) , I'll take advantage of the "Keystone Eliminator" on my Da-Lite portable screen that compensates by tilting the screen forward.

Doug

Posted by Osi Osgood (Member # 424) on May 23, 2007, 10:24 AM:

What the heck is "Keystoning"? All I know is the more "flat" the angle, the less "stretched" (from top to bottom) the image looks, as well as a sharper overall focus from side to side, top to bottom.

Is Keystoning that rare bizzare incident where you are watching Buster Keaton running across the screen, and a bunch of Keystone cops bust into your living room, (it's terribly hard on walls), tip thier hat, and then jump into the projected image to chase keaton down the street?

Yes, I am a very VERY bizzare man!

Posted by Lars Pettersson (Member # 762) on May 23, 2007, 11:33 AM:

Hi everyone!
For years I was puzzled by the fact that I could project the same print with the same projector and lens, and when showing the film at a distance of 9 feet, the image would be razor sharp, but when projecting from 20 feet the image would sometimes be reasonably sharp, sometimes mysteriously fuzzy... until I took the time to set up the projector and screen ABSOLUTELY at 90 degrees to eachother. I was amazed at how it was now possible to have a perfectly (better than ever) sharp 12-foot picture. The longer the throw, there´s absolutely no margin for error when it comes to misalignment in setting up the projector, and the biggest risk is getting it wrong left-to-right, since tilting the projector upwards is only possible by so much, but not putting the projector correctly at 90 degrees to the screen is very easy to miss! [Roll Eyes]

Cheers,
Lars

Posted by Winbert Hutahaean (Member # 58) on May 23, 2007, 11:21 PM:

Thanks Doug,

I am still constructing the screening room. Now is already 70% done. Below it's the plan. But first of all, I'd like to let you know that I have three major hobbies, they are:

1. 8mm films
2. Train model (HO gauge)
3. Vinyl/records

I have to accomodate the threes into one room, otherwise my wife (the Minister for Finace of the house) will get mad ! [Wink]

The room is 5 m x 3.5 m (15.4 ft x 11.4 ft). So, I took almost half of the room for the train set (scenery), which that the size of the board).

However, if half it's taken by the scenery board, where the projector is going to be? Then my plan in to put the scenery underneath of the projector room. (see picture 1)

Picture 1

quote:
note: the poles seen under the projector/music room are to be taken out when the mezzanine floor has been considered strong enough (the concreat has been solid).

Therefore the projector room will already be 50 cm high from the ground. This is why I mentioned above that I have a possibility to place the projector at 0 degree angle since I just need to place it on the table with 50-75 cm high.

With the above construction, then when I need to play with the train, I just pull the sceney out and use the screening room as the train set room (see picture 2). With this reason I have to provide wheels for the board.

By having 50 cm high of the projection room, I have also a side benefit that I can place the couch at fixed position and not to close to the screen. The couch will be footless but can be added with the foot rest.

Picture 2

Now, I have also to tell you that the projection room is also in share with the turntables. So, I can still listen to the music with equipments (amplifier,speaker, etc) belong to the projectors. What I need is only the switcher/mixer. So it's really cost effective.

Probably it will finish in next 2-3 months and certainly I will post to the proper room if it is done.

ps: Doug, can you manage "Your Screening Room Pictures" as I suggested in that sticky topic? (i.e make sub topic under the owner's screening room)

cheers,

[ May 24, 2007, 04:19 AM: Message edited by: Winbert Hutahaean ]

Posted by Lars Pettersson (Member # 762) on May 24, 2007, 12:55 AM:

Winbert!

That´s an awsome setup! I get kind of envious [Wink]

Cheers,
Lars

Posted by Jean-Marc Toussaint (Member # 270) on May 24, 2007, 01:26 AM:

Winbert, this is fantastic work! Congratulations!

Posted by Graham Ritchie (Member # 559) on May 24, 2007, 03:19 AM:

Winbert
Excellent, what a great set up looking forward to your future photos.

Graham. [Smile]

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