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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Wed Nov 26, 2008 8:32 pm Post subject: Re: Dwin HD-700 memory profiles |
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| Davo wrote: | This thread has been very useful for me. I have owned a DWIN HD-700/Transcanner 1 combo for 8 years. I live in the SF bay area. It was set originally up by my installer and periodically I have the system calibrated by Robert Busch who does a great job. However, I want to make some simple changes (I think) without incurring the expense or inconvenience of having to use a professional. But I confess to being confused about how the Dwin memories work. Will someone set me straight.
I understand that the Transcanner has 3 TS memories for 3 aspect ratios. I assume that all standard definition sources that get upconverted by the Transcanner are mapped onto one of those scan frequencies. What about the HD sources that are connected to to VGA/RGB input. Somehow the projector was initially configured for a 1080i source and it looks great. But I want to add the option of a 720p source. I've read that 1080i look best on the Dwin (720p being too soft, I assume from overlapping scanlines) but I want to see for myself. When I plug a 720p source in, the aspect ratio is off and the picture looks horrible, and I haven't been able to figure out how to add another configuration into the HD-700. And how do the memories in the Transcanner and HD-700 relate to each other?
Can someone please take the time to enlighten me. I would be very grateful.
/David |
David, post this as a new topic and you'll get better response.
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Davo
Joined: 16 Nov 2008
Posts: 24
Location: San Francisco
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| Posted: Wed Nov 26, 2008 9:05 pm Post subject: |
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Thanks for the suggestion. I have done so.
/David
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paiaboy7
Joined: 15 Aug 2008
Posts: 68
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| Posted: Wed Nov 26, 2008 9:31 pm Post subject: New |
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What about physically adjusting lenses from 13.5 ft distance? I adjusted the lenses last night for center convergence and have a 100 inch screen sie that looks pretty good. i have a regular dvd player hooked up with a line doubler (until i figure out hd fury but that's another story). I have the hd 145 lenses, don't know if that makes a difference.
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JayAllan
Joined: 03 Jun 2007
Posts: 175
Location: Los Angeles
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| Posted: Wed Nov 26, 2008 10:10 pm Post subject: Re: New |
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| paiaboy7 wrote: | | What about physically adjusting lenses from 13.5 ft distance? I adjusted the lenses last night for center convergence and have a 100 inch screen sie that looks pretty good. i have a regular dvd player hooked up with a line doubler (until i figure out hd fury but that's another story). I have the hd 145 lenses, don't know if that makes a difference. |
Look inside at your lenses when they are on. Your picture should be filling the raster. What you are doing is only using the center of your tubes. You are probably using 1/3 of the resolution that way. Fine for 480p but thats it. You will also ruin your tubes. If you set this projector up correctly it will not look "pretty good" in 480p, it will look "amazing" in 1080i.
Also, I saw mention in here of the Transcanner. These are excellent devices for holding a door open. They only work with standard def. And they are a pain to set up. Any good up scaling dvd player will do as good a job.
As far as a ceiling mount there are several good threads here, or start a new one. Almost everyone on this board has faced this problem, and there are a couple very easy,and very cheap ways to do it. I recommend Unistrut but ask around for whats best for you. There are major advantages to having it ceiling mounted. Once you converge it the PJ can not move an inch or you will loose sharpness.
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paiaboy7
Joined: 15 Aug 2008
Posts: 68
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| Posted: Thu Nov 27, 2008 4:57 am Post subject: Re: Throw Distance |
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Actually the projector is in a closet so the lenses start at 13.5 feet from wall. I think i may be going with that 125 screen size.
| sneeble wrote: | Levy,
JayAllan is right on target here...I ran the numbers and for a 4:3 screen the largest screen possible is around 127" diagonal (102"W x 76"H). Your room is 13.5' long or 162", subtract out the length of the projector (back of the case to the front of the lens) and you have 162" - ~26" = 136". This is the longest possible throw distance you can have. You would need a room 108" tall for that throw distance though. The problem is that your room is only 102" tall. Placing this restriction into the mix yields a maximum throw distance of ~126" (or a 117" 4:3) screen. This gives you a 45.7 sq. ft. screen area. Using a painted wall will yield less screen gain (~0.8 to 0.9) than if you used a commercial screen. Best option here is to eventually use a screen with gain around 1.3 but I would stay at most 1.5 or below to avoid "hot spots". The HD-700 puts out 1100 (max 10% peak white) lumens new and less as tubes age. You should try to stay at or above 11 footlamberts min. of picture brightness for best picture. Using the above numbers you come in around 19.3 footlamberts. This represents the absolute maximum throw of 126" and largest 4:3 screen of 117" given your room dimensions. As previously mentioned the larger you go the harder it is to get good HD resolution so my target would be more around 100" max. (factory preset). |
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JayAllan
Joined: 03 Jun 2007
Posts: 175
Location: Los Angeles
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| Posted: Thu Nov 27, 2008 8:31 am Post subject: Re: Throw Distance |
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| paiaboy7 wrote: | | Actually the projector is in a closet so the lenses start at 13.5 feet from wall. I think i may be going with that 125 screen size. |
Keep your seating back in the room as far as possible. Will look great!
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paiaboy7
Joined: 15 Aug 2008
Posts: 68
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| Posted: Thu Nov 27, 2008 3:25 pm Post subject: Sides of screen |
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How come sides of screen lare half of hexagon \ / like that? Is this because i am projecting upward?
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