CurtPalme.com Home Theater Forum

garyfritz · Joined: 08 Apr 2006 Posts: 12088 Location: Fort Collins, CO

ecrabb · Posted: Mon Jan 21, 2008 9:39 pm Post subject:

Wow, and I've always heard Sony's were pretty easy and the NEC's were a little on the tougher side. Interesting. I always thought the 1271 was cake to set up. Very straightforward of course with no scheimpflug or EM focus. Geometry was even pretty easy to get right if physical setup is good.

So, 1271 - Easy. G70 - Eh, not so much. Granted, physical setup consisted of nothing more than dropping a level down from my mounted projector to make sure the green lens was close to center. We used some 2x4's to prop the ass end up to get the raster somewhere near center vertically, and the projector was sitting close to screen center. Even though the projector has to be within an inch or less of center/square, I'll be damned if could get geometry decent. I kept going back and forth between bow, pin, skew and key, and I never did get a nice straight horizontal. Of course, then I found out there was the additional 'balance' control on... what, pin and bow, maybe. I haven't even read up on what those do. Which reminds me, I haven't really read the manual at all. Embarassed

That'll make some good bedtime reading for the next few nights.

SC

mtmelvin · Joined: 18 Mar 2006 Posts: 153 Location: Bay Area, CA

I've never been a big fan of the balance controls on the G70. On the G90 you get separate Key, and Pin adjustments for left, right, top and bottom where as on the G70 you get Horizontal Key, Horizontal Key Balance, Horizontal Pin, Horizontal Pin Balance, (and the same controls for Vertical). I absolutely hate that and its really my only gripe about the G70. Fortunately they improved the controls on the G90.

Despite that, I've always liked setting up the G70. But even if you struggle with it for a while it will be well worth the effort. The G70 (esp with such low hours) should stomp all over your 1271.

-Mark

ecrabb · Posted: Mon Jan 21, 2008 11:03 pm Post subject:

Zebu Fellenz · Joined: 21 Dec 2006 Posts: 2567

I haven't done the fan mod yet but plan to before my G70 gets mounted

**AnalogRocks** · Posted: Mon Jan 21, 2008 11:30 pm Post subject:

fireanimal · Joined: 17 Jul 2007 Posts: 231 Location: Stayner, ON

Just watch you don't run the active image area to far to the sides of the tubes, that's were I ran into problems with mine with bad geometry in the corners. I think the recommeded amount is 7mm, but maybe one of the experts will know for sure. Even with the bad geometry it threw an amazing picture!!

Zebu Fellenz · Joined: 21 Dec 2006 Posts: 2567

**AnalogRocks** · Posted: Tue Jan 22, 2008 12:11 am Post subject:

No but you can put them up for adoption on the fourm. Someone will take them in, clean and care for them and it they get ornary they'll cut them up for parts Shocked

Phil Smith · Joined: 08 Mar 2006 Posts: 7717

Phil Smith · Joined: 08 Mar 2006 Posts: 7717

ecrabb · Posted: Wed Jan 23, 2008 8:57 pm Post subject:

Phil - No, I don't have it mounted yet! It's sitting on a stand behind my head - right under the 1271 that's on the ceiling. So, I'm just data gathering right now.

According to PJCalc, the G70's throw seems to be about 6 or 8 inches longer than the 1271 (I can't remember exactly.) I don't have a lot of flexibility in my mount point on the ceiling, but it's enough I think. I should be able to push it far enough back. We'll see. I'll have to do some tests with it on the floor (to simulate the ceiling), I think to be sure. All I know is I'm a stickler for good geometry and corner focus, so I'm definitely not going to push the rasters out too far.

Hey, can a couple of you G70 guys give me your projector-screen measurement, screen size, and how far your rasters are pushed (and how you like the geometry and corner focus/convergence.) I definitely want to be conservative. Maximized rasters are great, but I don't want to have problems like Gary is having with his geometry. Maybe with enough data, we can compile a good guideline... along the lines of: If you're using approximately the standard projection angle, throw should be 1.2-1.25x screen width (did somebody say 1.22 was optimal?). At 1.3, the raster will be too small, and at 1.15, you'll start having trouble with the corners... or something like that.

I'm waiting to hear back from Curt to see if he has any spare mounting plate's laying around he can sell me and Axatax is going to send me a spare OEM fan he has to replace the one on mine that won't spin up every time... THEN I'll be in HT nirvana. I was hoping to get it on the ceiling for next weekend, but that probably isn't going to happen unless I fab up a mounting plate myself... and I'm too damn busy at work to get specs to somebody to cut me some plate, etc.

SC

winduptoy · Posted: Wed Jan 23, 2008 10:28 pm Post subject:

PJ to screen - 92"
Screen width - 72"
960p72
more details later...have to eat.

Axatax · Posted: Wed Jan 23, 2008 10:55 pm Post subject:

draganm · Joined: 08 Mar 2006 Posts: 8990 Location: Colorado

ecrabb · Posted: Thu Jan 24, 2008 1:56 am Post subject:

Yeah, I can't use one of those. In fact, the way I designed my mount, the projector's mount plate actually recesses right into a cavity in the ceiling. As I tighten the bolts on my mount the bottom of the projector tightens right up to hug the ceiling. It was sweet with the 1271 mount plate because the whole damn thing went up into the ceiling. It won't be quite as nice with the G70 because the mounting plate is quite a bit larger. Plus, when I shift it back, it's going to go to the back of the joist bay, so I'm going to lose a little headroom.

It's already tight with the riser right under the projector - the projector would be obnoxiously low with one of the adjustable mounts. All I really need is the plate, anyway! My mount is dead-ass square to the screen, and perfectly on center (within 1/16"), so I'm not worried about any adjustability besides closer/farther (which I accounted for).

Stupid builder for not asking and stupid me for just assuming houses were all built with 9' basements these days. 93" sucks.

SC

fireanimal · Joined: 17 Jul 2007 Posts: 231 Location: Stayner, ON

Rasters are maxed close to 2mm from the edges, 102" Throw to the front of the lens 78" Screen, and I have severe corner distortion. I still not sure if it is bad lenses on my G70 or what??

Maybe you can start with a small raster on a grid pattern and start to enlarge it until you see the corners start to fall, and that would be the point that I would stop.

If you are watching video only, I would not worry about it, becuase it has had zero effect on that. It is my windows desktop on my HTPC that really pisses my off!

greg_mitch · Joined: 03 May 2006 Posts: 5320

Not a single picture yet? This is an awesome upgrade I would imagine. Congrats SC.

garyfritz · Joined: 08 Apr 2006 Posts: 12088 Location: Fort Collins, CO

ecrabb · Posted: Sat Jan 26, 2008 7:13 am Post subject: