CurtPalme.com Home Theater Forum

Robbo · Joined: 29 Nov 2006 Posts: 23

I still don't get why the ISCO III lens is only used in 2.35 mode.

OK, you get more pixel on-screen in 16/9 mode. But if the resolution is good on 2.35, why having the pain of sliding in and out and all the downsides associated with that.

I could be missing something here, but if would install an ISCO III or simular I would leave it in place, and let the scaler handle the different format. On screen pixel per cm2 would be always the same!

PS. which movie is shown in the last 4 screenshots ?

Gino · Posted: Wed Oct 03, 2007 9:52 am Post subject:

ecrabb · Posted: Wed Oct 03, 2007 2:42 pm Post subject:

I don't think you quite understand what the lens is doing. In 2:35 mode, the scaler crops the top and bottom of the source, and stretches it vertically over the panel. Then, the lens stretches the image back optically and removes the compression caused by the scaling. No resolution loss, just some scaling. In 16:9 mode, with lens out of the way, you still get full panel resolution. It's the best of both worlds. On the other hand, if you left the anamorphic lens in place all the time, then on any material narrower aspect ratios, you have to throw away resolution. On 16:9 material, you'd have to literally throw away approximately 28% of the source's resolution. Your 1920x1080 source is now scaled to use the center 1380x1080 portion of the panel! Yuck!

The thing is, the lens makes a full-resolution constant-height setup possible at both 16:9 and 2:35. So, a scope movie is wider than 16:9 material, which is wider than 4:3 material. Instead of the active image area getting smaller and smaller as you go wider, the image gets larger and larger. I can't begin to tell you how cool it was to switch from, Corpse Bride in 16:9 to 300 (2:35) and watch the screen go from ~11 feet wide to 14 feet wide... It's just like a real movie theater instead of a home theater. The scope image should be huge compared to 1.78, yet in most of our CRT setups, the 1.78 image is the largest image.

I thought about doing some sort of 2:1 compromise screen, so I could use full-width phosphor for 2:35, and a not-as-wide image for 16:9, but decided it wasn't worth it the effort. The scope screen IS amazing, though.

Oh... Those screen shots are from Serenity. So-so movie in my opinion... has a made-for-TV feel, but some very cool CGI sequences and a halfway decent story. Several long slow, boring parts interrupted by some great action and sound. It's a renter (coming from someone who owns it).

SC

overclkr · Joined: 08 Mar 2006 Posts: 4227

jask · Joined: 17 Mar 2006 Posts: 10187 Location: kamloops BC

I have to admidt that art's system would be out of my price range for ther forseeable future, but to see a bunch of guys who I trust to tell it like it is speak this well of ANY digital system makes me think that I may have a better chance of owning a digital that one of the high end 9" machines

........ and thats what I am going to tell every guy who has one for sale!!! hey Cliff wanna unload your clunky LOUD projectors???

overclkr · Joined: 08 Mar 2006 Posts: 4227

ecrabb · Posted: Thu Oct 04, 2007 1:39 am Post subject:

overclkr · Joined: 08 Mar 2006 Posts: 4227

Tom.W · Joined: 09 Mar 2006 Posts: 6635

Seems like we've heard from just about everyone but Art ? Wink

emdawgz1 · Joined: 14 Mar 2006 Posts: 7949

ecrabb · Posted: Thu Oct 04, 2007 4:33 am Post subject:

I went ahead and posted the review in Art's thread and put a disclaimer in that I'm a CRT guy.It'll be interesting to see what some of those folks have to say.

Cliff, what kind of fans are they? Standard bath fans? Have you looked at anything like a Fantech duct fan? Like the fans John posted, but for interior application.
http://www.fantech.net/fr.htm

I bet if you mounted them on some kind of isolated mount outside the theater, ventilation would be practically silent. Combine that with John's fan mods, and I would think you get the noise better under control. My engineer friend Chad ran some numbers for me based on the G90's heat dissipation (wishful thinking on my part, and over-engineering). He told me how much airflow I needed for my size hushbox, and a certain allowable temperature increase over the room's ambient air, which was I think +2 degrees F.

Just curious... Why did you guys vent to the exterior? Any concerns with negative pressure on the house with bath fans, hot water heater, etc. running? How many CFM are you venting out of the house... that have to find their way back in during the hot and cold weather. I just vented mine to the adjacent utility room.

SC

Robbo · Joined: 29 Nov 2006 Posts: 23

Ile · Posted: Wed Oct 24, 2007 1:19 pm Post subject:

emdawgz1 · Joined: 14 Mar 2006 Posts: 7949

**kal** · Posted: Wed Oct 24, 2007 2:54 pm Post subject:

Where I live, keeping heat in the house is usually a good thing for 8 months of the year. Smile

(So I dump into an adjacent room).

Kal

JustGreg · Joined: 07 Mar 2006 Posts: 3098 Location: Kenosha, WI

I dump outside my theater too. It keeps company coming back. Shocked

Ahem. Yeah. Too early for potty humor I guess. Embarassed

Seriously tho folks, I built a negative flow/draw powered ventilation system from the 10" long main cooling rat cage fan from a Minolta copier. I took advantage of the drywall boxed in center 'I' beam just in front of the pj to route the heat via a rather crude looking hood(I'm working on making it purdier) into the air space inside the beam box. The boxed beam (now improvised ductwork) continues outside the theater where I boxed in the fan. It's 24v power is provided by the entire power panel snagged from the same copier.

The effluent is tee'd into the bathroom fan but there's a diverter in line before that point so I can capture the heat in the winter. (The theater is pretty much the only 'finished' part of my basement...which pisses me off if I could rant for a second. The house is 32 years old and the 3 previous owners didn't see fit to finish it??!!! Lazy rat bastards! Laughing

)

I use electric baseboard heat in the HT and in hind sight wish I'd built in a way to recover some of the pj heat for the HT. That requires more than just cutting into the side of the boxed beam and putting in a closeable vent. I'm pretty sure I would have had to install a fixed venturi plate. Oh well. Also in hindsight was an oversight to build a replaceable filter into the hushbox. Not that the HT is dusty or anything but still. It would have been nice.

Just one last thing; If anyone is looking to make motorized lifts, pulls, pushes; whatever, get your hands on an old copy machine. Just about all the motors are 24v and reversible. There are reversing travel clutches, mini chains, belts, pulleys, bearing loaded sliders, etc. Lots of goodies.

Greg

ecrabb · Posted: Wed Oct 24, 2007 3:35 pm Post subject:

My part of the country is the worst of both worlds - cold like Kal's in the winter (OK, not THAT cold), but nasty humid in the summer. Half the year (October to March), I'd prefer to keep the heat, and the other half of the year (especially Jun/Jul/Aug/Sept), I don't want the humidity.

I also don't want to put any more negative pressure than I have to on the living space because I'm kind of freaky about radon gas. Basements and negative pressure can be a bad thing depending on where you live - especially if you spend a lot of time in your basement. I was concerned enough about it that I even went so far as to install a sub-slab passive de-pressurization vent to the roof. Obviously, the tighter the house, the more of a concern.

Thinking about this hushbox thing more, now I wish I would have installed both supply and return vents to the hushbox, so I could seal the damn thing up. I don't even have it built yet, but I hope I'm not too disappointed. Should help that I don't have two G90's!!!

Cliffy, do you have anything IN the box to absorb the high-frequency whine and turbulence white noise? If not, it's probably just bouncing around in there and exiting through the holes in the front. I wonder if a box of Auralex Wedgies wouldn't help quiet things down significantly...

Wouldn't cost much to try.

SC

CRT_Ben · Joined: 28 Aug 2006 Posts: 1684 Location: Northern Virginia

emdawgz1 · Joined: 14 Mar 2006 Posts: 7949

ecrabb · Posted: Thu Sep 24, 2009 3:49 pm Post subject:

Not so much click-through, but just driving traffic back to their stores. Guerilla marketing. bull****. So, I nuked both of those spammers' posts. Man, I'm sick of these douche bags. I think I might start a new thread in the OT forum to put all these links in as businesses to definitely NOT patronize.

So, for now... Nobody buy a damn thing from bathroomfanexperts dot com - they suck.

SC