How much for a curved screen setup? - AVS Forum
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post #1 of 18 Old 01-08-2013, 12:24 PM - Thread Starter
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I have a 106" white screen at the moment. AE8000 Panasonic on the way to replace the IF5700. I´m curious what a curved screen setup would cost me. There's the screen and also a special lense needed to make the picture look correct on the curved scree, correct? With a curved screen it's possible to have a much higher gain screen without hotspotting is it not? Sounds nice for video games and 3D material.

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post #2 of 18 Old 01-09-2013, 01:41 AM
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The curved screen is only needed to compensate for the pincushion effect of using an anamorphic lens. The amount of curve needed will be effected by the throw distance and at long throws may be hardly justified (as in my setup I use a flat screen and an A Lens, but only have tiny amounts of overspill in the corners from pincushion).

The lens that you will need will cost in the order of a similar amount to your projector: There are some new cheaper A Lenses that have come out, but these don't have the correction for chromic aberation and your AE8000 doesn't have the zonal pixel adjustment that can help with this cheap lens.

Of course if you want a curved screen because it looks 'cool' then no one can blame you, but it's kind of putting the cart before the horse. I'd be in the 2.35:1 forum asking about throw distances and which lens to buy before worrying about the curved screen, especially if you already have a screen to try it on.

Zooming: Been there, done that, bought the lens...
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post #3 of 18 Old 01-09-2013, 10:54 AM
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What Kelvin said. However, if you want ballpark numbers for a good setup:

$3000 for the A-lens
$1500 for the screen (unless you go DIY)

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post #4 of 18 Old 01-10-2013, 01:00 AM
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You can get a curved screen for under a $1000 from Grandview screens.
http://www.quebecacoustic.com/Grandview-Permanent-Fixed-Frame-Prestige-Curved-Screen_en_778prod.html
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post #5 of 18 Old 01-10-2013, 08:44 AM
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This is true, however, if you're spending that much already, another $500 is a small increase to get a premium screen from a company like Stewart.

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post #6 of 18 Old 01-10-2013, 02:37 PM
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You won't find a curved screen from Stewart for $1500...more on the order of $4K+. But if you aren't going to use a cylindrical anamorphic lens, there's no point in going curved, and cylindrical lenses cost quite a bit more than prismatic.
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post #7 of 18 Old 01-10-2013, 03:39 PM - Thread Starter
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Thanks guys.. that's quite a bit beyond my budget. I was curious about curved as I know it's possible to go higher gain without hotspotting. Would be nice for bright sports, 3D and video games.

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post #8 of 18 Old 01-10-2013, 04:29 PM
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Without wishing to be rude, I'd respectfully suggest that a cylindrical lens and a Stewart screen is perhaps a little excessive for an AE8000. In any case hotspoting might be less of an issue with a longer throw distance, though that tends to mean less projector zoom, which in turn gives less lumens so it's a bit of a balance. You'd have to do the sums, but it might be that you could use a 2.4 gain HP screen (flat) and a longer throw distance and still have a bright enough image and avoid hotspotting. The longer throw tends to give a sharper image in my experience anyway, so much so that I wouldn't use a short throw set up even if I was designing a room from scratch and could chose where ever to put the projector.

Zooming: Been there, done that, bought the lens...
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post #9 of 18 Old 01-10-2013, 04:52 PM - Thread Starter
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The back wall prevents me from having a very long throw. I have a sample of the HP and I find the viewing cone to be EXTREMELY narrow. It looks brigther than my 1.0 white screen for 1 seating postion, and that's it. So whenever I have guests over watching sports or playing video games, they'd be screwed.

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post #10 of 18 Old 01-11-2013, 01:20 AM
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If you have a short throw, then an A Lens isn't going to work at it's best either. Ideally you'd have the projector zoomed to near minimum size without the lens in place. If you have lots of zoom applied before the lens in place you would need a very large lens to avoid vignetting. Something like the larger Isco IIIL (or whatever it's now called) which costs maybe 2.5-3x the price of the AE8000 (UK prices anyway). Even so the amount of pincushion is directly effected by the throw ratio, so you would need that curved screen for lens use. However, you would have to leave the lens in place and scale for 16:9 as otherwise your non lens use 16:9 will give you the opposite effect to pincushion and have a 'barrel' effect where the middle of the image overspills the screen edges. Depending on your priorities this might be equally as annoying as pincushion for 2.35:1. You just have to choose your poison.

Zooming: Been there, done that, bought the lens...
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post #11 of 18 Old 01-11-2013, 04:51 AM
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I'm also interested in using a curved 136" Prismasonic screen in combination with a Panasonic AE8000, if i would use this combination without an anamorphic lens what would be the consequence?
As i understand from Kelvin I would have a pincushion effect?

That's it man, game over man, game over!
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post #12 of 18 Old 01-11-2013, 07:04 AM
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Why do you want a curved screen if you aren't using a lens with it? You'll get the image going off the screen in the middle without the lens, so it's the opposite of pincushion effect. The image will take on a barrel effect and you will probably find that you can't focus uniformly across the screen either.

Quite pointless IMHO.

Zooming: Been there, done that, bought the lens...
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post #13 of 18 Old 01-11-2013, 07:55 AM
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Quote:
Originally Posted by Kelvin1965S View Post

Why do you want a curved screen if you aren't using a lens with it? You'll get the image going off the screen in the middle without the lens, so it's the opposite of pincushion effect. The image will take on a barrel effect and you will probably find that you can't focus uniformly across the screen either.

Quite pointless IMHO.

I can get a good price and it looks cool cool.gif , Thx for your input Kelvin, will re-evaluate my options.

That's it man, game over man, game over!
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post #14 of 18 Old 01-11-2013, 07:57 AM
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I agree it looks cool, but once actually using it then less so without a lens.

Zooming: Been there, done that, bought the lens...
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post #15 of 18 Old 01-15-2013, 03:56 PM
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I find that the curved screen is rather silly anyway. When using the a lens at the correct throw, you have very little if any pincushion anyway. Curved screens really only help in less than optimal throws and positions which then results in other inherent problems of using a lens. Don't bother with a lens unless you have a dedicated theater in which you can use it properly.

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post #16 of 18 Old 01-20-2013, 03:36 PM
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the curved screen is cool and I envy David the drone in Prometheus
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post #17 of 18 Old 01-20-2013, 08:34 PM
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There are a few advantages to the shorter throw curved screen set up with lens. The shorter throw does give you added brightness, the curved screen reflects less light on the side walls and it also directs more light back to the viewer. The curved screen is pretty cool looking also, but I would not recommend a curved screen just for the coolness factor, because of the drawbacks listed in the posts above. The curved screen choice really comes down to screen size wanted and throw distance available for use. In other words, I would not go with a curved screen, unless the situation required it, because there is added cost involved. In my case, I could not have gotten the screen size I wanted in my room. Did not have enough throw to do the zoom method for my 9' wide screen, but using a lens I had plenty of throw. It did require me to use a curved screen. If considering a lens, then one of the most important aspects that I have found is, what you are going to use to preform the vertical stretch. From what I have seen, many projectors when preforming the vertical stretch, soften the image when used with a lens. A good video processor preforming the stretch, keeps the image sharp. This aspect is often times overlooked by lens buyers and they end up saying the lens softened the image, when the lens really had nothing to do with the problem.

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post #18 of 18 Old 01-21-2013, 01:51 AM
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Just to add that while using a shorter throw might add brightness, by the same token it reduces contrast. Also, using more zoom in the projector tends to give a softer image as more area of the lens (and the A Lens) is used. If you can set aside a room for a fixed curves screen, then surely you can decorate it in a dark colour scheme, so lighting up the side walls (a curved screen will still reflect light to the ceiling same as a flat screen remember) is a minor consideration IMHO.

I think that it is more a solution when (as in many AV situations) we have to chose a compromise because the room isn't ideal in terms of size, layout and throw distance. I've seen a few thread lately about curved screens as if they are a means unto themselves, even if the user doesn't plan on having an A Lens. I wonder if there is another forum somewhere that has planted this curved screen seed for any use, or whether it's just coincidence?

I did find that my Lumagen gives a better result for vertical scaling than my projector, so no argument there. smile.gif

Zooming: Been there, done that, bought the lens...
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