Guest Posted November 4, 2008 Posted November 4, 2008 Hi Guys, I'm getting prepared to ceiling mount my new HC7000 (wonderful pic from the coffee table though) and while measuring angles of dangle it occurred to me that even though I can mount it perfectly in the center of the screen horizontally, it will not be perfectly in the middle .... now there are a number of ways I can get the desired result: angling the projector down to fit the screen &/or using lens shift &/or using keystone correction. Thing is, I have heard that keystone correction should be avoided if at all possible as it alters image quality .... one installer reckons you zoom the pic so that the black surrounds absorb the keystone error. Angling the projector is going to increase the need for keystone correction (I would imagine), and Lens shift I am not sure (could it be the best). Assuming some compromise needs to be made what should it be between the three?
oztheatre Posted November 4, 2008 Posted November 4, 2008 Hi Guys,I'm getting prepared to ceiling mount my new HC7000 (wonderful pic from the coffee table though) and while measuring angles of dangle it occurred to me that even though I can mount it perfectly in the center of the screen horizontally, it will not be perfectly in the middle .... now there are a number of ways I can get the desired result: angling the projector down to fit the screen &/or using lens shift &/or using keystone correction. Thing is, I have heard that keystone correction should be avoided if at all possible as it alters image quality .... one installer reckons you zoom the pic so that the black surrounds absorb the keystone error. Angling the projector is going to increase the need for keystone correction (I would imagine), and Lens shift I am not sure (could it be the best). Assuming some compromise needs to be made what should it be between the three? The problem with keystoning and tilting etc is you are putting the image out of focus, I would avoid that at all costs imo. Try and get it dead level with the light beam hitting the top of the screen, then use some of the lens shift to move left/right or up and down. Lens shift is there to be used afterall, I assume you're not out by much?
collinhack Posted November 5, 2008 Posted November 5, 2008 Yes, lens shifting all the way! Put any thoughts of tilting or keystone totally from your mind :-) And hurry up and give us a full report on the new projector
oztheatre Posted November 5, 2008 Posted November 5, 2008 (edited) Yes, lens shifting all the way! Put any thoughts of tilting or keystone totally from your mind :-)And hurry up and give us a full report on the new projector It went up from $4999 to $5999 a few days back : ( I don't know how they're doing it but the RRP on the upcoming Sanyo Z3000 will be less than the rrp on the Z2000 at $3999..... Z700 $2999... go figure. Yes! hurry up. What i'm hearing back is impressive. I think this new batch of 1080 machines are going to be something special. Epson and Sanyo next, should be impressive. Edited November 5, 2008 by oztheatre
michaeljayc Posted November 5, 2008 Posted November 5, 2008 My centre of my Sony VPL-VW60's lens is about 120mm above the top of my screen. I've used lens shift to bring the image down, but this also seems to distort the picture as well. The bottom of the image is (slightly, but noticeably) wider than the top. The projector is mounted horizontally. I've thought about using a combination of lens shift and tilting to restore geometry. I also have the option of lowering the mounting platform the projector/HE lens is mounted on, but this would be a last resort as it would intrude into the room too much. Maybe a solution for you is a combination of lens shift and a slight tilting of the projector. Michael.
phreek Posted November 6, 2008 Posted November 6, 2008 My centre of my Sony VPL-VW60's lens is about 120mm above the top of my screen. I've used lens shift to bring the image down, but this also seems to distort the picture as well. The bottom of the image is (slightly, but noticeably) wider than the top. The projector is mounted horizontally. I've thought about using a combination of lens shift and tilting to restore geometry. I also have the option of lowering the mounting platform the projector/HE lens is mounted on, but this would be a last resort as it would intrude into the room too much. Maybe a solution for you is a combination of lens shift and a slight tilting of the projector. Michael. Lens shift uses the peripheral parts of your lens to project, so aberrations like barrel and pincushion can distort the picture more. The sweetest image is the one dead centre. I'm surprised the Sony does it though. My Epson is very rectilinear even on moderate lens shift but I have a fully adjustable mount with which to fix the picture so it may be that I have fixed it unwittingly with tilting. Nevertheless a spirit level did show the projector to be true.
pat555 Posted November 7, 2008 Posted November 7, 2008 My centre of my Sony VPL-VW60's lens is about 120mm above the top of my screen. I've used lens shift to bring the image down, but this also seems to distort the picture as well. The bottom of the image is (slightly, but noticeably) wider than the top. The projector is mounted horizontally. I've thought about using a combination of lens shift and tilting to restore geometry. I also have the option of lowering the mounting platform the projector/HE lens is mounted on, but this would be a last resort as it would intrude into the room too much. Maybe a solution for you is a combination of lens shift and a slight tilting of the projector. Michael. G'day Michael, I have just ordered a Sony VPL-HW10 which was about $2,800 but I've been shocked to find that the Sony ceiling mount is selling online for just under $1,100. That seems crazy to me. I was wondering if you are using the Sony mount (PSS-H10) or whether you are using a 3rd party mount? I would appreciate any thoughts on this, options, etc. Also, unfortunately I won't get the HW10 until early December but I have the plasterers booked to come in two weeks time to plaster the ceiling so I need to determine the precise mounting position (if possible or else postpone the plastering). I have downloaded the HW10 manual and used the Sony PJCalc software so I have a pretty good idea but was wondering how much flexibility there is with the location of the PJ. The room is 3.2m wide and the ceiling is 2.6m high. The screen will be 110" (16:9) and the seating about 5m back from the screen. I'm a newb to all this stuff so would really appreciate any thoughts. Thanks, Pat.
phreek Posted November 8, 2008 Posted November 8, 2008 Curious - the HC7000 physically moves the lens and eyeballing it from the front it seems to move the entire optical assembly (just like a telescope in it's mount but through a smaller range) - so I suspect it's still shooting the pic down the middle of the lens If you think about it unless there are prisms in action it is impossible for the light to remain collimated where the lens optical centres are shifted. Nevertheless in photographic perspective control lenses the shifting works because the lens system has a large image circle that is larger than the 24x36mm frame. When you shift the peripheral parts of the image circle play a part. The problem of aberrations, light falloff (vignetting) occurs. Th same would apply where the lens system projects rather than collects light.
mejutty Posted November 11, 2008 Posted November 11, 2008 I have a Panasonic ax200. When you use lens shift it causes the image to go out of shape ie you would need to use keystone to correct it (manual even says if you use lens shift it happens) My last sony hs50 didn't do this tho. So with my pana I have the projector tilted and lens shift so i do not have to use keystone correction. Image is great no loss of focus anywhere,
michaeljayc Posted November 11, 2008 Posted November 11, 2008 G'day Michael, I have just ordered a Sony VPL-HW10 which was about $2,800 but I've been shocked to find that the Sony ceiling mount is selling online for just under $1,100. That seems crazy to me. I was wondering if you are using the Sony mount (PSS-H10) or whether you are using a 3rd party mount? I would appreciate any thoughts on this, options, etc.Thanks, Pat. I use a Chief RPA Elite mount, this is the part that attaches to the projector :- http://www.users.on.net/~michaelcarey/pics/VPL-VW60/ Not cheap, I think around the $300 mark, but certainly cheaper than the Sony mount. Michael.
nis200979 Posted November 12, 2008 Posted November 12, 2008 I use a Chief RPA Elite mount, this is the part that attaches to the projector :-http://www.users.on.net/~michaelcarey/pics/VPL-VW60/ Not cheap, I think around the $300 mark, but certainly cheaper than the Sony mount. Michael. or at $329 RRP the Vogel's PPC200. Looks great on my mates Epson 2000. http://www.vogels.com/pages/professional/p...ils.aspx?id=319
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