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OK, so the difference between a £200 printer and a £2,000 printer is
that one can print 10,000 pages a month and not break, and the other can't.
So what's the difference between a £500 projector and a £1,500 projector?
(By "projector" we're talking about something that you plug into your
laptop so the whole room can see the Blue Screen of Death in 12' x 12'
format. Not the ones that project transparent slides onto the wall...)
--
http://blog.orphi.me.uk/
http://www.zazzle.com/MathematicalOrchid*
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> So what's the difference between a £500 projector and a £1,500 projector?
Check:
- Brightness
- Native resolution
- Size
- Contrast ratio
- Noise level
- Lamp lifetime
- Colours saturation
- Number and type of inputs
- Fancy extras like auto-focus, auto-keystone, USB/LAN control etc.
- Can it be used upside down (for ceiling mount)?
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>> So what's the difference between a £500 projector and a £1,500 projector?
>
> Check:
>
> - Brightness
> - Native resolution
These two are prominently displayed on all the item descriptions.
There are £200 projectors at 1024x768 and 2500 lumens, and there are
£4,000 projectors at 800x600 with 2000 lumens.
> - Size
> - Contrast ratio
> - Noise level
> - Lamp lifetime
> - Colours saturation
> - Number and type of inputs
> - Fancy extras like auto-focus, auto-keystone, USB/LAN control etc.
> - Can it be used upside down (for ceiling mount)?
Contrast and lamp lifetime [and cost!] seem important. None of the rest
seem especially important for what I need.
What's auto-keystone?
--
http://blog.orphi.me.uk/
http://www.zazzle.com/MathematicalOrchid*
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On Mon, 23 Jun 2008 15:08:30 +0100, Invisible <voi### [at] dev null> wrote:
>So what's the difference between a £500 projector and a £1,500 projector?
Like most things the more you pay the more you get. Things to look for
are; Image Brightness, Contrast Ratio, Resolution, Colour support,
Bulb life cycle (full power/ economic mode), Video and Audio
Inputs/outputs, Weight and Dimensions. Not to mention reliability and
customer service.
For occasional use a cheaper one will be OK but for high usage showing
high quality work you would want a dear one. Unless you are paying for
it yourself.
--
Regards
Stephen
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>> - Size
>> - Contrast ratio
>> - Noise level
>> - Lamp lifetime
>> - Colours saturation
>> - Number and type of inputs
>> - Fancy extras like auto-focus, auto-keystone, USB/LAN control etc.
>> - Can it be used upside down (for ceiling mount)?
>
> Contrast and lamp lifetime [and cost!] seem important. None of the rest
> seem especially important for what I need.
Noise? There's nothing worse than trying to listen to somebody or watch
something and have the horrible loud buzz of a projector in the background.
> What's auto-keystone?
Makes the image look square on the wall/screen, even if the optical axis of
the projector is not exactly perpendicular to it (good if the projector is
portable, not much use if it is going to be fixed).
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scott wrote:
> Noise? There's nothing worse than trying to listen to somebody or watch
> something and have the horrible loud buzz of a projector in the background.
Ah. OK. The projector we currently have is pretty much silent. I forgot
that some projectors aren't.
>> What's auto-keystone?
>
> Makes the image look square on the wall/screen, even if the optical axis
> of the projector is not exactly perpendicular to it.
Oh, OK.
--
http://blog.orphi.me.uk/
http://www.zazzle.com/MathematicalOrchid*
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BTW, I got a NEC NP60 for our office, because it needed to be compact and
bright. Pretty well satisfied with it (it works well even with the blinds
open), but I wouldn't say it was completely silent.
I see it's only 650 GBP now, XGA 3000 lumens 1.6 kg.
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scott wrote:
> Check:
>
> - Brightness
> - Native resolution
> - Size
> - Contrast ratio
> - Noise level
> - Lamp lifetime
> - Colours saturation
> - Number and type of inputs
> - Fancy extras like auto-focus, auto-keystone, USB/LAN control etc.
> - Can it be used upside down (for ceiling mount)?
Sharp PG-MB60X:
- 2500 lumens
- XGA
- 31 cm x 28.7 cm x 10.4 cm
- 1000:1 contrast
- 2000 hours lamp lifetime
- £1,098.99 + VAT.
Acer X1260:
- 2000 lumens
- XGA
- 26.7 cm x 18.7 cm x 8 cm
- 2000:1 contrast
- 4000 hours lamp lifetime
- £334.99 + CAT.
What am I not seeing? It's got slightly less brighness, twice the
contrast, twice the lamp time, and it's about 60% cheaper. Does not compute.
PS. Why do all the "DLP" projectors have 10x the contrast ratios of
"LCD" projectors??
PPS. Not one single product description includes noise data.
--
http://blog.orphi.me.uk/
http://www.zazzle.com/MathematicalOrchid*
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scott wrote:
> BTW, I got a NEC NP60 for our office, because it needed to be compact
> and bright. Pretty well satisfied with it (it works well even with the
> blinds open), but I wouldn't say it was completely silent.
>
> I see it's only 650 GBP now, XGA 3000 lumens 1.6 kg.
Looks nice, but the product information I have doesn't seem to indicate
the presence of a VGA input...
--
http://blog.orphi.me.uk/
http://www.zazzle.com/MathematicalOrchid*
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> Looks nice, but the product information I have doesn't seem to indicate
> the presence of a VGA input...
Oh it definitely has one of those!
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scott wrote:
>> Looks nice, but the product information I have doesn't seem to
>> indicate the presence of a VGA input...
>
> Oh it definitely has one of those!
OK. Wouldn't be the first time Insight's product descriptions were vague
and/or incorrect...
--
http://blog.orphi.me.uk/
http://www.zazzle.com/MathematicalOrchid*
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Invisible wrote:
> PS. Why do all the "DLP" projectors have 10x the contrast ratios of
> "LCD" projectors??
In an LCD projector, there's a light bulb that shines through the LCD,
which subtracts out the colors you don't want on the wall at that point.
In a DLP projector, there's a light bulb that bounces off microscopic
movable mirrors that reflect the light onto the wall or not, depending
on whether you want that color there.
So in a DLP, there's basically no filter in front of the light, and the
"moving parts" don't absorb the light so they don't get hot as easily.
(Not that they stay cool, but it's not their design goal to turn light
into heat.)
--
Darren New / San Diego, CA, USA (PST)
Helpful housekeeping hints:
Check your feather pillows for holes
before putting them in the washing machine.
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scott wrote:
>
> Makes the image look square on the wall/screen, even if the optical axis
> of the projector is not exactly perpendicular to it (good if the
> projector is portable, not much use if it is going to be fixed).
>
For fixed position lens shift rocks 100-0 over keystone. Only reasonable
keystone is auto-keystone for portable projects. If keystone is manual,
lens shift rocks over it, even on portable projector.
--
Eero "Aero" Ahonen
http://www.zbxt.net
aer### [at] removethiszbxtnetinvalid
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> So in a DLP, there's basically no filter in front of the light, and the
> "moving parts" don't absorb the light so they don't get hot as easily.
> (Not that they stay cool, but it's not their design goal to turn light
> into heat.)
So where does all the light go in a DLP projector when you display a black
image?
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On Tue, 24 Jun 2008 09:16:04 +0200, "scott" <sco### [at] scottcom> wrote:
>> So in a DLP, there's basically no filter in front of the light, and the
>> "moving parts" don't absorb the light so they don't get hot as easily.
>> (Not that they stay cool, but it's not their design goal to turn light
>> into heat.)
>
>So where does all the light go in a DLP projector when you display a black
>image?
>
LOL :)
--
Regards
Stephen
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scott wrote:
> So where does all the light go in a DLP projector when you display a
> black image?
It gets reflected the other direction, into blackness inside the
projector. The trick is, the tiny moving bits where it's focused aren't
absorbing it, but rather the big heat-sink with the cooling system (for
movie projectors) or fan (for little projectors).
It's the difference between using a rescue mirror or a smoke signal. :-)
--
Darren New / San Diego, CA, USA (PST)
Helpful housekeeping hints:
Check your feather pillows for holes
before putting them in the washing machine.
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>> So where does all the light go in a DLP projector when you display a
>> black image?
>
> It gets reflected the other direction, into blackness inside the
> projector. The trick is, the tiny moving bits where it's focused aren't
> absorbing it, but rather the big heat-sink with the cooling system (for
> movie projectors) or fan (for little projectors).
I guess in movie projectors it's more of a problem, but in office projectors
I doubt enough heat is generated to affect the cooling design when there's a
huge inefficient light source pumping out heat a few cm away.
Anyway, I guess you can always mount the absorbing imager onto a heat sink
with some air flow if you really need to.
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