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advice on short throw projector?

February 6, 2006 | 9:15 pm

hi,

for a project, i’m looking for a reasonably priced projector; main
criterium (next to acceptable power & contrast of course) is the
short throw distance it should have.
i’m back-projecting on 2 screens, each 3m wide, and have to deal with
limited stage sizes – so the projector should not be much further
than 3m away from the screens.

for the premiere, i had access to 2 sony beamers with extra wide
angle lenses, but for the tour i’ll have to buy – with a budget less
wide than the lens angles, I’m afraid.
and as the combination of a projector-that-has-the-option-to-change-
the-lens *plus* a wide angle lens is ridiculously expensive, i was
hoping to find a native wide angle projector.

unfortunately, none of the comparison charts i could find online
offer lens angle as search criterium.
the only that projectorcentral.com spit out was the Sanyo PLC-XU58,
witch has a throw ratio of 1.2 -1.9 : 1
( http://www.sanyo.de/produkte_eng/projektoren/lcd/
produkt_techdata.asp?IAD=0&AID=0&P_ID=128&ptyp=2 )

although my ideal throw ratio would be 1 : 1, this one may work in
most cases.

so my questions are:
- does anybody have experience with the sanyo? (not much reviews or
so out there…)

- or is there another native-wide-angle-projector with a throw ratio
of between 1 : 1 and 1.25 : 1?

- is there a nice source of information on wide angle projectors?

- any other tips, maybe on not *that* expensive combos of projector
+wide angle lens?

wide angle thanks,

jan


February 6, 2006 | 9:25 pm

I guess reasonable is a relative term as I’ve heard this projector
called "reasonably priced"
http://www.projectorcentral.com/NEC-WT610.htm . It’s the shortest
throw you’re going to find by far. It doesn’t even uses lenses but
instead uses a series of mirrors to create the projected image.

wes


February 6, 2006 | 9:55 pm

On 06.02.2006, at 22:25, Wesley Smith wrote:

> I guess reasonable is a relative term
true, very true ;-)

> as I’ve heard this projector
> called "reasonably priced"

had seen that one, but i mean the *other* reasonably priced… ehm…
the cheaper one…

> It’s the shortest throw you’re going to find by far.

apart from the fact that this sentence is close to poetry, i have to
say that the short throw distance of this thing frightens me a bit….

i guess for back projection, the material that is projected on has to
be taken into account, too; and with this toaster, lightbeams will
come almost from beneath the screen.
but on the other hand, with a throw distance that short, i could use
front projection, as the box could stand directly in front of the
screens…

hmm…

but before actually seeing it projecting, i don’t believe that it
works, and i meant that other ‘reasonably priced’ anyway ;-)

> It doesn’t even uses lenses but
> instead uses a series of mirrors to create the projected image.

ah, apart from the NEC-wt610, wouldn’t it be possible to use a 1-
mirror system to shorten throw distance of a standard projector a bit?

cheers,

jan


February 6, 2006 | 9:57 pm

> ah, apart from the NEC-wt610, wouldn’t it be possible to use a 1-
> mirror system to shorten throw distance of a standard projector a bit?

Yes, just remember that any vibrations in the mirror will be amplified
in the video image. The amplification will be proportional to
distance as well. So, use a very very sturdy mount.

wes


February 6, 2006 | 10:35 pm

i’ve worked with the wt610 and would recommend you first heavily
study the installation guide before deciding… it has very stringent
requirements and throw angle distances. because of its nature, there
is also a vertical throw distance which must be accounted for.

there are many projectors with changeable lenses that you won’t find
on the projector search engines because they don’t account for
optional lenses. F: .8 fixed is the most common wide angle lens
option, for example this Sharp maybe just what you’re looking for:

http://www.sharpusa.com/products/ModelDetailedSpecs/0,1161,1 529-,00.html

a good prosumer projector reatiler is http://projectorpeople.com/
or a good pro house (rents and sells) http://www.subrent.com/

both of these places will take the time recommend available
projectors based on your wide angle needs, rather than do all the
searching yourself.

deKam


February 7, 2006 | 5:06 am

>
> I have been checking out the projectors you have mentioned, as you say,
> 0.8:1 is almost the shortest throw ratio. However, does the ration means
> the "distance vs diagonal length" or "distance vs width" ?

William


February 7, 2006 | 5:21 am

distance:width i believe

Sanyo venue projectors are worth a look, alot of options & standard
lens mounts across the line.


February 7, 2006 | 6:52 am

On 6 Feb 2006, at 22:15, Jan Klug wrote:
> – any other tips, maybe on not *that* expensive combos of projector
> +wide angle lens?

I have used the Hitachi CPS210W with a 200$ wide angle converter lens
(also from Hitachi)
with good results. we had a projector-to-screen distance of 240 cm
and a screen diagonal of
250 cm (150x200cm). The distance for this installation was fized at
240 cm, and we did not have to
zoom out completely to get our screen size. I never measured the min
distance for that screen size.
From the notes I made back then, I calculate that 215 cm distance
still would produce a 250 cm diagonal.

The CPS210 is the only model from Hitachi that accepts this wide
angle conversion lens.
We found this combination of projector and lens after a long search
and many many
phone calls to dealers, and there are not that many reasonably priced
combos around.

HtH
-jennek


February 7, 2006 | 8:38 am

> distance:width i believe

yep.
explained with nice images on http://www.optomahometheater.com/howto/
b2_2.asp


February 20, 2006 | 10:31 am

I have used sanyo xu55,a predecesor of xu58, for many different installation and stage projects. I have been very happy with the image quality and the wideanglezoom. Feel free to email me if you have any questions.

hc


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