Ch4 3D Optical Advice

Nobody has achromatic lenses in their eyes, i.e. red and blue need
different focus settings. The eyes of those under 40 adjust
automatically to suit the prevailing conditions, but pensioners like
me have lost the power of accommodation, and need different glasses
for different distances.

I found the right-eye blue image on Channel 4's 3D programmes badly
out of focus using my TV glasses. I was able to solve the problem by
swinging my glasses off my right eye so that it saw the screen
directly through the blue filter. Both eyes saw a focussed image and
the 3D experience became a pleasure not a pain.

Those oldies who need glasses for everything would not be able to do
this - all they could do is use their distance glasses on their right
eye and their TV glasses on their left, probably looking through them
from front to back to keep the ear hooks out of their face.

Varifocal users might be able to rotate their glasses clockwise a bit
so that the right eye sees a weaker part of the lens.

Dave W

On Sat, 21 Nov 2009 02:51:43 -0800 (PST), Dave W
wrote:

Nobody has achromatic lenses in their eyes, i.e. red and blue need
different focus settings. The eyes of those under 40 adjust
automatically to suit the prevailing conditions, but pensioners like
me have lost the power of accommodation, and need different glasses
for different distances.

I found the right-eye blue image on Channel 4's 3D programmes badly
out of focus using my TV glasses. I was able to solve the problem by
swinging my glasses off my right eye so that it saw the screen
directly through the blue filter. Both eyes saw a focussed image and
the 3D experience became a pleasure not a pain.

Those oldies who need glasses for everything would not be able to do
this - all they could do is use their distance glasses on their right
eye and their TV glasses on their left, probably looking through them
from front to back to keep the ear hooks out of their face.

Varifocal users might be able to rotate their glasses clockwise a bit
so that the right eye sees a weaker part of the lens.

Dave W

I think you are maybe looking for perfection here!!!

How about investigating prescription tinted glasses with one lens
tinted red and the other tinted blue? You would need to have your
eyes tested separately under coloured lights. This would maken an
interesting challenge for your optician.

Any opticians out there that could comment on this?

In article , Scott
wrote:
How about investigating prescription tinted glasses with one lens
tinted red and the other tinted blue? You would need to have your
eyes tested separately under coloured lights. This would maken an
interesting challenge for your optician.

Don't waste your money. (And in any case it's amber and blue). This
system is not going to catch on - the results are far too flawed and
eyestrain making. Its attempts to represent colour mean that there are
more problems than even the red/green system (which only works on
monochrome originals) and that's problematic enough. I got considerable
ghosting caused by breakthrough of the other eye's image, a strange
ripping on the blue eye on panned shots, very dodgy colour effects and
a headache.

Several firms are working on 'proper' 3-D TV (presumably all
incompatible as usual) so I should wait for the dust to settle.

Why are they using the 2 colour glasses, these failed in the cinema years
and years ago.
Going to see Disney's A Christmas Carol tonight in 3D Imax I doubt they will
use red/ green or blue glasses.
When I went to see Dolby Digital and a Real 3D films the glasses were not
the above coloured ones.

--
Regards,
David

FREESAT HD as it is now it is a joke.

On Sat, 21 Nov 2009 17:52:48 -0000, "David"
wrote:

Why are they using the 2 colour glasses, these failed in the cinema years
and years ago.

Possibly because the 2 colour method is the only one that can be used
with standard TVs.

Going to see Disney's A Christmas Carol tonight in 3D Imax I doubt they will
use red/ green or blue glasses.
When I went to see Dolby Digital and a Real 3D films the glasses were not
the above coloured ones.

Were they polarised?

--
Peter Duncanson
(in uk.tech.digital-tv)

David schrieb:
Why are they using the 2 colour glasses, these failed in the cinema
years and years ago.
Going to see Disney's A Christmas Carol tonight in 3D Imax I doubt they
will use red/ green or blue glasses.
When I went to see Dolby Digital and a Real 3D films the glasses were
not the above coloured ones.


Please try to think about it first - normal TV sets are not able to
separate left and right vision frames electronically. Only colour
separation (red/blue or amber/blue like in this case) can provide for
cheap "glasses" and many spectators (private TV needs viewers for ads).

There is 3D-TV with HDTV quality and LCD-shutter glasses like in digital
3D cinemas - but it´s not cheap enough for the avarage viewer...

Klaus

"Dave W" wrote in message
...
Nobody has achromatic lenses in their eyes, i.e. red and blue need
different focus settings. The eyes of those under 40 adjust
automatically to suit the prevailing conditions, but pensioners like
me have lost the power of accommodation, and need different glasses
for different distances.

I found the right-eye blue image on Channel 4's 3D programmes badly
out of focus using my TV glasses.

So go to the opticians and have pair of glasses made from a correct
prescription - or a correct eye test. Avoid Specsavers as they use the
"nearest" that will do to save costs.

I was able to solve the problem by
swinging my glasses off my right eye so that it saw the screen
directly through the blue filter. Both eyes saw a focussed image and
the 3D experience became a pleasure not a pain.


It was a load of rubbish the whole 3D thing, it was NOT correct 3d
so very few people saw the effects that were possible in tests on TV
in the 80's. What you saw was a remastered original of poor quality
with various colour filters and images pieced back together. It was a
complete waste of time as there was no real 3D images.


Those oldies who need glasses for everything would not be able to do
this - all they could do is use their distance glasses on their right
eye and their TV glasses on their left, probably looking through them
from front to back to keep the ear hooks out of their face.


You seem to forget that not everyone is wearing glasses that are not
effective or match their current needs! Jut because your glasses are
not suitable it doesn't mean everyone else is the same. The problem is
individual to YOU and YOU alone.

Varifocal users might be able to rotate their glasses clockwise a bit
so that the right eye sees a weaker part of the lens.


No one else needs to do this - the problem is YOURS and only YOURS.
God knows why you think that your incorrect lenses in your glasses are
going to affect everyone else. If you need a new prescription go and get
it.
If you need to rotate a lens it shows you have astigmatism and the current
lenses are no good. If one eye and lens provides an image out of focus
compared to the other eye it means your sight has deteriorated since your
prescription or that your prescription does not match the lens.

Dave W

"David" wrote in message
...
Why are they using the 2 colour glasses, these failed in the cinema years
and years ago.
Going to see Disney's A Christmas Carol tonight in 3D Imax I doubt they
will use red/ green or blue glasses.
When I went to see Dolby Digital and a Real 3D films the glasses were not
the above coloured ones.

--
Regards,
David



I still have my 3D glasses from the mid 80's when CH4 tried a few 3D films.
They were red and blue, not red and green as the glasses are now. With the
red and blue the picture looked perfect and 3D worked quite well with things
poking out of the screen etc. What was on the other night was a complete
joke, it wasn't 3D, it was old films manipulated and put togther using
different
coloured filters - it didn't work as they did it incorrectly.
It was a total flop due to a misunderstanding of those responsible about 3D.

"Roger" wrote in message
...

I still have my 3D glasses from the mid 80's when CH4 tried a few 3D
films.
They were red and blue, not red and green as the glasses are now.

What do you mean *now*?

With the
red and blue the picture looked perfect and 3D worked quite well with
things
poking out of the screen etc.

....but very washed out colour.

What was on the other night was a complete
joke, it wasn't 3D, it was old films manipulated and put togther using
different
coloured filters - it didn't work as they did it incorrectly.
It was a total flop due to a misunderstanding of those responsible about
3D.

Did you watch the recent C4 3-D with *blue/amber* (ColorCode) glasses as you
should have done?

(I agree it wasn't very good, but you've got to get the colours right for it
to work at all.)

--
Max Demian

Went to see Disney's A Christmas Carol last night at the proper Imax cinema,
giant floor to ceiling square's screen from 2 70mm films running
horizontally, in 3D, it was fantastic as they say in the adverts for proper
Imax... Crystal Clear and high powered sound.
They did not use the whole height of the screen but used the width so it was
the usual widescreen cinema format.
I can recommend you to go see this in today's 3D.
I may well go to see it in Digital Real 3D at the multiplex to compare.
Because of the effects in this film I would think the normal film
presentation would be a let down. The local multi-plex has the film on in
one screen as 3D and in another as 2D, they charge £2 extra for the 3D
usually, I assume for use of glasses or just to take more money as you only
get the loan of the glasses.

--
Regards,
David

FREESAT HD as it is now it is a joke.