Date   

Re: Phorlorn Phereo Phailed

JackDesBwa|3D
 

Phereo has failed again.  Website seems to be down.
Apparently, the SSL certificate for the server hosting the images was not renewed (expired about 3-4 days ago).
I changed https://phereo-unofficial.stereopix.net/ to ignore this misused security feature too.

but there are still features of Phereo I like.
JFI, which feature in Phereo is missing in Stereopix for you?

JackDesBwa


Doritos...

toychinook
 

 Doritos this year is launching a new product: "3D crunch" on the Super Bowl stage with help from A-List celebs...

And the only glasses you will need will be for an accompanying beverage !


Re: New 3D lens announced

Etienne Monneret (Perso)
 

I find a diagram that may help to understand (the scale is not ideal, but it could be sufficient):
  • TOP: all the light rays coming from one point though the lens, supposed point 1, is sent to a single point of the picture (when focused).
  • MIDDLE: if you have a diaphragm (or a mask) very very close to the lens (ideally inside the lens system), you are reducing the light rays, keeping the whole scene with less light. You have an aperture diaphragm (or mask).
  • BOTTOM: if your diaphragm (or a mask) is far from the lens (according to its size), you simply hide all the light of a part of the scene (suppose you are hiding all the light from point 1), keeping the light of the other part of the scene (suppose point 2 and 3). You have a field diaphragm (or mask).
To be able to do stereo shots, you need your mirrors to act like 2 complementary field masks...


Re: New 3D lens announced

Etienne Monneret (Perso)
 

Antonio,

I think you are confusing "aperture diaphragm" with "field diaphragm".

With the mirrors being in front of the lens, you get a field-diaphragm-like effect: you are cutting the scene.

To get an aperture diaphragm, reducing the amount of light for the whole scene, you need to be inside to lens system:


Le 15/04/2021 à 07:41, Etienne Monneret (Perso) a écrit :
Le 14/04/2021 à 23:03, Antonio F.G. via groups.io a écrit :
On Wed, Apr 14, 2021 at 01:49 PM, Depthcam wrote:
If sets of mirrors placed at perfect 45 degree angles are placed in front of a single lens, all they do is divide the scene into two.  One side of the scene on one side and the other side of the scene on the other. 
NOOOO, the image is not divided in two sides. What is divided in two parts is the aperture of the lens. Each mirror alone takes the complete image, only with half the available light.

So... can you explain why I get this when my finger is in front of my lens, like the mirrors ? Shouldn't I get the same full image with less light ?




Re: New 3D lens announced

Etienne Monneret (Perso)
 

Le 14/04/2021 à 23:03, Antonio F.G. via groups.io a écrit :
On Wed, Apr 14, 2021 at 01:49 PM, Depthcam wrote:
If sets of mirrors placed at perfect 45 degree angles are placed in front of a single lens, all they do is divide the scene into two.  One side of the scene on one side and the other side of the scene on the other. 
NOOOO, the image is not divided in two sides. What is divided in two parts is the aperture of the lens. Each mirror alone takes the complete image, only with half the available light.

So... can you explain why I get this when my finger is in front of my lens, like the mirrors ? Shouldn't I get the same full image with less light ?



Re: Micro Lens Technology is closing - supplier of 3D Lenticular sheets

Mike Brown
 

I'm not aware of any practical limited shelf life of the material. I think for indoor applications the material would be fine for decades.


Re: Micro Lens Technology is closing - supplier of 3D Lenticular sheets

robert mcafee
 

I may like to try lenticular s in the future but I am not doing this now. Is there a shelf life for the material?


On Wed, Apr 14, 2021 at 7:27 PM, Mike Brown via groups.io
<dighal@...> wrote:
In case you haven't heard, Micro Lens Technology is closing. Micro Lens produced and sold some of the finest thick lenticular sheets for self printed 3D lenticulars. If you are looking to purchase some sheets, they have them on sale for the next two weeks before they close. Now would be a good time to stock up. Their products are unique and there isn't another good supplier of similar thick PET sheets in the United States. For self printed inkjet lenticulars, I suggest you get either their 40 LPI or 60 LPI material. See their letter below:

This letter is to inform you that Micro Lens Technology will be ceasing all business operations on April 30, 2021.  We appreciate all of our valued customers for the business and personal relationships we have built over the years.  When our founder Ken Conley started Micro Lens in his home basement in 1996, he had a vision of bringing 3D technology to the world.  He wanted this technology to be appealing, affordable and accessible to the marketplace.  You helped Micro Lens achieve that vision and rise to be a leader in the lenticular community.
 
We will be liquidating all remaining lens material that we have in stock at special discounts.  Contact Jim Owens for pricing and availability.  All sales will be final, no returns or exchanges, and payment must be received before shipping.  Orders will be taken through 4/28/21. Please note that Micro Lens will be closed 4/2/21-4/8/21 for Easter vacation. 
 
It has truly been a pleasure working with each of you.  Thank you so much for your support!

Sincerely,
 
Mary Ellen Conley
President
 
James Owens, Jr.
Director of Sales


Micro Lens Technology is closing - supplier of 3D Lenticular sheets

Mike Brown
 

In case you haven't heard, Micro Lens Technology is closing. Micro Lens produced and sold some of the finest thick lenticular sheets for self printed 3D lenticulars. If you are looking to purchase some sheets, they have them on sale for the next two weeks before they close. Now would be a good time to stock up. Their products are unique and there isn't another good supplier of similar thick PET sheets in the United States. For self printed inkjet lenticulars, I suggest you get either their 40 LPI or 60 LPI material. See their letter below:

This letter is to inform you that Micro Lens Technology will be ceasing all business operations on April 30, 2021.  We appreciate all of our valued customers for the business and personal relationships we have built over the years.  When our founder Ken Conley started Micro Lens in his home basement in 1996, he had a vision of bringing 3D technology to the world.  He wanted this technology to be appealing, affordable and accessible to the marketplace.  You helped Micro Lens achieve that vision and rise to be a leader in the lenticular community.
 
We will be liquidating all remaining lens material that we have in stock at special discounts.  Contact Jim Owens for pricing and availability.  All sales will be final, no returns or exchanges, and payment must be received before shipping.  Orders will be taken through 4/28/21. Please note that Micro Lens will be closed 4/2/21-4/8/21 for Easter vacation. 
 
It has truly been a pleasure working with each of you.  Thank you so much for your support!

Sincerely,
 
Mary Ellen Conley
President
 
James Owens, Jr.
Director of Sales


Is There A Perfect Size For A 3D Wristwatch?

 

Now that we have 3D wristwatches, what's the perfect size for one?
 


Re: New 3D lens announced

Antonio F.G.
 

On Wed, Apr 14, 2021 at 01:49 PM, Depthcam wrote:
If sets of mirrors placed at perfect 45 degree angles are placed in front of a single lens, all they do is divide the scene into two.  One side of the scene on one side and the other side of the scene on the other. 
NOOOO, the image is not divided in two sides. What is divided in two parts is the aperture of the lens. Each mirror alone takes the complete image, only with half the available light.

Regards
    Antonio


Re: New 3D lens announced

Etienne Monneret (Perso)
 

Le 14/04/2021 à 20:49, Depthcam via groups.io a écrit :
I don't know why it's so hard for people to get it.   I hope your drawings help make that clear.
On my side, such splitters didn't really catch my attention before today. I didn't think a lot about how they are working, and I didn't carefully read the exchanges on that subject... till this drawing I made to understand by myself.

;-)


3D Wristwatch For Area 51 Aliens

 

I think I am the first Area 51 Alien with a real, working 3D wristwatch, but IMHO every Area 51 Alien should get one:
 


Re: New 3D lens announced

Depthcam
 

On Wed, Apr 14, 2021 at 10:27 AM, Etienne Monneret (Perso) wrote:

I think I got it...

TOP: the first set of 2 mirrors is splitting the picture in 2 complementary parts.

MIDDLE: the second set of 2 mirrors is providing with the stereo-base. If the set of 4 mirrors is exactly configured to be 2x90° angles, you get 2 halves of the scene with no overlapping.

BOTTOM: to get the stereo with 2 views overlapping the same part of the scene, you need to toe somewhere in the montage...



Yes, Étienne.  This is what I have been saying all along.  If sets of mirrors placed at perfect 45 degree angles are placed in front of a single lens, all they do is divide the scene into two.  One side of the scene on one side and the other side of the scene on the other.  The only way for such a device to record the same part of the scene is to converge the front mirrors towards the subject and thus, introduce opposite keystone distortion.  But I said all that before and others have confirmed it.  I don't know why it's so hard for people to get it.   I hope your drawings help make that clear.

Of course it's not the same if two lenses are used because then, the 45 degree mirror assembly acts as a periscope and widens the base.

Francois


Re: New 3D lens announced

timo@guildwood.net
 

Two lenses is the ideal for this mirror arrangement. This is why the Zeiss Stereotar had two lenses. It also had a septum that reached almost to the film plane, to reduce overlap of the left and right images.
Timo

On Apr 14, 2021, at 11:27 AM, Etienne Monneret (Perso) <ab3d@...> wrote:

Le 14/04/2021 à 16:40, timo@... a écrit :
Good point. The diagram should show the rays striking different parts of the sensor, thus creating stereo.

I think I got it...

TOP: the first set of 2 mirrors is splitting the picture in 2 complementary parts.

MIDDLE: the second set of 2 mirrors is providing with the stereo-base. If the set of 4 mirrors is exactly configured to be 2x90° angles, you get 2 halves of the scene with no overlapping.

BOTTOM: to get the stereo with 2 views overlapping the same part of the scene, you need to toe somewhere in the montage...

<hjgfkahcllfgngfp.png>

This is not the same problem if the camera holds 2 complete lenses, providing each with a complete view of the scene, before the set of mirrors, like this:




Re: New 3D lens announced

Etienne Monneret (Perso)
 

Le 14/04/2021 à 16:40, timo@... a écrit :
Good point. The diagram should show the rays striking different parts of the sensor, thus creating stereo.

I think I got it...

TOP: the first set of 2 mirrors is splitting the picture in 2 complementary parts.

MIDDLE: the second set of 2 mirrors is providing with the stereo-base. If the set of 4 mirrors is exactly configured to be 2x90° angles, you get 2 halves of the scene with no overlapping.

BOTTOM: to get the stereo with 2 views overlapping the same part of the scene, you need to toe somewhere in the montage...

This is not the same problem if the camera holds 2 complete lenses, providing each with a complete view of the scene, before the set of mirrors, like this:



Re: New 3D lens announced

timo@guildwood.net
 

Good point. The diagram should show the rays striking different parts of the sensor, thus creating stereo.

Timo

On Apr 14, 2021, at 10:31 AM, Etienne Monneret (Perso) <ab3d@free.fr> wrote:

Le 14/04/2021 à 16:01, Antonio F.G. via groups.io a écrit :
But all lens distortions do no change the fact that a single image point is not enough for an stereo-photographer.
Yes. The schema is not good on that. As I understand it, the first set of mirrors is splitting the shot in 2 parts. Rays coming from each input mirror can't reach at the same final point.







Re: New 3D lens announced

Etienne Monneret (Perso)
 

Le 14/04/2021 à 16:01, Antonio F.G. via groups.io a écrit :
But all lens distortions do no change the fact that a single image point is not enough for an stereo-photographer.
Yes. The schema is not good on that. As I understand it, the first set of mirrors is splitting the shot in 2 parts. Rays coming from each input mirror can't reach at the same final point.


Re: New 3D lens announced

Antonio F.G.
 

On Wed, Apr 14, 2021 at 12:38 AM, Etienne Monneret (Perso) wrote:

The mistake is in your "parallel rays from infinite point":

If this would be true, you would always take a scene of few cm2 whatever the distance of the scene, and you would be able to put your mirror at whatever distance you want in front of your lens.

The drawing does not show a scene "of few cm2", the scene is a SINGLE point at infinity (say, a star) that sends a bunch of parallel rays (they are parallel because the point is at infinity). The lens (if it is an ideal lens) focus the parallel rays in a SINGLE image point placed in the focal plane.

This happens without mirrors.
And it happens almost the same with a set of mirrors exactly at 45°. The only difference is Alpha Centauri will appear a few cm away:-).


Well, my knowledge of optics does not reach much further. I can not discuss the distortion effects of real lenses, incoming angles, distance to the scene et al. But all lens distortions do no change the fact that a single image point is not enough for an stereo-photographer. For stereo we want two points.

Regards
    Antonio


3D Webcam For Zoom Meetings

 

If anyone wants to use this 3D webcam with Masuji Suto's HTML5 3D WEB Cam app (e.g., for Zoom meetings), I'm getting it to work with an input resolution of 2560,960 with minimal frame drops, and I'm also getting it to work with Stereoscopic Player.


Re: Lume Pad Lightfield 3d tablet

Ian Walker
 

Assume this display is similar to a large-format version of the display on the RED Hydrogen One and will display images taken with that phone in a similar manner? (The website doesn't mention this?) 

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