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Re: New 3D lens announced

Barry Aldous
 

Perhaps I should explain a few of things.  I am aware of and possess many of the options available  including those once produced by Cyclopital3D.  I personally use a Panasonic GX-7 with versions of the Lumix 3D lens and on occasions, a  Zeiss Stereotar 842.  The Stereotar out performs all other adapters I have tried, including those produced by Franc and Pentax. 

I also use a Canon 5D MkII with a home made stereo adapter, similar to that once produced by Kula, using 4 first surface mirrors.  I would suggest to Oktay that he follows the Kula route for the adapter, using a dedicated prime lens to match the camera.  The concept of extending the stereo base of the Lumix 3D lens is a non starter in my view.

Regarding Keystone distortion, I have found that SPM corrects this very well.  The bigger problem with all these adapters is the inherent narrow field of view - no wide angle potential.  Fortunately, we do have the Fuji W3 and Panasonic 3D1 to work with, if they can be found.

I shall be glad to answer any questions relating to twinned rigs and their synchronisation.

Barry A  


Re: New 3D lens announced

Depthcam
 

On Fri, Apr 2, 2021 at 04:12 AM, Barry Aldous wrote:
Extending the stereo base of a cameras with two lenses will result in a very large assembly

I'd like to point your attention to the Leitz Stemar and the Zeiss Stereotar C - both produced in the fifties by legendary manufacturers.  Both use a twin-lens module that mounts on a regular camera body and both feature a compact prism base extender for taking shots with a normal base.

I don't yet know exactly what Oktay has in mind.  But I know that OKtay has experience with 3D camera and 3D lens design that spans many decades. I use to correspond with him back in the eighties when he showed me several custom 3D lenses and cameras of his own creation.  So I remain curious to see what he will come up with.

Stereo converters for single lenses (unless they reorient the optical axis for head to head recording) introduce strong opposite keystone distortion; so I avoid them altogether.

The goal of using a stereo adapter is seldom to replace a stereo camera or rig.  It is primarily a matter of convenience.  For example, many people here use the Lumix 3D lens for close-ups.  If they could carry along a simple lightweight adapter, they could use the same camera and optics for the occasional normal range shot.  That may be what Oktay has in mind - or not.   I don't know yet.

Let's wait till Oktay has shown us his prototype before jumping to conclusions.

Francois


Re: New 3D lens announced

Barry Aldous
 

There seems to be some confusion here.  Extending the stereo base of a cameras with two lenses will result in a very large assembly and a very limited focal length with a small FOV.  I have done experimental work, extending the the stereo base of the Panasonic 3D1 using 4 mirrors; this worked to some extent but is not very useful.  Cyclopital3D produced a base extender for the Sony TD10 camcorder; this gets as close to filling the requirements, but is still very limited.  Having built several 'Beamsplitter' rigs for single lens cameras, I find this to be the most satisfactory option, Alternatively, twinning cameras provides the ultimate solution if you master the synch issues!

Barry A


Re: New 3D lens announced

Depthcam
 

> I am doing it with the Lumix 3D lenses.


Do you mean that you are making a base expander that will fit the Lumix 3D lens without any modification of the lens or do you need to replace the entire front section of the Lumix lens in order to fit your adapter ?

Francois


Re: Rokit 3D phones

Bob Aldridge
 

Yes. I can confirm this. In addition it has two separate sim sockets and a micro SD card socket, so it can be used as dual sim at the same time as have storage on a micro SD card. That's pretty rare even in 2D phones!

Sadly, the rest of the phone isn't particularly good. I was using one during the Akron NSA convention and all too often couldn't get a phone signal let alone 4G data (it's a US spec phone - the UK spec phone does 4G in Europe but not in the USA and vice versa for the US spec phone)

So it sits in a drawer most of the time...

Bob Aldridge

On 01/04/2021 23:35, robert mcafee via groups.io wrote:
I believe the Rokit io 3D (not io Pro 3D) has a user replaceable battery. Someone in England on this group reported they had to install the battery in that phone when purchased.  I do not have personal experience with that model to confirm. Also it is lower resolution than the Pro model


Re: Rokit 3D phones

robert mcafee
 

I believe the Rokit io 3D (not io Pro 3D) has a user replaceable battery. Someone in England on this group reported they had to install the battery in that phone when purchased.  I do not have personal experience with that model to confirm. Also it is lower resolution than the Pro model


Re: New 3D lens announced

Oktay
 

On Thu, Apr 1, 2021 at 01:33 AM, Depthcam wrote:
>>something that Panasonic should have done with their Lumix 3D lens.<<
I am doing it with the Lumix 3D lenses.
Attached is a photo of work in progress. Had to go back to the drawing board.

Oktay


Re: My Handy-Dandy Boy Scout Compass

 

I can measure horizontal field of view with my hand-dandy Boy Scout compass from inside a padded cell:
https://stereopix.net/photo:bYKy3nJdqZ/


Re: My Handy-Dandy Boy Scout Compass

 

On Thu, Apr 1, 2021 at 12:03 PM, Roger Maddy wrote:
https://youtu.be/kMYYuqFmLG0
Sorry it's kinda dark at sunset.
Let me know if you need a brighter demo, and I'll find a spot earlier in the day.

Hope this helps.


My Handy-Dandy Boy Scout Compass

 

Here's how I use my handy-dandy Boy Scout compass on my cell phone for estimating horizontal field of view:
https://youtu.be/kMYYuqFmLG0


Re: Rokit 3D phones

DaveJes1979
 

My Red Hydrogen is starting to get a little long in the tooth.  I hope you're right, I'd be eager to upgrade to a new stereoscopic camera phone within the next few months.

While the Hydrogen has a very large battery, it is still difficult to push a phone past 2 years of service, 3 max. Since there are almost no phones being made with interchangeable batteries anymore, that is the limiting component.


Re: Stereopix.net: Happy birthday

JackDesBwa|3D
 

Happy birthday to Stereopix again!
It is its second anniversary.

The website currently hosts 1194 photos thanks to 86 registered users (a few have not published yet).
In addition, we should thank the 24 people who gave a tip (or several tips for some of them) since the launch to help me in this project, as well as those who helped me to test some functionalities or bug fixes.

Here is a map of the connections to Stereopix in 2020: (extracted from the animated version https://youtu.be/RzEQpTHCiKQ)
- red: an image was published
- green: possibly a human
- orange: looks like a robot
Like for the image of last year, the positions are estimated from the IPs and might be wrong.
geoip_2020.jpg

And the more or less filtered traffic over the 2nd year: (a lot of robots and suspicious traffic removed from the graph)
visits.jpg
I will renew the rent of the server at the end of the month.
There are still tons of improvements in my head, but I have to find time to implement them.

Happy sharing on Stereopix.

JackDesBwa


Re: New 3D lens announced

Depthcam
 

> I am in the process of designing and building a stereo lens system


This reminds me of the Leitz Stemar or the Zeiss Stereotar C:  Twin lenses occupying the space of a single lens coupled with a prism adapter to widen the base - something that Panasonic should have done with their Lumix 3D lens.

It also is reminiscent of the several incarnations of the Loreo lens for DSLRs.  Are you working on something along the same lines ?

Francois


Re: Rokit 3D phones

Depthcam
 

There are most likely 3D products in the works that will surprise many.

Francois


Re: You're In Virtual Reality (Like It Or Not)

 

"What Do You Do With A Cell Phone?"
 


Re: Rokit 3D phones

John Clement
 

But if you take a 3D picture, turn it into a Holmes card, and then view it is a Holmes viewer there is NO ghosting. I have never seen ghosting when I freeview SBS images.  So yes, all of the items in the list are true, and all are related to the method of viewing.  I pointed out the characteristics of images that are prone to look ghosted.   Some methods of SBS viewers such as Holmes viewers, View-Master, Realist format…. VR viewers have no ghosting, so it is in the presentation method that allows one side to bleed slightly into the other.  Supposedly the Dolby system that splits each color into R/L bands has much less ghosting.  Also the linear polarization method has been claimed to have less ghosting than the circular polarization.  The Shutter methods have ghosting if the screen has some persistence, or if the shutter does not perfectly overlap with the screen.  Even when black the shutter may will let some light through which also causes ghosting.  The diddling with the image just makes ghosting less obvious, but some bleed is still there.  And then there are the 3D presentation devices that are poorly designed such as the Rembrandt that I tried and returned.  Some people are much more sensitive to ghosting, which is also in the viewing and not the original image.

 

Of course the non-ghosting viewing methods have their problems such as poor lighting, reflections on the prints, or inability to converge free-views.  Digital copies of film never look exactly the same.  Printed SBS 3D viewed using lorgnette viewers will have distortion and color fringing, but no ghosting.

 

The author of the original article seemed to think the ghosting was in the image, while it really was in the presentation system that allows bleeding between the R/L images.  At present it is not physically possible to have a screen viewing system either with glasses or glasses free without some bleed through, but the pro movie producers have done a fairly good job of flattening the brightness range when it makes the ghosting obvious, or by changing the depth so the object of interest is near to the plane of the screen.  The images always have to be compromised.  A little light in your viewing room can also make ghosting less obvious.

 

John M. Clement

 

From: main@Photo-3d.groups.io <main@Photo-3d.groups.io> On Behalf Of Dariush Radpour via groups.io
Sent: Tuesday, March 30, 2021 12:58 PM
To: main@photo-3d.groups.io
Subject: Re: [Photo-3d] Rokit 3D phones

 

"Ghosting is caused by the viewing system, not the photograph.  The author complains of ghosting, but I would submit that viewing an SBS print in a Holmes viewer or in a good VR headset would get rid of the ghosting.  The Mickey photo would pose problems if it were displayed on a large screen, so the solution is to have the horizontal alignment adjusted to prevent wide separation of the background.  Mickey might then pop out.  Ghosting is obvious when you have images with very high contrast between light and dark areas with wide horizontal separation between L&R.  That is why the author saw ghosting in the car and Mickey images."

 

The ghosting problem is a very complex issue and depends on the endless factors!

It depends on your screen color set-up 

it depends if your ana-glasses are matched with your screen set-up

it depends if your printer's set-up is matched with your glasses

it depends on your experience to avoid too much strong light and shade contrast zones in your image close to each other and..

it depends that you kow how to use the de-ghosting method with photoshop.

 

cheers to all,

 

Dariush

 


You're In Virtual Reality (Like It Or Not)

 

Let's see if I can communicate with people in virtual reality via my cell phone.
I'll start with Janice:

https://youtu.be/v3TJpDriyFw


Re: Rokit 3D phones

Dariush Radpour
 

"Ghosting is caused by the viewing system, not the photograph.  The author complains of ghosting, but I would submit that viewing an SBS print in a Holmes viewer or in a good VR headset would get rid of the ghosting.  The Mickey photo would pose problems if it were displayed on a large screen, so the solution is to have the horizontal alignment adjusted to prevent wide separation of the background.  Mickey might then pop out.  Ghosting is obvious when you have images with very high contrast between light and dark areas with wide horizontal separation between L&R.  That is why the author saw ghosting in the car and Mickey images."

The ghosting problem is a very complex issue and depends on the endless factors!
It depends on your screen color set-up 
it depends if your ana-glasses are matched with your screen set-up
it depends if your printer's set-up is matched with your glasses
it depends on your experience to avoid too much strong light and shade contrast zones in your image close to each other and..
it depends that you kow how to use the de-ghosting method with photoshop.

cheers to all,

Dariush


Re: HTML5 Gallery via SPM

ron labbe
 

It happened to me also, when opening the web site as a local file (file://***). Everything went well when opening the same page uploaded to a remote server. Also when running locally using a local http server.

The reason is a very counterintuitive security issue: It is safer to open a remote site than one in your own computer (do not ask me to explain why:-)
Yes, that was it. Also had to change thumbnail .JPG to lowercase, as "thvandam" mentioned. That is an odd glitch! Thanks again to all who chimed in.


Re: HTML5 Gallery via SPM

ron labbe
 

Are you trying to run it locally, on a lap top or desk top? If so you will find that it works correctly when uploaded to a server.  
BINGO! Thanks, Harold... THAT is the correct answer... uploaded to my remote server and all looks fine. No wonder your Burning Man site still looks great :) https://3dculture.com/bm3d/2019/2019h_m.htm

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