Starship Asterisk*

by **Jim Leff** » Sat May 21, 2016 7:34 pm

What finally worked for me is a bit of a "duh", but it took me a while to figure it out so I'll share: don't worry about the image for a moment. Just make cross-eyes. Then look at the image. Voilà .

by **Tekija** » Sat May 21, 2016 11:46 am

http://www.sunflower-astronomy.com/inde ... mages.html

http://www.para-az.com/electric-sun/stereo-pairs/

by **masodo** » Sat May 21, 2016 3:02 am

Chris Peterson wrote: Actually, either is pretty relaxed with practice. The advantage of cross-eyed viewing is that you can cross your eyes a lot, but most people can't get their eyes farther apart than parallel (it's difficult or impossible to go wall-eyed, with your eyes both pointing outward). The consequence of this is that you can look at very large images with your eyes crossed, but are generally limited to small images (such that their centers are no wider than your eye spacing) for parallel viewing.

I am practicing my crossed-eye viewing and it is getting easier but I do feel more tense doing it that way for some odd reason. Perhaps after a couple of adult beverages it would feel more natural

So I guess the rule is: if your stereo pairs are presented 3 inches on center (or less) they should be assembled for parallel viewing (Stereopticon compatible) and larger images would naturally call for cross-eyed viewing.

This image when viewed - resized and - using "parallel eyes" was not very impressive - of course when I discovered the actual method of presentation and made the adjustment, the result was quite the spectacle. Many thanks to Stefan Seip for this commemorative work of art

by **Chris Peterson** » Sat May 21, 2016 1:32 am

masodo wrote:Parallel viewing is relaxing and can be done for hours on end without the eyestrain associated with cross-eyed freeviewing.

Actually, either is pretty relaxed with practice. The advantage of cross-eyed viewing is that you can cross your eyes a lot, but most people can't get their eyes farther apart than parallel (it's difficult or impossible to go wall-eyed, with your eyes both pointing outward). The consequence of this is that you can look at very large images with your eyes crossed, but are generally limited to small images (such that their centers are no wider than your eye spacing) for parallel viewing.

by **SometimeStarviewer** » Sat May 21, 2016 12:18 am

A quick way to check whether the images are reversed is to mentally consider the line of sight from each eye. Lines drawn from your eye through Mercury to the Sun's surface will intercept that surface farther to the left for the right eye and farther to the right for the left eye. The eye to the right will see Mercury closer to the left limb, and the eye to the left will see Mercury farther away. Those intersections will be the perceived position of Mercury against the Sun's disk. As you can see from the two images here, the distances are reversed.

Another hint on this is that the bottom text was designed so that the large end is closer and the small end farther away when your eyes are crossed. The 3D effect for the images as presented is the opposite: the larger end is farther away, and the smaller end nearer.

by **masodo** » Fri May 20, 2016 6:25 pm

tomatoherd wrote:Masodo:

I never had trouble w the Magic Eyes images. But I can't get the older stereograph images on your blog to superimpose, even w a sheet of paper from my nose down to the division between them on computer screen.
It may be a distance thing: on Magic eyes, the distance between images in less than an inch and a half. On the old stereographs, it's about 3 inches on center.
what'd'you think?

If you are not used to freeviewing stereo pairs those may be rendering too wide.
Try doing a ([Ctrl] + "-") or otherwise zoom-out to get a comfortable width.

If you can do Magic-Eyes you should have no trouble with these once you get "dialed-in"

Thanks for stopping over, tomatoherd!

by **tomatoherd** » Fri May 20, 2016 5:52 pm

Masodo:

I never had trouble w the Magic Eyes images. But I can't get the older stereograph images on your blog to superimpose, even w a sheet of paper from my nose down to the division between them on computer screen.
It may be a distance thing: on Magic eyes, the distance between images in less than an inch and a half. On the old stereographs, it's about 3 inches on center.
what'd'you think?

by **NRCarlson9721** » Fri May 20, 2016 5:47 pm

pferkul wrote:
Jim Leff wrote:Can someone please post the reversed images? Perhaps to Imgur, or other free easy image upload service?
Here are the images swapped left and right for viewing using the parallel technique (focus eyes far away).

Great- Thanks. The reversed images work much better for some reason. I use the "free viewing" technique often, but that's the first time flipping the images made such a big difference. I'll have to keep that in mind.

Norm

by **masodo** » Fri May 20, 2016 4:16 pm

I have trouble with cross-eyed viewing and edited to add to my collection of parallel viewing images. (should have looked here first)

Parallel viewing is relaxing and can be done for hours on end without the eyestrain associated with cross-eyed freeviewing.
I do appreciate that cross-eyed freeviewing makes it possible to view larger images but I am afraid someone will come up behind me and hit me in the back and my eyes would stay that way

I did a Blog on freeviewing - if you would like some help with parallel viewing:
http://blogdogit.com/article.php?story= ... 1134210875

by **aildoux** » Fri May 20, 2016 3:17 pm

Worked for me. Thanks.

by **bigbaldjoe** » Fri May 20, 2016 3:06 pm

There is another tick to help you see these. If you were to put a piece of clear glass in front of one of these images and focus on your reflection in the glass it helps some people see the 3d image.

by **pferkul** » Fri May 20, 2016 2:57 pm

I made a video of the moon crossing in front of the Earth using a similar technique:

Click to play embedded YouTube video.

by **pferkul** » Fri May 20, 2016 2:55 pm

Jim Leff wrote:Can someone please post the reversed images? Perhaps to Imgur, or other free easy image upload service?

Here are the images swapped left and right for viewing using the parallel technique (focus eyes far away).

by **Jim Leff** » Fri May 20, 2016 2:27 pm

Can someone please post the reversed images? Perhaps to Imgur, or other free easy image upload service?

by **zendae** » Fri May 20, 2016 2:09 pm

That was so spectacular that we need to have more. As 3D as it gets! How about the Jupiter and Saturn families?

by **Mulecanter** » Fri May 20, 2016 1:53 pm

My first time looking at a cross eyed 3D image--it really works!! and I don't have to wear silly glasses. I wonder if viewing Mercury's transit from our vantage gives any 3D effect since the distant is so great--shouldn't it appear 2D? Is this an artificial view?

by **MadMan** » Fri May 20, 2016 1:51 pm

OK, here's the scoop. http://www.pikespeakphoto.com/viewing3d.html explains that there are two ways to free view 3D image pairs. I have always used the parallel method. The other method, cross-eyed, is new to me. Cross-eyed viewing allows for larger images. I may try to "get" cross-eye viewing. It's definitely harder and feels less natural.

by **ThingFish** » Fri May 20, 2016 12:55 pm

For those having trouble seeing the image, I suspect it's because you are trying to "uncross" your eyes, or move them as if to focus on more distant objects. For this pair you need to *cross* your eyes, moving them as if to focus on closer objects. I had the same problem at first.

by **MadMan** » Fri May 20, 2016 12:24 pm

I agree with SometimeStarviewer. The 3D didn't work for me until I reversed the position of the images in MS Paint.

by **heehaw** » Fri May 20, 2016 8:41 am

Thanks, interesting! I'm usually pretty good at crossed-eye 3D, but .... the lettering at the bottom is PERFECT 3D for me, really striking! But Mercury does NOT leap out at me, at all, it just looks like another sunspot. Puzzled! But nice try, I like the attempt.

by **Boomer12k** » Fri May 20, 2016 7:50 am

Oh GREAT.... now my EYES ARE STUCK.....

Nice Work...
:---[===] *

by **philiparnold** » Fri May 20, 2016 7:38 am

Are you sure that you are not just trying to see how many of us will sit in front of our screens cross-eyed (it worked on me) my daughter came to see what was wrong with me

by **Guest** » Fri May 20, 2016 6:57 am

I tried it and it didn't seem to work. The image kept jumping around and the horizontal alignment was critical. Then, after a beer, the image popped out very clearly, altho still careful alignment was needed. Great image pair.

by **SometimeStarviewer** » Fri May 20, 2016 6:34 am

By my eyes, the left and right images are reversed in this image. I used a graphics program to exchange the left and right images, and the 3D effect appeared. (Either that, or my optic nerves have reversed themselves!)

by **Peter Clark** » Fri May 20, 2016 5:47 am

Peter Clark wrote:Please let's have more crossed eye 3D imagery! This is a marvellous pair, Mercury appears so vividly forward of the Sun and the captions appearing at 90 degrees to each other is a special treat!

Starship Asterisk*

APOD: 3D Mercury Transit (2016 May 20)

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