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Adventures in stereo photography

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Post Options Post Options   Quote pegelli Quote  Post ReplyReply Direct Link To This Post Posted: 13 May 2021 at 19:55
Originally posted by Howard_S Howard_S wrote:


Here is an example of the Universal LR/RL view, with the crossover pair on the bottom row:
Hi Howard, I've never been able to do cross-eyed or free viewing but the good thing is that with my Loreo viewer both pairs of the stonehenge circle show in 3D for me, so as far as I'm concerned I'm ambivalent how you post your pairs.
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Post Options Post Options   Quote Howard_S Quote  Post ReplyReply Direct Link To This Post Posted: 14 May 2021 at 00:10
Ha, just my luck. The original was taken on a Fuji W3 stereo camera (two lenses, two sensors) and the subject is quite a few metres away, behind a rope. So perhaps the stereo effect is lessened, and the difference between LR and RL is reduced?

I tried a quick reprocessing of the original stereo MPO file and pushed the subject back in the frame (deeper on the z-axis) so those two stones at the front now look slightly further away and the sky is deeper in the frame too.

The bottom pair is flatter by comparison.



(Well, that's what I see!)
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Post Options Post Options   Quote bonneville Quote  Post ReplyReply Direct Link To This Post Posted: 14 May 2021 at 11:03
Originally posted by Howard_S Howard_S wrote:

I'd love to see the breakfast-cereal introduction to stereo viewing!

Here's mine. It is old and I haven't got many original cards but for 1'6d and the packet coupon it was a bargain   



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Post Options Post Options   Quote Howard_S Quote  Post ReplyReply Direct Link To This Post Posted: 14 May 2021 at 12:41
I looked on eBay and some Weetabix viewers with cards go for £10-£15 - that's up to 200x increase in value

A wise investment by the young Bonneville
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Post Options Post Options   Quote Miranda F Quote  Post ReplyReply Direct Link To This Post Posted: 15 May 2021 at 05:57
AHhhh, thanks, Bonneville! Gret to see it again. I'd forgotten it was Weetabix (one of very many things I've forgotten, I fear, )
Miranda F & Sensorex, Sony A7Rii, A58, Nex-6, Dynax 4, 5, 60, 500si/600si/700si/800si, various Sony & Minolta lenses, several Tamrons, lots of MF primes and *far* too many old film cameras ...
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Post Options Post Options   Quote Howard_S Quote  Post ReplyReply Direct Link To This Post Posted: 15 May 2021 at 18:53
So, back to a one-camera setup, and adapting the Micro Four Thirds Panasonic Lumix 3D lens (H-FT012) to a NEX-7 camera. My adaptor of choice is Blu-Tack, and the lens is adapted for close up with the insertion of a rubber ring or seal inside the lens. Ideal focus distance is about 10cm or 4 inches. A large lens hood helps reduce light leakage.

The lens is fixed focus and aperture (F12) and so with no moving parts is easy to adapt. This was never a great lens for normal stereo photography as the separation of the two lenses is so small. In fact, itís just right for subjects 10cm away ...

Here is the rig:



And here is the unprocessed image straight out of camera:



Finally, Stereo Photo Maker recognises this is a stereo pair and will split it into two images for alignment and processing. A key step is to swap the Left and Right images for viewing. SPM allows cropping to avoid the vignetting. This universal view provides LRL images and if you prefer parallel viewing choose the first two images, and for cross-over viewing use the centre and right image.


Bluebells in stereo 3D

Of course, Blu-Tack is no basis for a serious exploration of stereo photography with this lens, so I have ordered an MFT-to-E-mount adaptor for delivery tomorrow. That will take care of light leaks and improve the alignment of the stereo pair on the APS-C sensor.
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Post Options Post Options   Quote bonneville Quote  Post ReplyReply Direct Link To This Post Posted: 15 May 2021 at 20:40
The left and center work well for me in free view. I havenít got the glasses out to see them, even though I mysteriously received another (my third) pair of prismatic spectacles from the Stereoscopic Society today
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Post Options Post Options   Quote Howard_S Quote  Post ReplyReply Direct Link To This Post Posted: 16 May 2021 at 10:07
The munificence of the StereoSoc knows no bounds!

Here's another from yesterday's Blu-Tack shoot with the modified Panasonic lens; this one was processed on my iPad with i3DSteroid Basic (from the makers of SPM), doing a quick screen grab of the finished LR/RL view:


Garden tulip 3D - a sort of bee's eye view of the tulip head.

All I need now is to get an approaching bee to complete the picture ...
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Post Options Post Options   Quote pegelli Quote  Post ReplyReply Direct Link To This Post Posted: 16 May 2021 at 10:26
^^ With my Loreo viewer the top pair works much better than the bottom pair. A very nice capture!
You can see the April Foolishness 2021 exhibition here Another great show of the talent we have on Dyxum
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Post Options Post Options   Quote Howard_S Quote  Post ReplyReply Direct Link To This Post Posted: 16 May 2021 at 10:48
Originally posted by pegelli pegelli wrote:

^^ With my Loreo viewer the top pair works much better than the bottom pair. A very nice capture!

Thanks Pieter, that is as it should be; the bottom pair is for cross-over viewers like Miranda F.

Edited by Howard_S - 16 May 2021 at 11:44
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Post Options Post Options   Quote bonneville Quote  Post ReplyReply Direct Link To This Post Posted: 16 May 2021 at 11:41
Wow. Talk about VFM! Not only do I get a great 3D image to enjoy, but I also get to learn a new word munificence

Just a slight reduction of image size and the top pair work freeview perfectly. TFS Howard

I took my Fujifilm W3 with me to Twyford woods dog walk today to try and capture a particular tree. Hoping to process and post this afternoon.

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Post Options Post Options   Quote Howard_S Quote  Post ReplyReply Direct Link To This Post Posted: 16 May 2021 at 11:47
Thanks, Brian!

Next step when the M43 to E-mount adapter arrives is to look at how it goes with the A7 III ...
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Post Options Post Options   Quote Howard_S Quote  Post ReplyReply Direct Link To This Post Posted: 17 May 2021 at 00:25
And just to conclude this section with the 3D lens, the adapter arrived and here is the lens on the A7 III body:


A7 III with modified Lumix 3D lens

And a couple of quick samples


Cactus stereo 3D | LRRL: Parallel SBS at top, x-over below


Tulip stereo 3D | LRRL: Parallel SBS at top, x-over below

As a general note I set the APS-C crop on and used a large spot for metering, linked to the 'focusing' location (the lens is fixed focus with no electronic connection, but the A7 III will still allow you to position a focus and metering point). This way the amount of sensor with no light falling on it is not factored in to the exposure calculation.

The lens is 12.5mm focal length and on MFT systems it is described as 68mm equivalent for 35mm ... (x2 crop factor plus more for the reduced crop area of the separate images. I think this is unchanged in the FF situation, but if my thinking is muddled do shout!

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Post Options Post Options   Quote bonneville Quote  Post ReplyReply Direct Link To This Post Posted: 17 May 2021 at 11:32
Howard, you are progressing this genre well with yet another take on creating stereo images. TBH I struggled freeviewing the cactus pairs due to, I think, the tentacles in the foreground. Because I reduce the size of the screen image (it is much easier for the eyes to drop the centre image in) I suspect that my old brain was confused for a bit But they are all very good, and with the OWL at full size they are great.

I did say I was hoping to post views from my recent dog walk in the woods from the W3, however the phrase "RTFM" came to mind as I had it set to A3D (Advanced 3D) and didn't realise that I should have fired the shutter twice for each pair. So when I loaded them into SPM I had managed to get them jumbled into the wrong pairs. This isn't making a lot of sense so lets say I was hoping for AA BB CC DD etc I ended up with AB BC CD DE !! I suppose I could have tried to extract each image from the .MPO files but they weren't worth the effort and I put it down to experience. It has taught me not to assume I know what all the symbols are for and that purpose built stereoscopic cameras don't work the same as conventional ones

I have now read the manual and believe I have the modes sorted so I just need to have another trip out.
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