I'm going back into production on my Medium Format viewers. Please visit http://www.freewebs.com/larryeda/

Kind regards,

Larry Heyda 919-793-4542



---- "blackice@pavilion.co.uk [MF3D-group]" <MF3D-group@yahoogroups.com> wrote:

> Links, prices and recommendations please.
>
>
> I see one I don't recognise in the photos but not had any luck tracking it back to the maker.
>
>
> Cheers
>
>
> M

On 4/2/2017 2:58 AM, blackice@pavilion.co.uk [MF3D-group] wrote:

> Links, prices and recommendations please.
>
> I see one I don't recognise in the photos but not had any
> luck tracking it back to the maker.

You're gonna have to explain again what a 120mm slide is. Is
it a stereo pair, shot on 120 _format_ film, crammed into a
6x12cm mount? Or maybe it a 6x12cm image, being one half of a
panoramic stereo pair? Or maybe it is a landscape-oriented
image from a 4x5? For none of those cases am I aware of an
off-the-shelf stereo viewer.

If what you mean is a stereo pair shot on 120 format film,
mounted in an 80x140mm or 80x132mm plastic or cardboard
holder, then you have two options.

Holga makes a viewer.
https://shop.lomography.com/en/holga-3d-slide-viewer
If it is anything like their mounts, it is utter crap and
should be actively avoided.

Larry Heyda makes a viewer.
http://www.freewebs.com/larryeda/
I have one, and consider it to be a gem. They are not
inexpensive, but they are excellent and highly recommended.

These are, as far as I know, the only two options.

--
John Thurston
Juneau, Alaska

John Thurston wrote:

>
> Holga makes a viewer.
> https://shop.lomography.com/en/holga-3d-slide-viewer
> If it is anything like their mounts, it is utter crap and
> should be actively avoided.

I have viewed some of my cardboard mounted MF3D slides in a Holga
viewer at Photo Plus East.

The Holga viewer is not as bad as their mounts. It's probably better
than the plastic lorgnette viewer I used when I first got into stereo
photography.

--
Brian Reynolds | "It's just like flying a spaceship.
reynolds@panix.com | You push some buttons and see
https://www.panix.com/~reynolds/ | what happens." -- Zapp Brannigan
NAR# 54438 |

I have no idea if worthwhile, but it will be certainly fun to try. I'm going to buy a cheap VR headset (the kind people use for smartphones), take it apart and see if I can adapt it for viewing MF3D.. Even cheap ones often can vary interocular and focus distance. Perhaps I can even fit in some decent lenses I got from Edmond Optics.

Not a bad idea. I did the reverse, taking a 3DWorld STL viewer and converting it to view stereo images with my Sony phone.

First experiments with a very cheap VR headset. Maybe a little surprising but the lens are not bad at all, and very big, maybe 35mm. Focussing knob and also inter-ocular adjust. A bit of fussing required to get the slide plane at the correct distance (I fashioned kind of a spacer out of a rubber mat, sort of a yoga mat affair). But there is a focus adjustment. The whole thing is ugly as sin, but it works OK. Moreover, a cheap gift for friends of whom you've taken a couple pics for them to view and keep. Cost was well under 20 bucks, maybe 15 from one of those Hong Kong places, DX or whatever. I could check. The name on the viewer was VR Shinecom

> First experiments with a very cheap VR headset.

For true VR use, headsets will use very high magnification lenses that also cause strong pincushion distortion.  However, some of the VR headsets on eBay use longer lenses (about 75mm) that have less pincushion distortion and therefore could work with MF slides.

But you're still left with having to design a contraption that can easily hold the slides at the proper distance and then there is the matter of an adequate diffuser at the back...

Francois

>> there is the matter of an adequate diffuser at the back<<

One could use a phone (with pure white full image in gallery mode)
display as a very expensive, very even brightness and temperature
controllable light source.

--
ron labbe
studio 3D

Ron

Indeed, my experiments with VR headset are disappointing. The biggest disappointment was the lens. Very unacceptable pincushion (as was pointed out before).  If I can manage to extract the originals I will try to replace with Edmond Optics (of which I have a few laying around, roughly 75mm FL).

The scannable QR codes on most nicer VR viewers configures the inter-ocular for the phone's screen size and may pre-distort the stereo pairs to compensate for the particular lens' distortion. (in theory, kind'a like the Wide-angle LEAP stereo camera/viewer combo).