Theo98
Eurasian Goldfinch
Something funny is going on in these threads. Let's not make it too complicated.
-some downplay or even ridicule the idea of 3D
-some say 3D in a roof is nonsense, thereby at least acknowledging the existence of 3D (!)
-some clearly see a marked 3D effect in the Noctivid 8x and a few other binoculars
I don't know what to say to the first group.
To the second group I can say: my Ultravid 8x42 is flat, so was my Trinovid 10x42. My Ultravid 10x50 has a marked Viewmaster 3D effect. How?
Some in the third group (Renze?) attribute 3D in the Noctivid to its high transparency. But how do you then explain that I see similar 3D in my 10x50 which is not so transparent as the Noctivid, more on par with my utterly flat Ultravid 8x42? For sure I think the transparency has something to do with it, but I think it's a combination of factors. See my previous post about distortion.
Anthon,
I've no doubt you see a more pronounced 3D effect in your UV 10x50's! I believe a good explanation maybe similar to why I see a substantial stereopsis effect in my 10X50 SV's.
At my IPD of 61mm, the EL 10x50 SV OPD is 70mm. Actually, at any IPD setting, the OPD is always 9mm+ greater. The UV 10X50 (and probably most 10X50's) have objective tubes that also provide a little wider light gathering capabilities due to their larger objective tubes (not true of most roofs). Also to me, their full EP of 5.0 delivers additional spatial clues that allow us to more easily interpret the width and depth of the view as our natural 3D vision does.
In the SV line up, the only EL that came close to what My 10X50 SV offers in 3D realism is the 8.5X42 (an EP of 4.9). The Noctivid 8X42 (EP of 5.25) seems to give most members greater 3D effect than the NV 10X42. Thus, a rational hypothesis of higher Exit Pupil diameters in addition to larger objective roof prism binos, assist some optics (to some viewers) in delivering greater visionary dimensional clues that we normally see unaided in the real world.
Porros, with their very wide offset OPD's, offer Viewmaster 3D type worlds while larger EP instruments generate brighter and greater-ease-of-view freedoms. Singularly or combined, for most viewers they do enhance the glassing experience.
Ted
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