P3D Re: 3153 Mark Dottle & Moderate Hyperstereos

["Ray Moxom" <raymoxom@xxxxxxxxxxx>]

SEPARATE THOSE XA2s MARK!
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In P3D-3153 Mark Dottle < markaren@xxxxxxxxx> wrote:

>Dr. T is of the opinion that 120mm separation would 
>make little difference if 65mm were not enough. I'm 
>not sure I understand this. wouldn't the desired 
>result depend on the nearest object distance? For 
>example, using my Realist I took a photo of the city 
>with 2 trees as nearest objects (trees approx. 50 
>yards away)

If the closest object was really 50 yards away you would need a 
separation of at least 3 feet - and that would only give you moderate 
3D!!  (50 to 1 can still be a bit on the flat side)

>Using Karen's twin Xa2's ( I drilled an extra hole 
>in the bar for moderate hypers) I took the same 
>shot.

Nancy (my wife) has a twin XA rig and she carries a piece of 2 inch x 2 
inch x º inch aluminium angle iron in the car for hypers.  This bar is 
about 1 metre long and has a series of holes drilled in it.  If the 
closest object was greater than 50 yards away she would normally use two 
tripods.  We have extension wiring so the cameras stay in perfect sync.  
Personally I use a couple of SLRs in a similar configuration, however I 
must say the XAs give excellent results and are much easier to lug 
around.

>After viewing each image, I noticed that the realist 
>image flattens out much quicker beyond the trees and 
the buildings appear to be on the same plane ( flat)
>The XA2's image has noticeably more depth, the 
>buildings have distinguishable depth for 2 city 
>blocks before flat infinity. Unlike aerial 
>photography where large bases would have to be >exponentially larger to 
notice a difference, don't 
>you think moderate hypers >have applications 
>requiring more than 65mm but not 
>much greater than 120 mm or so??

>Mark Dottle

I think, Mark, that we are talking about degrees of "FLAT".  Both 
pictures would be FLAT with the separations that you are talking about - 
if the closest object was 50 yards away!!  

Are you sure there wasnít some road or paving in the foreground that 
gave you the depth that you saw.

Ray Moxom, Sydney Australia




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