Re: [PanoToolsNG] Re: Panorama Resolution Limits
- :) ouch! 27 million pixels ... that's a panorama 72 kilometers wide and 36
km high.... MOAP (Mother Of All Panoramas), miniaturizing Mt. Everest,
which is "only" a little under 9 km's above sea level where highest.
Many thanks for the numbers, quite interesting to think about.
On Sun, May 30, 2010 at 3:23 AM, hd_de_2000 <der@...> wrote:
> If you're not concerend with DOF, then the only parameter determining
> resolution is the physical aperture size, ~2.4m for the Hubble telescope.
> This would be a panorama 27 million pixel wide, and the hyperfocal distance
> 10568km. From these results you can conclude that we have miserable wether
> right now preventing me from riding my bike.
> Helmut Dersch
[Non-text portions of this message have been removed]
>:) ouch! 27 million pixels ... that's a panorama 72 kilometers wideThere's no hard-wired link between pixel count and physical size. At
300ppi (approx 118 pixels/cm) you'd be looking at a panorama of only
1.42 miles or 2.28 km wide...
...heh. Did I really say "only"?
- hey groovy, that's the width of this pano - 192000 pixels :-)
it seems that any larger gigapixels out there have been refocused to shoot each row (which i did not do, shooting this)
--- In PanoToolsNG@yahoogroups.com, "hd_de_2000" <der@...> wrote:
> While browsing some online gigapixel panoramas, I wondered what physical resolution limits exist based on fundamental optical laws. Combining diffraction limit & depth-of-field formulas yields a universal minimum hyperfocal distance h for photographing 360 degree panoramas:
> h = width^2 * 1.39 * 10^-8 m
> Some numbers: w=10000 pixel: h=1.39m
> w=192000 pixel: h=512m
> This limit is independent of lens and sensor, but may not be reached with some lens/sensor combinations.
> For close-up panoramas a similar formula for the minimum object distance a and a desired depth-of-field da may be derived:
> a/h = da/a (da << a)
> Example: if the desired depth of field is +/- 10%, then with the same numbers as above, the minimum object distance is 0.139m fo the 10000 pixel wide panorama, and 51.2m for the 192000 pixel wide panorama.
> Helmut Dersch
> The exact formula is
> h = width^2 * lambda/(4*pi^2).
> Probably someone has calculated that before, but I did find no reference.