Borbin the 🐱

Sonnenfinsternis 2023 ☉🌛

14 Oktober 2023


14. Oktober, eine ringförmige Sonnenfinsternis ist morgens bei uns mit 80% Abdeckung zu sehen. Der Mond ist weiter von der Erde entfernt und verdeckt die Sonne nicht komplett. Es bleibt ein Ring oder Feuerkranz sichtbar.

Alle Bilder sind mit einem Neutraldichtefilter (7 Blendenstufen, ND128) aufgenommen (Nikon Z30, 18-140mm VR) und ausgeschnitten, aber nicht nachbearbeitet. Leider sind die ersten beiden Bilder noch mit ISO800.


1/4000s f/22 ISO800


Maximale Verdunklung der Sonne (80%).
1/4000s f/32 ISO800


ISO auf min Wert, bessere Belichtung für die aktuelle Helligkeit. ND-Filter müsste noch stärker sein.
1/4000s f/32 ISO100


ND-Filter zurück auf 3 Blendenstufen, aber der Sonnenkranz überstrahlt sofort das ganze Bild.
1/4000s f/32 ISO100


12 Minuten später, die maximale Verdunklung ist vorbei, ☉ und ☾ driften wieder auseinander.
1/4000s f/29 ISO100


24 Minuten später.
1/4000s f/20 ISO100


43 Minuten später, die ringförmige Sonnenfinsternis geht jetzt zu Ende.
1/4000s f/40 ISO100


Uneven Exposures

13 Oktober 2023


While at Kualoa Ranch taking a 360x180° panorama, I also made a 1x2 panorama at a picturesque point. But both pictures were taken with different exposures using the auto setting. The left side picture is 1/500s f/8 and the right side picture is 1/400s f/7.1


1/500s f/8 to 1/400s f/7.1 is 2/3 of a stop ( ln( (7.1/8)^2 * (400/500) ) / ln(2) ), resulting in uneven exposures. See this excellent exposure calculator.
See also Uneven Exposures and correction.


The exposure alignment of the panorama stitching might not always be successful and can result in an exposure seam as in this example:


To avoid this, the pictures need to have matching exposures. In this case, the left side picture is made 2/3 stops brighter than the right side:


The 1x2 panorama with no exposure seam, only the reflection of the mountains:


Hühnchen-Gemüse-Burger

01 Oktober 2023


Die Frikadelle wird aus frischem Hühnchen und Gemüse gemacht.


Tomatenscheiben als nächstes:


und Zwiebelscheiben:


Dann die Soße:


Fertig zusammengebaut:


Serviert mit Pommes Frites:


Panotools projections example

20 September 2023


The panotools projections are very versatile to achieve different mappings.

I wanted to take a photo of a tall object but could not step back for a normal view angle. In this case to capture the restaurant with its palm trees from the pathway.


Both full frame fisheye pictures for a good vertical and horizontal coverage to start with:


Each of the projection has a different mapping. The Transversal projections (rotated 90°) are not used here because of the horizontal distortion:


The full frame fisheye projection:


The Equirectangular projection:


The Vedutismo projection:


The Cylindric projection:


The Rectangular projection:


And the Mercator projection.
The restaurant with the largest 🌴 in Hawaii.


See also Panotools projection, The Balcony Panorama and Stereographic projection.


The Balcony Panorama

20 September 2023


With the limited view from a balcony, the result is a half spherical panorama with 180°x180°.
This is quite different from the Tower Panorama.

In the Balcony Panorama, the half sphere is to one side only:


In this example, 6 full frame fisheye pictures cover the 180°x180°:


The 360°x180° equirectangular panorama editor view displays only half the view as expected:


The cropped picture shows the equirectangular projection of the half sphere:


Different projection can be used to minimize the visible distortion.
The Transversal projections are ideal because of the large vertical field of view.

The Transversal Equirectangular projection:


or the edge-of-the-world projection:


The Transversal Cylindrical projection:


The Transversal Mercator projection:


The Transversal Vedutismo projection:


The Stereographic (circular fisheye) projection:


And the little Planet projection:



Compared to the Cylindrical projection:


And the normal rectangular projection.
That wide angle lens has to cover 150°. Good to have a 🐟👁:


See also Panotools projection, Panotools projections example and Stereographic projection.


Neuere Beiträge →← Vorherige Beiträge