Celestia Crash Tutorial

Open source 3D astronomy program. Uses real photos on top of 3D models.
It has a huge database of stars (with distance, size and temperature data) and even galaxies!.
People of the world:dowload it


Tilt camera

Change zoom

Orbits and Labels (B Stars  P Planets M Moons E Galaxies)

Grid ;

Constellations /

Enter, type,  go to

1-8 planets, H Sol

Time speed +K,- L Reverse J

Follow F, Sync orbit Y and the other one

F10 screenshot

Increase/decrease luminosity [ ] { } ( )

Celestia ShortcutsSeguir leyendo

Hyperfocal distance graph – Distancia Hiperfocal

How close to focus and still have it all in focus.
Hyperfocal distance - Distancia hiperfocal 

Hyperfocal distance graph, originally uploaded by Mr.FoxTalbot.

1) If we focus too close the distant part of the image will not be in focus
2) If we focus too far away we are “wasting” some dept of field and giving up focus in the foregroud
3) By calculating the exact hyperfocal distance we make the most of the available depth of field.… Seguir leyendo