Shooting the Solar Eclipse

 

If you are using live view and or doing a long exposure then your sensor and eyes is at risk. This danger exists no matter how many filters you put on. Short snaps of the sun will might not harm your equipment, but filters is still advisable. One option is to use inexpensive welding glass over the lens instead of high-priced filters.

The rectangular filters in welder’s helmets that protect their eyes from the intense light of welding sold in different degrees of “darkness,” to suit different jobs. Welder’s glasses is assigned DIN#, which can be calculated from


T is transmission, the fraction of visible light transmitted

Resolving for T leads to the quick conclusion that from DIN10 and up we should be fine J (but no guarantees from my side)

 

Words on safety, a MUST READ!

 

Din numbers VS f/Stop reductions

Amateur astronomers typically use a DIN#14 welding glass to view the sun with the naked eye. When a solar eclipse is imminent, that shade sells out.

Use two rubber bands to mount this glass in front of your lens.

 


 

 

Stacking two polarizing filters for a variable ND

Stacking two polarized filters as a variable neutral density filter, but they are not good for solar eclipse photography for a number of reasons.

  1. The effect is depended on the ever-changing angle towards to sun. Polarized filters show most strong effect when pointed 90degrees from the Sun.
  2. The overall density is variable the polarizing effects might not be desired. Adding to this is differences in linear and circular types.
  3. Visible light is not the part of the spectrum that burns the eye. Polarizers do not block ultraviolet light and exposing your eye to the raw output of the sun will damages your eyes.

     

Regions seeing at least a partial eclipse


 

There is 5 phases in a solar eclipse

  1. Partial eclipse begins (first contact): The Moon’s shadow starts becoming visible over the Sun’s disc. The sun looks as if a wolf has taken a bite from it.
  2. Full eclipse begins (second contact): the Moon covers almost the entire disc of the Sun. Observers in the path of the Moon’s umbra may be able to see Baily’s beads and the diamond ring effect.
  3. Maximum eclipse or totality: The Moon completely covers the disc of the Sun. Only the Sun’s corona is visible. This is the most dramatic stage of a Total Solar Eclipse. At this time, the Sky goes dark, temperatures fall drastically and birds and animals often go quiet.
  4. Full eclipse ends (third contact): The Moon’s shadow starts moving away and the Sun reappears.
  5. Partial eclipse ends (fourth contact): The Moon stops overlapping the Sun’s disc. The eclipse ends at this stage.

Special Sights

During the total solar eclipse, see these phenomena’s

  1. Baily’s beads: Seen about 10-15 seconds before and after totality, Baily’s beads are little bead-like blobs of light at the edge of the Moon. These happen because the gaps in the mountains and valleys on the Moon’s surface allow sunlight to pass through in some places but not others.

    Diamond ring: As the Moon moves to cover the entire disc of the Sun; Baily’s beads disappear, leaving one last bead a few seconds before totality. At this point in the eclipse, the Sun’s corona forms a ring around the Moon. The ring around the Moon and the leftover Baily’s bead gives the appearance of a diamond ring.

  2. The Sun’s chromosphere: The Sun’s atmosphere has three layers: the photosphere, the chromosphere and the corona. See the chromosphere the first few seconds’ right after the diamond ring disappears during a total eclipse of the Sun. It will appear as giving out a reddish glow.
  3. The Sun’s corona: Like the chromosphere, the Sun’s corona is only visible during a Total Solar Eclipse. It looks like a faint ring of rays surrounding the dark Moon during totality.
  4. Shadow bands: About one minute before and after totality, see the moving wavy lines of alternating light and dark on plain-colored surfaces. These shadow bands are the result of the light emitted from a thin solar crescent being refracted by the Earth’s atmosphere.

More info

#eclipse #glasses #din

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