Quote:
Originally Posted by Danack
Hi guys,
Sorry for asking the same question again, but as I really like being able to see, I'd like to know how if it's possible to view the corona safely e.g.
http://www.telegraph.co.uk/science/s...on-camera.html
From the web page at:
http://xjubier.free.fr/en/site_pages...eExposure.html
The suggested exposure for to capture the corona at f8, ISO100 is between 1/400s for the inner corona and 1" for the outer corona.
That level of brightness wouldn't be visible through eclipse glasses or through solar filter. I'm also not sure the corona would even be bright enough to show up through most projection methods would it?
So is there an approved way of viewing the corona? |
By way of explanation you should follow the basic guidelines of wearing eclipse glasses and using filters during the partial phases. That is, when the sun is partially obscurred by the moon even up to the last 10-20 seconds you must use filters. Around 2-5 seconds prior to totality there will be a diamond ring view of bright light and the corona will be apparent to the naked eye. You should not look for the diamond ring if you have never seen one before as you might look too soon. Care should be taken until totality occurs (that means wear filters for eye protection). At totality you can view the corona directly via telescopic views or naked eye without filtration. It is safe then and only then. You will know when totality occurs as it is like someone turning off the light at night. You will not see anything if you maintain filters during totality and projection will not work. The view is quite hypnotic and you need to keep an eye on the time if looking through a telescope. The light of the corona is about 100,000 times dimmer than unfiltered sun light and the damaging energy is not present. At the end of the eclipse there will be another diamond ring and you can view this briefly again but care should be taken to prevent retina damage.
Those images of the corona are not what you will see. If it is clear you will see a fluffy donut in the sky and with any luck some prominences will be visible naked eye. Those images are highly processed.
Hope that helps. Please take all care and be safe during the partial phases.