Some Solar eclipse results. Did you properly use a ND Solar filter for the partialities and remove for the totality?
Apr 13, 2024 19:30:51 #
druthven wrote:
Because we received only partiality here in Houston and due to the varying cloud cover I went from no filter to a variable density filter to a 16 stop solar filter. It was like a three ring circus. A far cry from my detailed plan to capture the Diamond Ring had we been able to travel to central Texas for totality as previously planned. The ring was the only thing I missed with the 2017 eclipse. Maybe We can catch it in northern Spain in 2026.
Apr 13, 2024 19:32:06 #
Apr 16, 2024 07:27:45 #
dhroberts
Loc: Boston, MA, USA
Beautiful work!
Some solar prominences are the consequences of active regions on Sun's surface. These are often associated with sunspots, places where the magnetic field is enhanced and the temperature cooler than the surrounding surface. This is also the location of some solar flares, where magnetic energy turns into thermal energy through a process known as magnetic field reconnection.
Occasionally prominences develop into coronal mass ejections, eruption of Sun's surface that throw plasma out into the solar system. In some cases these are oriented such that the CME reaches Earth, where the clouds of ionized gas and magnetic field can disrupt modern technology such as satellite communications
Other kinds of prominences erupt from quiescent parts of the solar surface.
There is a nice exposition of the physics and discovery history of prominences in Wikipedia.
Some solar prominences are the consequences of active regions on Sun's surface. These are often associated with sunspots, places where the magnetic field is enhanced and the temperature cooler than the surrounding surface. This is also the location of some solar flares, where magnetic energy turns into thermal energy through a process known as magnetic field reconnection.
Occasionally prominences develop into coronal mass ejections, eruption of Sun's surface that throw plasma out into the solar system. In some cases these are oriented such that the CME reaches Earth, where the clouds of ionized gas and magnetic field can disrupt modern technology such as satellite communications
Other kinds of prominences erupt from quiescent parts of the solar surface.
There is a nice exposition of the physics and discovery history of prominences in Wikipedia.
Apr 16, 2024 14:06:22 #
dhroberts wrote:
Beautiful work! br br Some solar prominences are ... (show quote)
Thank so much.
Thanks for the detailed info on solar prominences.
Cheers and best to you.
Apr 16, 2024 14:22:50 #
Apr 16, 2024 21:50:18 #
rlovaglio
Loc: Augusta, Maine
I got some good shots but your images are outstanding. Very nice and thanks for raising the bar.
Apr 16, 2024 21:56:37 #
rlovaglio wrote:
I got some good shots but your images are outstanding. Very nice and thanks for raising the bar.
Thanks so much. You are welcome, Cheers
Apr 16, 2024 21:57:04 #
Apr 17, 2024 10:19:12 #
rlovaglio
Loc: Augusta, Maine
You gave your f-stop and ISO for the totality images. Would you share your shutter speeds for those images please. Lately, I’ve been looking at exposures through the perspective of EV or exposure values.
Apr 17, 2024 15:43:19 #
Apr 18, 2024 18:29:53 #
Apr 18, 2024 18:39:39 #
rlovaglio wrote:
You gave your f-stop and ISO for the totality images. Would you share your shutter speeds for those images please. Lately, I’ve been looking at exposures through the perspective of EV or exposure values.
I had the camera set to do nine quick shutter-speed-bracketed shots in a row, bracketed by EV +/- .03 EV , so a 3-stop spread of exposures each time. Each time I took a shot, the camera made nine shutter-speed-bracketed shots.
The haze and cloud cover, and the amount of partiality, did effect the proper exposure. I kept the same f-stop f8, and ISO 100 throughout, to get the best sharpness and low noise.
Photo 1) 1/80 sec.
Photo 2) 1/125 sec.
Photo 3) 1/250 sec.
Photo 4) 1/10 sec.
Cheers and best to you.
Apr 18, 2024 23:02:17 #
rlovaglio
Loc: Augusta, Maine
Thank you, that was helpful. Your exposures were better than mine; I was open about two more stops. I prefer your Exposure values.
Apr 18, 2024 23:26:57 #
rlovaglio wrote:
Thank you, that was helpful. Your exposures were better than mine; I was open about two more stops. I prefer your Exposure values.
You are welcome.
I had a selection of three stops of exposure within nine bracketed shots, for each time I shot. Then I could pick the best exposure in post. That really saved me from worrying. I used aperture-priority.
And our local atmospheric sky conditions of clouds, haze, whatever, were different at our different locations, and changing all the time, so no two exposures would be exactly the same from different locations.
Cheers and best to you.
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