A Closer Look: How I Created a 248MP Photo of the Sun

https://petapixel.com/2021/09/15/a-closer-look-how-i-created-a-248mp-photo-of-the-sun/

by giuliomagnifico • 5 years ago

131 21 5 years ago

petapixel.com

mirekrusin2• 5 years ago

Impossible to read with those ads on mobile, scrolling auto clicks ads etc.

hunter-gatherer• 5 years ago

Have you tried Ublock origin?

mirekrusin2• 5 years ago

Can you install it for Safari on iOS?

ben_w3• 5 years ago

Why is the limb brighter than the center in some images of the sun, and the other way around in other images? I’m guessing either wavelength dependancy or post-processing artistic choices, but I don’t know which and the article made me actually aware of my ignorance.

e.g. https://en.wikipedia.org/wiki/File:Sun_STEREO_4dec2006_lrg.j... vs. https://en.wikipedia.org/wiki/File:Sun_white.jpg

Kikawala• 5 years ago

https://en.wikipedia.org/wiki/Limb_darkening

ben_w3• 5 years ago

And the opposite effect, as shown in my first link?

Ronson• 5 years ago

Is there a link to the 248MP image?

roessland• 5 years ago

I would pay for a huge-res version I can print and hang in my living room.

TrainedMonkey• 5 years ago

See sibling comment, full version is available on Google Drive.

jlaporte• 5 years ago

The photographer's (Simon Tang's) full-size images are available here:

* https://drive.google.com/drive/folders/1M0EpmTs6iU97J05846UA...

And his Instagram:

* https://www.instagram.com/simon2940/

cirrus3• 5 years ago

Fascinating and terrifying.

eCa2• 5 years ago

The moon is also fun to photograph. The lockscreen of my phone is a photo of the moon I took with an entry level DSLR and 250mm lens. It’s reasonably sharp and detailed.

I didn’t realize before that just how quick the damn thing is.

belgesel• 5 years ago

Just out of curiosity, how much time you have before taking the shot? (seconds or minutes)

_ph_• 5 years ago

It of course depends on the focal length of the lens, but with a tele lens in the 200-400mm region (also depending on your sensor size), I would estimate that the moon crosses the image in the order of a minute. There is plenty of time to frame and focus the shot, but you have to readjust your camera every couple of shots. This motion is just the earth rotation and the same for the moon, the sun and all the stars. The rotation of the moon around the earth becomes noticeable only from day to day, as the moon roughly moves 13 degrees/day. Tracking mounts have a separate speed setting though, which does take the moons movement into account for greater precision.

gattr2• 5 years ago

Ignoring the (rather slow) orbital motion of the Moon, consider: the sky (and the Moon) appears to rotate 360°/24 h. This amounts to 360/(24*3600) = 0.004167 °/s. The apparent size of the lunar disc is about 0.5°, so it takes about 120 s for the Moon to move by its own diameter in the sky. Plenty of time.

eCa2• 5 years ago

Exposure time was 1/640 of a second[1]. Must say I’m surprised it was that fast, but you fight both blurriness from the motion and the quite intense light reflected by a full moon.

So first manually focus, then I aimed a bit ahead along its path and waited a few seconds. Remote trigger and tripod is necessary to avoid any camera movement.

[1] f/9, Iso 400, -3 step

A Closer Look: How I Created a 248MP Photo of the Sun

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