All of the solar images are overexposed and larger than the sun's actual size.Mikado wrote:
Why is the Sun different sizes? Sep 30 being the smallest.
The smaller suns are probably partially obscured by haze/cloud and thus closer to actual size.
All of the solar images are overexposed and larger than the sun's actual size.Mikado wrote:
Why is the Sun different sizes? Sep 30 being the smallest.
The relatively small disc on September 30th in the picture looks like it's due to considerably less exposure, and therefore shows less distortion than most of the other solar images, which look enlarged due to flaring from overexposure. The position of the September 30th sun also looks a little out of place, as do a few of the other dates, so the analemma loop is a bit lumpy.Mikado wrote:Why is the Sun different sizes? Sep 30 being the smallest.
I find that to be a relatively ignorant suggestion.phoenix900 wrote:Suggest this and all similar posts be written not as the SUN MOVING, but the EARTH moving.
The asymmetry is because you cannot keep the camera at a steady location outside for the entire year (as you would usually do to shoot a year-long analemma). Since temperature goes down to -80 degrees Celsius, you can only retrieve the camera after each shot and take extra care to place it at exactly the same position next time. However, even the tiniest slip in this, coupled with the wind that is blowing at times when you shoot are responsible for the wobbling that you notice.HellCat wrote:So why does there seem to be some asymmetry here? Did the camera stand wobble because of global warming?
Indeed, 16:00 local time, that is UTC+8 for Concordia Station, without daylight saving (obviously)!Nitpicker wrote:Interesting. I guess that the "4 pm" is based on UT+8.
Exactly, September 30 was a particularly cloudy day and thus the solar disc appears smaller. For the rest of the exposures, they were all made with a limited-capability compact digital camera (as my primary DSLR was fried in the cold!), hence the overexposure that could not be corrected at the time of shooting.neufer wrote:All of the solar images are overexposed and larger than the sun's actual size.Mikado wrote:
Why is the Sun different sizes? Sep 30 being the smallest.
The smaller suns are probably partially obscured by haze/cloud and thus closer to actual size.
Maybe this can help! https://youtu.be/-p1OTqlx7hU .geckzilla wrote:I think it would be easier for most people to understand the image if they saw all the images (or at least a selection of them) that were combined to create the final composite.
Precisely! That's exactly the reason; the background picture was made at a different time of the day than the filtered the solar exposures and they were all put together at the end. The reason for shooting the background at a different time of day is, mainly, the solar reflection you would have in the photo which might also set the natural colors off a bit.BMAONE23 wrote:The shadows are in deed pointing to the left of the image indicating that the sun is off to the right at the time the image was taken. This is likely because the sun Was off to the right at the time the final background image was taken.dennisma wrote:These shadows look all wrong. It looks like the sun farther right and behind the camera not right in front.
The reason for this is that the 23 sun images that have been combined to form the analemma were taken when the Sun was pointing at the camera lens, Probably through a filter so as not to over bake the CCD. The 24th image was taken with the Sun out of the field of view and without the filter so that the background could be exposed without an overexposed sun within the field of view.
Sorry to disappoint you both, they are neither the aurora nor Mangellan's Clouds (both of which become invisible even in faint sunlight)! What you see here is some internal reflection of sunlight by the solar filter, on the camera CCD. Again, it wasn't the best camera to shoot with, but since my DSLR fell victim to the extreme conditions of Antarctica, it was the only choice!Indigo_Sunrise wrote:BMAONE23 wrote:What causes the Red Fire patches to the left of the Analemma?
It looks like LMC and SMC or Red Aurorae but ???
I thought they looked like sprites!
The YouTube vid you posted clearly shows the red areas as reflections on different daysGuest wrote:Sorry to disappoint you both, they are neither the aurora nor Mangellan's Clouds (both of which become invisible even in faint sunlight)! What you see here is some internal reflection of sunlight by the solar filter, on the camera CCD. Again, it wasn't the best camera to shoot with, but since my DSLR fell victim to the extreme conditions of Antarctica, it was the only choice!Indigo_Sunrise wrote:BMAONE23 wrote:What causes the Red Fire patches to the left of the Analemma?
It looks like LMC and SMC or Red Aurorae but ???
I thought they looked like sprites!