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About Deviant Official Beta Tester DavidMale/United Kingdom Groups :iconinfrared-club: Infrared-Club
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Scooby777

Journal
Update on Hiatus
As most of you know, I have been DA absent, but there was a reason. My life has been extremely chaotic since March, to include the passing of my dear Tuffy. I bought a house that took until April 28th to close and I just barely got myself into it this past weekend, which included a car accident that was totally my fault. I had packed my truck too full and couldn't see properly. No, I was not hurt. Anyway, I used the term "into" loosely. I am up to my eyeballs in all my stuff trying to get things put away and also cleaning up my old place. Since that house belongs to my family, thankfully I have been given plenty of time to move all my roses, irises, lilies and tulips. Roses and Irises are the easiest to move, being the most hearty. But, moving Lilies, that is another story completely. Not to mention, along with getting my house in order, I have to still prepare my very large backyard. The front is done, thankfully, but the back...well. Let's just say I have my work cut out for me. My n
:iconScooby777:Scooby777
:iconscooby777:Scooby777 2 31
Journal
RIP My Sweet Tuffy
I am so devastated by the loss of my sweet Tuffy this morning.  He had become ill and had been at the vet for 25 hours before it was found that he had Lymphoma.  He was only 7 years old and I was not prepared to lose him so soon.  Before they put him to sleep, I was able to spend time with him.  He was so happy to see me, purring immediately even though he was in pain.  He curled up against me as I cried...my heart is broken.
He brought so much joy to my life and to my home.  He will be missed so much, I can't even express it into words.
RIP my sweet, sweet boy.  I will see you again.



:iconScooby777:Scooby777
:iconscooby777:Scooby777 5 49

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Okavanga
David
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Scientist, scholar, philosopher, writer, photographer, traveller, sportsman, oenophile, whisky drinker, beer imbiber, cat lover, art historian, walker, driver, reader, computer geek, TV watcher, music listener, photo editor, Web contributor, enjoyer of good food, expert witness, industrial consultant, legal advisor, problem solver, analyst, chemist, information retrieval expert, sometime rider, runner, keep-fit addict, hypocrisy hater, politician loather, altogether - a devious deviant.

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Starry Night (or Day?)

Journal Entry: Wed Jun 14, 2017, 12:31 AM
When I look at some of the stunning astro-photography here on DA - check out MaxArceus, LinsenSchuss, ChrisAstro102  - I am hesitant about posting these three images. There is little aesthetic appeal in them, simply being a tyro's attempts at photographing the dark night sky at Rawnsley Station in the Flinder's Ranges in South Australia. The first shot is probably a standard sort of starscape image, long exposure, 30 seconds, using a tripod to hold a Canon 5D Mark III fitted with the TS E24 mm lens at f/3.5. Focus was achieved using LiveView and manual adjustment on a bright point star. Note also that the time shown in the EXIF data is UK time, and 11 hrs 30 minutes needs to be added to give the time in South Australia, i.e this was taken at about 9.51 pm or 21.51. I didn't quite get the great swirls of stars and moon that Vincent van Gogh achieved in his famous painting "Starry Night" en.wikipedia.org/wiki/The_Star…,  but I did manage some mountain pines that must stand for the cypress tree in his painting. The image shows the Milky Way quite clearly, and if you zoom in you can see the stars are not point sources of light, but small curved streaks. This is because the Earth is rotating and even a short exposure time (for an astro-photography shot) like 30 seconds causes the apparent position of the stars to move - hence the streaks. Notice also the light from the cabin in the bottom left of the shot. I thought at first that this would spoil the shot, but it acts as a handy reference for the main subject.


Starry Night 1 by Okavanga


The next two shots are to my mind somewhat more interesting. Let me sort the time first of all. The EXIF data shows about 7.30 pm, but that is UK time. The time at Rawnsley Station was thus about 7 am. Now at that time of the year, sunrise is after 8 am, so these shots were taken in "the dark" - no sunlight. But, immediately you feel something is wrong - look at those powerful shadows! Surely, the Sun is up. But, also see that there are still stars in the sky - what is going on? Well, the shadows are cast by moonlight, there being an almost full moon at the time, with light so bright that even human eyesight could distinguish detail as well as the moon shadows - all very romantic. But still, if you have ever been out and about in bright moonlight you might feel that there is still something not quite correct here. The stars are OK if it is still night; the shadows are OK if there is bright moonlight, but what is odd is that we are seeing this image in colour. Interestingly, the colour palette here is not a million miles from that in the van Gogh painting - he obviously used a digital camera (ahem)!

Starry Night 2 by Okavanga


Our eyes have two types of sensor, the so-call rods and cones. The rods are the main means by which we sense light and dark, basically being monochrome sensors, and are very sensitive; cones are not nearly as sensitive but they provide colour information. They need high levels of light before being able to function well. Thus, in even strong moonlight the rods are the source of effectively monochrome images. In sunlight, the cones come into play. Thus the image above by displaying colours is more like cone vision. Now take a look at the third image.

Starry Night 3 by Okavanga

Taken at more or less the same time and under the same exposure conditions, this image appears to be a full Sun image, and were it not for the stars, I bet we would all say this was a daytime shot. But, no, apart from light from the Moon, the view was very dark. What I have done is auto adjusted the exposure to give a full tonal range, and hence quite a nice "daylight" with stars shot.  The camera has red, green and blue sensors, but they do not react as our eyes do. Instead they will record full colour if it is there even if prevailing light conditions are low. The long exposure time is enough for sufficient colour information to be gather and subsequently displayed. And hence a "night-to-day" shot.

 The palette in the van Gogh painting is kind of between what would be expected for a night scene and that for a day scene. van Gogh simply saw it in his own way. Just like the song.






David aka Okavanga :iconokavanga:

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Okavanga has started a donation pool!
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I have opened this donation pool for contributions to maintain the Super Group status of the Infrared-Club (Extra-Visible Imaging). Any amount of points would be much appreciated. In return you will receive a mention on the Group's Home Page, on this page, and faves of your work to be displayed on this page. Extra large donations will receive a feature on the Group's Home Page.

Many Thanks

David

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Comments


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:iconthewolfcreek:
thewolfcreek Featured By Owner 2 hours ago  Hobbyist Photographer
Thank you for the fav David...
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:iconokavanga:
Okavanga Featured By Owner 2 hours ago
:iconthumbupplz:
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:icondamainnero:
DamaInNero Featured By Owner 2 days ago
Thank you so much for the faving!
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:iconokavanga:
Okavanga Featured By Owner 2 days ago
My pleasure.

David
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JocelyneR Featured By Owner 3 days ago
Thank you kindly for the faves, David!  :iconflyingheartsplz:
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:iconokavanga:
Okavanga Featured By Owner 2 days ago
My pleasure. 

And, Jocelyn, thank you so much for the donation to my "pool". That was very kind of you. 

Thank you so much!(Animated) by Lacerem

David :hug: :heart:
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:iconfotoponono:
fotoponono Featured By Owner 3 days ago
Nod on collection of 'cool pose' 
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:iconokavanga:
Okavanga Featured By Owner 3 days ago
No probs!
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:iconfotoponono:
fotoponono Featured By Owner 2 days ago
Hi! 
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MaresaSinclair Featured By Owner 3 days ago
Thank you for the favourite. Much appreciated.
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