Astrophotography--Holy fuck, that's above us...

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Astrophotography--Holy fuck, that's above us...

Postby DrRinjswand » Sun Oct 01, 2017 11:31 am

Greetings and welcome one and all...

I am an avid amateur astrophotographer... Are there any others amongst us...

This is one of my favourites, M42 in Orion...

M42 in Oriona.jpg
M42 in Oriona.jpg (354.62 KiB) Viewed 1656 times
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Re: Astrophotography--Holy fuck, that's above us...

Postby DoglovingJim » Wed Oct 11, 2017 1:48 pm

DrRinjswand wrote:Greetings and welcome one and all...

I am an avid amateur astrophotographer... Are there any others amongst us...

This is one of my favourites, M42 in Orion...

M42 in Oriona.jpg

That's amazing, so you took that picture yourself? What type of camera do you use for that?
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Re: Astrophotography--Holy fuck, that's above us...

Postby Tesseracts » Wed Oct 11, 2017 2:21 pm

C1D6AC8E-B767-425B-95DE-42B17D3655B6.jpeg
C1D6AC8E-B767-425B-95DE-42B17D3655B6.jpeg (215.93 KiB) Viewed 1597 times


I’ve always wanted to do Astro photography, but I don’t have any equipment. Here is a photo I got of the eclipse.
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Re: Astrophotography--Holy fuck, that's above us...

Postby DrRinjswand » Thu Oct 12, 2017 1:02 pm

Hi DogLovingJim, Tesseracts. Thanks...

Tessercts, that is awesome, I'm well jealous that you got the eclipse, and that is a great photo!!

DogLovingJim, that is the result of processing a 'stack' of photos (a series of pics overlaid to enhance along with set blank pics to remove noise) taken with a Nikon D3100 with a 70-300mm lens at 300mm, processed in the DeepSkyStacker program.
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Re: Astrophotography--Holy fuck, that's above us...

Postby DoglovingJim » Fri Oct 13, 2017 1:09 am

DrRinjswand wrote:Hi DogLovingJim, Tesseracts. Thanks...

Tessercts, that is awesome, I'm well jealous that you got the eclipse, and that is a great photo!!

DogLovingJim, that is the result of processing a 'stack' of photos (a series of pics overlaid to enhance along with set blank pics to remove noise) taken with a Nikon D3100 with a 70-300mm lens at 300mm, processed in the DeepSkyStacker program.


Ah nice, so like you put multiple pictures on top of each-other with each like a different emphasis on colour right so together it looks all vibrant with colour? When it comes with pictures, what do you mean by "noise"?
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Edgar Cabrera wrote:HOLY SHIT GUYS, IT'S DOGLOVINGJIM!!! HE'S HERE!!!

skoobadive wrote:It's the legendary DoglovingJim! Ohboy, this must be the greatest day of my life!

Cracked.com wrote:Initially, his interest in animals was "primarily a sexual attraction," but as he grew older, he also "developed the emotional attraction." We guess we could call what Jim does ... dog-lovin'
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Re: Astrophotography--Holy fuck, that's above us...

Postby DrRinjswand » Fri Oct 13, 2017 5:02 pm

DoglovingJim wrote:
Ah nice, so like you put multiple pictures on top of each-other with each like a different emphasis on colour right so together it looks all vibrant with colour? When it comes with pictures, what do you mean by "noise"?


Not exactly DogLovingJim, you try to take a bunch as similar as possible so as when they are processed they bring out the weaker stars that might not show up well on individual shots. Some people do make multiple stacks taken through different coloured filters, then process them through Photoshop, but that's above my 'paygrade' at the moment.

'Noise' is basically regular glitches that affect the camera's sensor over longer shots. So you take a bunch of shots
with the same exposure as the 'coloured' shots, with the lens cap on so the sensor is shielded from any light. Then you get these stacked too and subtract them from the stack of 'coloureds' to eliminate false-positive sensor firings.

I hope this helps.
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Re: Astrophotography--Holy fuck, that's above us...

Postby DoglovingJim » Sat Oct 14, 2017 11:59 am

DrRinjswand wrote:
DoglovingJim wrote:
Ah nice, so like you put multiple pictures on top of each-other with each like a different emphasis on colour right so together it looks all vibrant with colour? When it comes with pictures, what do you mean by "noise"?


Not exactly DogLovingJim, you try to take a bunch as similar as possible so as when they are processed they bring out the weaker stars that might not show up well on individual shots. Some people do make multiple stacks taken through different coloured filters, then process them through Photoshop, but that's above my 'paygrade' at the moment.

'Noise' is basically regular glitches that affect the camera's sensor over longer shots. So you take a bunch of shots
with the same exposure as the 'coloured' shots, with the lens cap on so the sensor is shielded from any light. Then you get these stacked too and subtract them from the stack of 'coloureds' to eliminate false-positive sensor firings.

I hope this helps.


Well I'm certainly learning more with each question I make. So basically what you're saying with the first part is that you try to take multiple pictures of the exact same location and style (lets say for example 50 pictures) and sort of combine them, so that if one star was only visible on photo #34 and otherwise not bright enough than in the stacked photo it'd be on it?

And thanks, I appreciate it.
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Edgar Cabrera wrote:HOLY SHIT GUYS, IT'S DOGLOVINGJIM!!! HE'S HERE!!!

skoobadive wrote:It's the legendary DoglovingJim! Ohboy, this must be the greatest day of my life!

Cracked.com wrote:Initially, his interest in animals was "primarily a sexual attraction," but as he grew older, he also "developed the emotional attraction." We guess we could call what Jim does ... dog-lovin'
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Re: Astrophotography--Holy fuck, that's above us...

Postby Marcuse » Sat Oct 14, 2017 2:26 pm

DoglovingJim wrote:
DrRinjswand wrote:
DoglovingJim wrote:
Ah nice, so like you put multiple pictures on top of each-other with each like a different emphasis on colour right so together it looks all vibrant with colour? When it comes with pictures, what do you mean by "noise"?


Not exactly DogLovingJim, you try to take a bunch as similar as possible so as when they are processed they bring out the weaker stars that might not show up well on individual shots. Some people do make multiple stacks taken through different coloured filters, then process them through Photoshop, but that's above my 'paygrade' at the moment.

'Noise' is basically regular glitches that affect the camera's sensor over longer shots. So you take a bunch of shots
with the same exposure as the 'coloured' shots, with the lens cap on so the sensor is shielded from any light. Then you get these stacked too and subtract them from the stack of 'coloureds' to eliminate false-positive sensor firings.

I hope this helps.


Well I'm certainly learning more with each question I make. So basically what you're saying with the first part is that you try to take multiple pictures of the exact same location and style (lets say for example 50 pictures) and sort of combine them, so that if one star was only visible on photo #34 and otherwise not bright enough than in the stacked photo it'd be on it?

And thanks, I appreciate it.


Gonna second DLJ on that one. Cool to know.
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Re: Astrophotography--Holy fuck, that's above us...

Postby A Combustible Lemon » Sat Oct 14, 2017 4:15 pm

Noise is basically the grain you see in film. It's a signal processing term meaning "thing that isn't the signal" which (the signal) in terms of images is... the actual image.

The idea is that every picture is picture+noise. So 50 pictures is going to be 50*picture (since the picture is constant) + noise0 + noise1 + noise2 + noise3 + noise4 + noise5 + noise6 + noise7 + noise8 + noise9 ..... divided by 50.

Since noise is random every time (and the image+noise can be DIMMER than the original image, meaning the noise is negative), 50 noises don't add up into some super noise but cancel each other out and become a single noise instead. Which divided by 50 is a fiftieth of a noise.

I'll get some cool octave graphs later but I'm not on linux right now.
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Re: Astrophotography--Holy fuck, that's above us...

Postby DrRinjswand » Sat Oct 14, 2017 4:26 pm

A Combustible Lemon- Thanks you put it a lot better than I did!
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Re: Astrophotography--Holy fuck, that's above us...

Postby A Combustible Lemon » Sat Oct 14, 2017 5:15 pm

in construction: also can't remove dice.
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Last edited by Marcuse on Sun Oct 15, 2017 12:58 am, edited 1 time in total.
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Re: Astrophotography--Holy fuck, that's above us...

Postby A Combustible Lemon » Sat Oct 14, 2017 11:25 pm

double posting because the other one's infected with dice I can't get rid of.
I made a bunch of slides to show how the average of multiple noisy pictures ends up becoming closer and closer to the original as the number of noisy pictures goes up.

The first picture is Rincewind's original, the second is an example of the noisy picture you start with and the third is the result of the sum of all the noisy pictures in each series. As the number of noises increases, you can see that the actual value of noise in the third picture decreases continously. You'll notice at a 1000 it's basically just the original again.

2 images:
Image


5 images:
Image


10 images:
Image


50 images:
Image


100 images:
Image


1000 images:
Image
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WE ARE ALL FLOATING IN THE WINDS OF TIME. BUT YOUR CANDLE WILL FLICKER FOR SOME TIME BEFORE IT GOES OUT -- A LITTLE REWARD FOR A LIFE WELL LIVED. FOR I CAN SEE THE BALANCE AND YOU HAVE LEFT THE WORLD MUCH BETTER THAN YOU FOUND IT, AND IF YOU ASK ME, said Death, NOBODY COULD DO ANY BETTER THAN THAT...
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Re: Astrophotography--Holy fuck, that's above us...

Postby DrRinjswand » Fri Oct 20, 2017 10:53 am

Here are a couple more of my favourites for you guys...

Milky Way 1(b).jpg
Milky Way 1(b).jpg (591.03 KiB) Viewed 1345 times


This is the Milky Way, between Cassiopeia and Cygnus.

And...

Lovejoy1.1(b).jpg
Lovejoy1.1(b).jpg (173.28 KiB) Viewed 1345 times


The green dot just at middle centre is Comet Lovejoy.

Enjoy friends...
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Re: Astrophotography--Holy fuck, that's above us...

Postby DoglovingJim » Wed Jan 31, 2018 3:09 pm

I took several snapshots of the moon today (super blue blood moon) and you were the first bloke I thought of [well, technically the 4th person but you were the first who I didn't know in real life]. Anyway when I sort out which ones I like most I'll post them here soon.

(Did anyone else take pictures of the event?)
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Re: Astrophotography--Holy fuck, that's above us...

Postby DoglovingJim » Thu Feb 01, 2018 1:35 pm

Figured out how Imgur works (wow I'm growing up) and now I can post some of them.

https://imgur.com/gallery/ZCqcj

Image
Image
Image
Image
Image
Image
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Edgar Cabrera wrote:HOLY SHIT GUYS, IT'S DOGLOVINGJIM!!! HE'S HERE!!!

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