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#11
Nov 30 2010 05:25pm
Quote (AlPi @ Nov 30 2010 12:50pm)
Well I guess I can't avoid the light pollution, my only chance would be to find a very dark place.
There are town's lights behind that house and I can't turn them off :p
And it was ok to have a dark house too, I just wanted to enhance the stars.
I need to find a good balance for ISO, f/ and exposure time somehow.


For that scene, I would go f/9 or so, ISO 100, and see what your exposure time is. My guess is that your stars will blur due to movement. The house/ground however is not going to move, so I would take a long exposure to get decent exposure on the house. Then you can do a faster exposure to get one for the stars so they won't be blurry, and merge the two.

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#12
Nov 30 2010 05:32pm
That same shot at f/9 ISO 100 will require an exposure time of 600seconds.. so 10 mins.. All he'll get is star trails.

He can use a bigger aperture and just shoot with hyperfocal distance.
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#13
Nov 30 2010 05:53pm
Quote (Eek @ Nov 30 2010 06:32pm)
That same shot at f/9 ISO 100 will require an exposure time of 600seconds.. so 10 mins.. All he'll get is star trails.

He can use a bigger aperture and just shoot with hyperfocal distance.


That's why I suggested two exposures. There's no way to get good exposures on both without star trails.
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#14
Dec 1 2010 12:55pm
Well didn't get to do it last night since it was pouring for the entire day.. pretty rare for Atlanta.. The skys are cleared now, hopefully tonight will be the same.
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#15
Dec 1 2010 10:35pm
I took this tonight, a shorter exposure time definitely helps alot. I used live view and zoom into 10x.. i found that zooming to infinity doesn't work and it's very blurry.. This is slightly away from infinity.

Below is EXIF data. I actually overexposed the shot by 2 stops.. I had to pull it back in Lightroom,

so f/1.4
2 seconds
ISO800

Or alternatively f/1.4, 1/2seconds, ISO3200.

I didn't have anything wider then 50mm so that was all i can do.

Hope it helped.

Code
Camera Maker: Canon
Camera Model: Canon EOS 5D Mark II
Lens: 50mm
Image Date: 2010-12-01 21:00:21 -0500
Focal Length: 50.0mm
Focus Distance: 2147483647.00m
Aperture: f/1.4
Exposure Time: 2.000 s
ISO equiv: 3200
Exposure Bias: none
Metering Mode: Matrix
Exposure: Manual
Exposure Mode: Manual
White Balance: Auto
Flash Fired: No (Manual)
Photographer: John Wai-Han Kwok
Copyright: John Wai-Han Kwok





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#16
Dec 1 2010 10:49pm
Quote (Eek @ Dec 1 2010 09:35pm)
I took this tonight, a shorter exposure time definitely helps alot. I used live view and zoom into 10x.. i found that zooming to infinity doesn't work and it's very blurry.. This is slightly away from infinity.

Below is EXIF data. I actually overexposed the shot by 2 stops.. I had to pull it back in Lightroom,

so f/1.4
2 seconds
ISO800

Or alternatively f/1.4, 1/2seconds, ISO3200.

I didn't have anything wider then 50mm so that was all i can do.

Hope it helped.

CodeCamera Maker: Canon
Camera Model: Canon EOS 5D Mark II
Lens: 50mm
Image Date: 2010-12-01 21:00:21 -0500
Focal Length: 50.0mm
Focus Distance: 2147483647.00m
Aperture: f/1.4
Exposure Time: 2.000 s
ISO equiv: 3200
Exposure Bias: none
Metering Mode: Matrix
Exposure: Manual
Exposure Mode: Manual
White Balance: Auto
Flash Fired: No (Manual)
Photographer: John Wai-Han Kwok
Copyright: John Wai-Han Kwok

http://i105.photobucket.com/albums/m223/Jdmhoodz/_MG_0037.jpg


Shoot Andromeda. It's my next project with the 5d II. Found a way to attach to a telescope, thx to Astronomy department in my university :D

This post was edited by onepagememory on Dec 1 2010 10:50pm
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#17
Dec 2 2010 02:07am
Woooow Eek, that's close to 100% what I wanted!

OFC your 5DmkII has like half the noise compared to my camera, but I think I can use ISO 400 and go for 4s or so.

And I will have to test zooming a while, since you said that zooming to infinite doesn't work.

Thanks a lot!

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#18
Dec 2 2010 07:24pm
Quote (AlPi @ Dec 2 2010 04:07am)
Woooow Eek, that's close to 100% what I wanted!

OFC your 5DmkII has like half the noise compared to my camera, but I think I can use ISO 400 and go for 4s or so.

And I will have to test zooming a while, since you said that zooming to infinite doesn't work.

Thanks a lot!


I think 4 seconds is a little too long. It may sound crazy, when i took a few shots before i nailed that one. On of the shots i took had a 5 second exposure and when viewing at 100% on my screen.. i notice a small trail :O

I don't think ISO1600 would hurt on your camera since you'll most likely have to pull it back in post (and that helps with noise too).

I left long exposure noise reduction on auto.. not sure how much it helped but meh

Also i notice i said zoomed to infinity.. it should be set focus to infinity. lol.
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