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 Post subject: Star Trails
PostPosted: Wed Aug 24, 2011 12:32 am 
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Location: South Otago, NZ
Star Trails:
Image

Taken with a 10.5mm fisheye lens
f2.8
1538.6 second exposure (25 minutes and 38.8 seconds)
ISO 800

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 Post subject:
PostPosted: Fri Aug 26, 2011 5:18 pm 
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Location: Bristol, UK
WOW

Pretty much sums it up for me. What I really like is you can clearly make out the Milky way.

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 Post subject:
PostPosted: Sat Aug 27, 2011 9:44 pm 
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The fact that you can clearly make out the Milky Way is what makes this shot - amazing!

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 Post subject:
PostPosted: Sun Aug 28, 2011 8:18 am 
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Location: Queenstown, New Zealand
Very nice shot!


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 Post subject:
PostPosted: Mon Aug 29, 2011 8:26 pm 
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Location: Jorba, Barcelona, Spain
That's excellent. I heard that long exposures were the batteries quite a lot. (We were talking about 30 second espousers). Haw about 25 minutes? :shock: Do you take any special precautions dew to power with such pictures?


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PostPosted: Tue Aug 30, 2011 7:22 am 
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Very nice! Makes me want to go out at night with my fisheye again!

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 Post subject:
PostPosted: Tue Aug 30, 2011 7:22 pm 
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Location: South Otago, NZ
Thanks for the comments guys.

No i don't worry to much about the batteries when taking these shots other than to make sure that there is enough charge to complete the shot.

On a side note i have discovered that my camera will not take exposures longer than 30 minutes. It seems that once the time reaches 30 minutes the shutter automatically closes.

Here is another one taken a couple of nights ago:
Image

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 Post subject:
PostPosted: Wed Aug 31, 2011 4:43 pm 
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Location: Bristol, UK
To go longer than 30s you will need a remote release cable then you should be able to set Bulb mode and take exposures for as long as you want.

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 Post subject:
PostPosted: Wed Aug 31, 2011 4:55 pm 
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Location: UK
The limit was stated as 30 minutes not 30 seconds :)

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 Post subject:
PostPosted: Wed Aug 31, 2011 5:01 pm 
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Oh yeah, so it was....my bad, sorry.

That seems a bit weird having a 30min limit....

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 Post subject:
PostPosted: Wed Aug 31, 2011 9:35 pm 
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Great work Muzza! Where in South Otago are you? If you're ever in QT, drop me a line!


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 Post subject:
PostPosted: Thu Sep 01, 2011 2:04 am 
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Location: South Otago, NZ
I sure will Gordon. I live just out of Clinton. The orange glow seen at the bottom of these photos is most likley light polution form Gore which is 40km away.

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 Post subject: Star Trails
PostPosted: Fri Sep 02, 2011 1:59 pm 
Really nice shots.

I have tried a few star/night shots on the bulb setting. And I haven't really timed them. But when I take a long exposure with my Canon 450 with the wide angle lens how ever long the exposure is the camera takes about the same amount of time for to process the image.

It's the waiting that's hard to see what I got. I do make sure that the battery has enough charge. Don't know what would happen if the battery dead while the camera was still processing the image.


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 Post subject:
PostPosted: Fri Sep 02, 2011 7:45 pm 
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Location: South Otago, NZ
Hi kistorey

I can't speek for canons, but what you are talking about in a nikon is called; 'high iso noise reduction'. This is an option that can be enabled. I believe that after shutter closes the camera then turns the sensor back on while the shutter remains closed, to record just the noise that the sensor is picking up. This second noise image is then subtracted from the initial image to reduce the noise. This is why the processing takes so long because the noise recording is the same legnth of time as the actual image.

This is my understanding of this, so feel free to correct me if I have got this wrong.

Earlier in the thred I stated the tha longest image I could take was 30 minutes. With further testing I have discovered that when using a wired cable release the shutter can be kept open longer. So it seems that it is just when using the wireless remote the limit is 30 minutes.

George.

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 Post subject:
PostPosted: Sat Sep 03, 2011 11:13 pm 
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Location: Toronto, Canada
The second shot is even better! Looks like the 2 fuzzy patches in the top left are probably the Large and Small Magellanic Clouds, which is awesome!

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