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AstroPhotoraphy Anonymous
I just got a 30D and I've been taking some shots of the sky. Can /P give some tips on taking some cool star shots? This picture of orion I made by taking 5, 10sec exposures and putting them together in Photoshop.
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Camera-Specific Properties:Equipment MakeCanonCamera ModelCanon EOS 30DCamera SoftwareAdobe Photoshop CS2 WindowsPhotographerunknownMaximum Lens Aperturef/5.6Image-Specific Properties:Image OrientationTop, Left-HandHorizontal Resolution240 dpiVertical Resolution240 dpiImage Created2007:01:07 14:43:16Exposure Time5 secF-Numberf/14.0Exposure ProgramShutter PriorityISO Speed Rating3200Lens Aperturef/14.0Exposure Bias0 EVMetering ModePatternFlashNo Flash, CompulsoryFocal Length55.00 mmColor Space InformationUncalibratedImage Width3504Image Height2336RenderingNormalExposure ModeAutoWhite BalanceAutoScene Capture TypeStandard
>> Anonymous
I think the key is to take very long exposures like>>33762mentioned [half hour long exposures and the like]. Also, it wouldn't help to visit an island or a place where pollution is more minimal, when I visited Hawaii the night sky was so clear it was ridicilous.
>> Photon
Here's my thread on long exposure. No one commented...

http://zip.4chan.org/p/res/33612.html
>> Anonymous
equitorial mount = a must
>> Anonymous
Use film if you are going to be doing long exposures. About 100 ISO or lower should be good. Digitally you cant do the same, since the pixels in CCD sensor overload and turn weird colors, therefore you have some of those awkward flashes that are sorrounding some stars in your pic. That and the noise levels will be quite high. For long exposures of 5-10 seconds, DSLR is allright, but not for skies. I'm talking roads and buildings.
>> Anonymous
Thanks a lot /p. The wierdness you see in the stars is because of postprocessing in photoshop. I adjusted the contrast to drown out some of the noise from the sensor but it overexposed the stars center.
>> Anonymous
If you do still want to be digital, a better option would be to use a tele lense and make a composite of 5+ shots of the stars up close. Since its just black space sorrounding, it wont be a problem to blend
>> Anonymous
>>33772

And if your camera uses CMOS as opposed to CCD, will there be the same effect?
>> eku
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>>33772

If I'm not mistaken, 30D should be cabable of taking night sky photos. First it captures the actual image, and then takes another with same exposure time, but uses the second one to remove the noise and other shit from the first image?

But, shouldn't this be possible in Photoshop too, if camera doesn't have this function? First taking the real picture, then another with the lens cap on, and doing magic in PS?

Picture somewhat related.

Camera-Specific Properties:Camera SoftwareAdobe Photoshop CS WindowsImage-Specific Properties:Image OrientationTop, Left-HandHorizontal Resolution96 dpiVertical Resolution96 dpiImage Created2006:08:08 23:18:38Color Space InformationUncalibratedImage Width900Image Height600