You thought Hubble was good... |
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MartinW
Moderator in Command Joined: 31 Mar 2008 Location: United Kingdom Points: 26722 |
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Posted: 02 May 2009 at 10:53am |
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...well the James Webb is going to be a cracker!
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FSaddict
Chief Pilot Joined: 02 Apr 2008 Points: 1067 |
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Hubble would have been better if it's mirror hadn't been out by a few nanometers (it couldn't focus properly and images appeared fuzzy) but clearly this will be better anyway.
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VulcanB2
Chief Pilot Joined: 02 Apr 2008 Points: 13365 |
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I'll wait until it is in orbit and the first images are in.
Best regards, Vulcan. |
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MartinW
Moderator in Command Joined: 31 Mar 2008 Location: United Kingdom Points: 26722 |
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No, the defect in the Hubble mirror was corrected by a shuttle mission. They fitted corrective optics, specs if you like. Do't think there's any evidence that it was in some way a lesser telescope after the fix. On the contrary, the images returned have been exemplary.
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FSaddict
Chief Pilot Joined: 02 Apr 2008 Points: 1067 |
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Oops didn't know that |
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VulcanB2
Chief Pilot Joined: 02 Apr 2008 Points: 13365 |
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They're on the fence over this. They were saying that correction is not as good as the optics being correct in the first place, but it is close enough. Best regards, Vulcan. |
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MartinW
Moderator in Command Joined: 31 Mar 2008 Location: United Kingdom Points: 26722 |
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I think with the fix or any fix, it can never be 100% as good as a perfect mirror in the first instance. I would imagine there has to be some losses as a result of the extra lens elements. But as you say, hardly enough to make a difference. When you see the images the Hubble has provided, including the amazing deep field shots of what we assumed was an empty patch of space, the long exposure revealing countless galaxies that were previously invisible, it brings it home to you how successful the device has been. |
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