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External
Since: Mar 18, 2006
Posts: 386
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(Msg. 1) Posted: Mon Feb 25, 2008 2:54 pm
Post subject: best of Hubble images
Archived from groups: rec>photo>equipment>35mm, others (more info?)
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External
Since: Feb 25, 2008
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(Msg. 2) Posted: Mon Feb 25, 2008 3:08 pm
Post subject: Re: best of Hubble images [Login to view extended thread Info.]
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External
Since: Feb 25, 2008
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(Msg. 3) Posted: Mon Feb 25, 2008 3:57 pm
Post subject: Re: best of Hubble images [Login to view extended thread Info.]
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External
Since: May 29, 2006
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(Msg. 4) Posted: Mon Feb 25, 2008 8:39 pm
Post subject: Re: best of Hubble images [Login to view extended thread Info.]
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(Msg. 5) Posted: Tue Feb 26, 2008 12:51 am
Post subject: Re: best of Hubble images [Login to view extended thread Info.]
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(Msg. 6) Posted: Tue Feb 26, 2008 4:16 am
Post subject: Re: best of Hubble images [Login to view extended thread Info.]
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(Msg. 7) Posted: Tue Feb 26, 2008 7:30 am
Post subject: Re: best of Hubble images [Login to view extended thread Info.]
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"Paul Furman" <paul- DeleteThis @-edgehill.net> wrote
> Isn't that the result of terrestrial versus space based observing?
They are a pastiche of IR and visible images, taken with very narrow
band filters, false colored, hand-masked with lots of local contrast
adjustment, and then reassembled.
They have a technique that makes wisps of hydrogen gas
look like a solid cloud reflecting starlight from some off-camera
source. There is no off-camera source and the brightest parts
of the cloud in the manipulated image are the dim outer bits
in a more realistic view.
NASA has made V838 Monocerotis, where the gas is 'illuminated'
(the light source that makes it glow) is inside the ball
.... http://www.noao.edu/outreach/aop/observers/v838monharris.jpg
in real life ... look like a red (and just where did that shade of red come
from?) star peaking out from a rupturing solid sphere.
http://www.nasa.gov/images/content/199918main_rs_image_feature_784_946x710.jpg
where the 'surrounding' stars are brightly lighting up the sphere. There
are no surrounding stars.
Naw, it's the other end of the horse that fits this image.
But the heavy handed manipulation does wonders for funding. Who
wants to look at another dim purple wisp?
--
Nicholas O. Lindan, Cleveland, Ohio
Darkroom Automation: F-Stop Timers, Enlarging Meters
http://www.darkroomautomation.com/index.htm
n o lindan at ix dot netcom dot com >> Stay informed about: best of Hubble images |
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Since: Feb 25, 2008
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(Msg. 8) Posted: Tue Feb 26, 2008 9:32 am
Post subject: Re: best of Hubble images [Login to view extended thread Info.]
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Since: May 29, 2006
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(Msg. 9) Posted: Tue Feb 26, 2008 9:32 am
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(Msg. 10) Posted: Tue Feb 26, 2008 9:32 am
Post subject: Re: best of Hubble images [Login to view extended thread Info.]
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(Msg. 11) Posted: Tue Feb 26, 2008 10:05 am
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(Msg. 12) Posted: Tue Feb 26, 2008 10:05 am
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(Msg. 13) Posted: Tue Feb 26, 2008 11:52 am
Post subject: Re: best of Hubble images [Login to view extended thread Info.]
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* Craig :
> On Tue, 26 Feb 2008 10:05:08 +1000, Troy Piggins wrote:
>
>> * Helen :
>>> On Feb 25, 6:32 pm, Troy Piggins <usenet-0....TakeThisOut@piggo.com> wrote:
>>>> * Paul Furman :
>>>>
>>>>> http://www.dailymail.co.uk/pages/galleries/index.html?in_gallery_id=9...
>>>>
>>>> Not Hubble images, but check out some of this guy's photos. He
>>>> attaches his 20D to a telescope mount.
>>>>
>>>> http://photography-on-the.net/forum/showthread.php?t=450144
>>>> http://photography-on-the.net/forum/showthread.php?t=450156
>>>> http://photography-on-the.net/forum/showthread.php?t=419180
>>>> http://photography-on-the.net/forum/showthread.php?t=451640
>>>>
>>>> Amazing.
>>>
>>> Wow...they truly are amazing. At 1600 ISO, the 20D continues to
>>> impress. Thanks for sharing Troy.
>>> Helen
>>
>> To be fair, he does take multiple long exposure shots and sort of
>> stacks them, running them through some software that removes
>> noise. Still pretty impressive what you can do with a dSLR and
>> telescope mount.
>
> What is most impressive to me is that he is doing this unguided. With no
> dark frames or Flatframes.
Not sure what you mean about dark frames or flatframes. IIUC his
mount turns the camera with rotation of Earth, so no star trails
etc. It tracks for him, allowing crisp stars. The software he
uses takes the different shots he has and removes noise and
brings out detail in the nebulae and fainter stars.
If I come across the link he posted for the software he uses I'll
let you know. Think it was a whole bunch of PS actions that some
astrophotog had put together for enhancement, but it's commercial
not free.
> I've been doing this for a few years and have yet to get to that level and
> I have very similar equipment.
>
> Check out my shots for Comparison please:
> http://www.pbase.com/craigbob/astrophotography
Some nice shots there. Particularly:
http://www.pbase.com/craigbob/image/89360719
Some of the others seem noisy and/or soft?
--
Troy Piggins >> Stay informed about: best of Hubble images |
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External
Since: Feb 26, 2008
Posts: 9
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(Msg. 14) Posted: Tue Feb 26, 2008 11:52 am
Post subject: Re: best of Hubble images [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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On Tue, 26 Feb 2008 11:52:03 +1000, Troy Piggins wrote:
> * Craig :
>> On Tue, 26 Feb 2008 10:05:08 +1000, Troy Piggins wrote:
>>
>>> * Helen :
>>>> On Feb 25, 6:32 pm, Troy Piggins <usenet-0....RemoveThis@piggo.com> wrote:
>>>>> * Paul Furman :
>>>>>
>>>>>> http://www.dailymail.co.uk/pages/galleries/index.html?in_gallery_id=9...
>>>>>
>>>>> Not Hubble images, but check out some of this guy's photos. He
>>>>> attaches his 20D to a telescope mount.
>>>>>
>>>>> http://photography-on-the.net/forum/showthread.php?t=450144
>>>>> http://photography-on-the.net/forum/showthread.php?t=450156
>>>>> http://photography-on-the.net/forum/showthread.php?t=419180
>>>>> http://photography-on-the.net/forum/showthread.php?t=451640
>>>>>
>>>>> Amazing.
>>>>
>>>> Wow...they truly are amazing. At 1600 ISO, the 20D continues to
>>>> impress. Thanks for sharing Troy.
>>>> Helen
>>>
>>> To be fair, he does take multiple long exposure shots and sort of
>>> stacks them, running them through some software that removes
>>> noise. Still pretty impressive what you can do with a dSLR and
>>> telescope mount.
>>
>> What is most impressive to me is that he is doing this unguided. With no
>> dark frames or Flatframes.
>
> Not sure what you mean about dark frames or flatframes. IIUC his
> mount turns the camera with rotation of Earth, so no star trails
> etc. It tracks for him, allowing crisp stars. The software he
> uses takes the different shots he has and removes noise and
> brings out detail in the nebulae and fainter stars.
Dark frames are a way of removing noise from an astroimage. It is an
equivilent length shot as the light frame, just with the lens cap on so all
you get to measure is the noise in shot. this is then subtracted from the
light shots.
A flat frame is short exposure with the camera in the same orientation and
focus to the telescope and shot against a netural background. This is to
used to help remove dust and vingetting and other issues in the optical
train. Again it is used in conjunction with the stacking SW. The Noel
Carboni's Astrophoto tools are a set of actions in photoshop that help in
post processing. They cost about $20.00 and I own it also.
There are many stacking programs available, Registax, Deepsky Stacker,
Images Plus, Registar, etc.... I like Deepsky Stacker. It is free and works
great.
He has a Losmandy G-ll mount and yes it does track the stars. I have the
same mount. Guiding is used to adjust the mount tracking to seeing (the
minor variations in tracking due to atmospheric turbulence, and slop in the
mount's accuracy.
>
> If I come across the link he posted for the software he uses I'll
> let you know. Think it was a whole bunch of PS actions that some
> astrophotog had put together for enhancement, but it's commercial
> not free.
>
>> I've been doing this for a few years and have yet to get to that level and
>> I have very similar equipment.
>>
>> Check out my shots for Comparison please:
>> http://www.pbase.com/craigbob/astrophotography
>
> Some nice shots there. Particularly:
> http://www.pbase.com/craigbob/image/89360719
>
> Some of the others seem noisy and/or soft?
Thanks, I try but I'm an amateur compared to him. >> Stay informed about: best of Hubble images |
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Since: Mar 18, 2006
Posts: 386
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(Msg. 15) Posted: Tue Feb 26, 2008 4:23 pm
Post subject: Re: best of Hubble images [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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Nicholas O. Lindan wrote:
> "Paul Furman" <paul- DeleteThis @-edgehill.net> wrote
>> Isn't that the result of terrestrial versus space based observing?
>
> They are a pastiche of IR and visible images, taken with very narrow
> band filters, false colored, hand-masked with lots of local contrast
> adjustment, and then reassembled.
Oh well, I suppose it's rationalized as enhancing for better scientific
inspection. They do look cool 
> They have a technique that makes wisps of hydrogen gas
> look like a solid cloud... >> Stay informed about: best of Hubble images |
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