I thought I read somewhere that he used film?
Or he used to use flim, but now digital...?
Stefan
-----Original Message-----
From: Charles Goldsmith [mailto:[email protected]]
Sent: Tuesday, September 30, 2008 10:30 AM
To: [email protected]
Cc: Bob West; [email protected]; [email protected];
[email protected]; [email protected]
Subject: Re: [Texascavers] Cave photo
Kevin, color is added by doing multiple exposures with different
colored filters and combining them, each exposure can be quite short,
depending on how dark it is at your location.
My guess is that on this photo, he did 1 exposure for the cave and 1
for the sky, then combined. There is no way to keep things from
blurring if it was just 1 exposure because of movement, no matter the
equipment.
Charles
On Tue, Sep 30, 2008 at 9:07 AM, Kevin McGowan
<[email protected]> wrote:
I agree with Frank,
I find it impossible to shoot that image unless as Bob said it was an
incredibly sensitive sensor.
Typically astronomy photography takes hours of exposure even with
super
sensitive film or sensors. With the rotation of the earth the sky
will move
since either the stars or the cave need to be still but both can't.
Telescopes track stars and planets and move with them. That blurs any
earth
bound features. If you lock down on an earth bound feature then the
stars
and planets blur. What I find most curious is there's color in his
sky. I
didn't know you could get color unless you exposed for quite a long
time and
with no atmospheric interference. That's Hubble Telescope stuff, I
thought.
He mentioned the canyons being lit by a crescent moon. I've been star
watching many times and even a crescent moon gives a LOT of light
when
trying to take deep space photography.
Also, this shot looks retouched to me. The features are soft on the
horizon
but where the sky and land touch the line is very a very sharp edge.
I've been working with Photoshop for over a decade. Textures have to
match
as well as the over all feel of the image. And this image doesn't
have
the
look of one photograph. Also I'd like to know what sort of digital
image
sensor the average person can use that doesn't scream with noise
after
extremely long exposures. The norm is no longer than 30 seconds.
However,
I've done longer exposures but with shots like this it could take
hours, I'd
guess, to get that much light absorption.
Sorry I just don't buy it.
________________________________
From: Bob West [mailto:[email protected]]
Sent: Monday, September 29, 2008 10:25 PM
To: [email protected]; [email protected];
[email protected]; [email protected]; [email protected]
Subject: RE: [Texascavers] Cave photo
The picture explanation states " Pictured above is single exposure
image".
I clicked on the "pictured above" link and it took me to:
http://www.twanight.org/newTWAN/photos.asp?ID=3001638
This has more story from Wally about taking the photo.
It's got to be a SENSITIVE camera/sensor.
Can you say "image stabilization"??
Bob
________________________________
Date: Mon, 29 Sep 2008 21:14:31 -0500
From: [email protected]
To: [email protected]
Subject: Re: [Texascavers] Cave photo
CC: [email protected]; [email protected];
[email protected]
I'd think the same - Both the interior and exterior could be done
from
one
exposure - but not the SAME exposure. Or at least one adjusted to the
other. OR DARN sensitive filim!
-WaV
On Mon, Sep 29, 2008 at 1:27 PM, Charles Goldsmith
<[email protected]>
wrote:
From talking to someone here at work that does a lot of
astro-photography, he said that Milky Way image is easily less than a
minute exposure, given really dark skies.
However, he also states that the cave image was probably overlaid
from
a 2nd exposure, otherwise you would likely have some movement
indication from inside the cave.
Either way, its a beautiful picture.
Charles
On Mon, Sep 29, 2008 at 12:41 PM, Frank Binney
<[email protected]>
wrote:
Hey Bob--
Cool photo....but I wonder if photo shop was involved. If you
took an
exposure long enough to get that type of detail in the Milky Way,
wouldn't
you get star streaks from the Earth's rotation during the long
exposure
time? Any astro experts out there with an opinion? Or half-astro
experts?
Frank
On 9/29/08 10:20 AM, "Bob West" <[email protected]> wrote:
Cave photo of the day from the 'astronomy picture of the day'
site....
http://antwrp.gsfc.nasa.gov/apod/astropix.html
Very nice!
Bob
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