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 >> >> ________________________________ >> Stay up to date on your PC, the Web, and your mobile phone with Windows >> Live. See Now >> <http://clk.atdmt.com/MRT/go/msnnkwxp1020093185mrt/direct/01/> >> >> > > --------------------------------------------------------------------- > Visit our website: http://texascavers.com > To unsubscribe, e-mail: [email protected] > For additional commands, e-mail: [email protected] > > > > ________________________________ > See how Windows connects the people, information, and fun that are part of > your life. See Now
