Do you have an example of such an elaborate photograph somewhere online? Sounds pretty nifty.
-Cory On Tue, 4 Sep 2007, Bob Blakely wrote: > Interesting. The chromatic aberration produced by the lens can clearly be > seen. This would not have been evident if the moon were properly exposed - > but then you wouldn't have recorded any of the sisters. > > For stars, nebulae, etc. (not the moon) at high magnification: > > The following requires a properly aligned equatorial mount with sidereal > tracking, a ref converter with as much magnification as you can get and the > entire night in a dark area. > > I: > put on a green filter, focus, take many exposures, > put on a red filter, focus, take many exposures, > put on a blue filter, focus, take many exposures, > > then I triple size each of them. > then I register & stack each color separately, > then I import them into Photoshop, > > then I zero the red & the blue in the green image, > then I zero the green & the blue in the red image, > then I zero the red & the green in the blue image, > I do this because the filters aren't perfect... > Then I combine them, > > Then I balance them for white on the brightest star - unless I want to > accentuate something. > > It's a lot of work, takes an unbelievable amount of time, but carefully > done, it kills the chromatic aberration, reduces noise, sharpens the image > and brings out things that would not otherwise be seen. > > There's probably a much better way to do this, and astronomers out there can > probably help, but this does work. > > Regards, > Bob... > -------------------------------------------------------- > "Life isn't like a box of chocolates . . > it's more like a jar of jalapenos. > What you do today, might burn your butt tomorrow." > > ----- Original Message ----- > From: "Beaker" <[EMAIL PROTECTED]> > > >> Hi Group- >> >> Took a stab at astrophotography last night. >> First try overexposed the moon, but got the Pleiades. Then found a >> good exposure for the moon. >> Stopped while I was still ahead... >> >> It was prime focus with a Stellarvue AT1010. (80 mm, f/6 acromat, and >> Pentax K100D) >> >> http://www.flickr.com/photos/[EMAIL PROTECTED]/1314752257/in/ >> set-72157594414463840/ > > > -- ************************************************************************* * Cory Papenfuss, Ph.D., PPSEL-IA * * Electrical Engineering * * Virginia Polytechnic Institute and State University * ************************************************************************* -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
