Hi, I just finished this picture: http://www.eyeglooobservatory.com/?p=59 I removed the LP gradient using dust/scratches, gaussian blur and apply image...
71555
Ron Wodaski
rwodaski
Aug 8, 2012 8:43 pm
FWIW, the dynamic background extraction tool in PixInsight is about as good as it gets for removing gradients. Ron Wodaski...
71556
Ron Wodaski
rwodaski
Aug 8, 2012 8:51 pm
Short answer: yes. Long answer: * The basic rule for a sub-exposure is based on a simple (but not especially intuitive) fact: there are two kinds of noise in...
71557
mik.schuster
Aug 8, 2012 9:21 pm
My setup is portable, for which the SBIG unit does not seem practical to me. I have been wondering if the MaxIm tracking log might be able to provide some...
71558
Ron Wodaski
rwodaski
Aug 8, 2012 9:31 pm
... Not especially - the resolution is way too slow. Seeing is usually measured at least 100x per second. Anything slower is basically missing some percentage...
71559
mark_manner_spot_obsrv
mark_manner_...
Aug 9, 2012 3:06 am
To add to Ron's note, I also found using an old wedge to be the easiest way to mount and align the unit. Take a look at the link below, and at the top is the...
71560
hilary15xx
Aug 9, 2012 4:36 pm
Hi Wayne, I have written a program that simulates how a CCD works in practice. The program, called SimCCD, lets you see how changing the exposure time will...
71561
Mark de Regt
soccernutsea...
Aug 9, 2012 7:56 pm
Wayne, Ron (of course) gave you an excellent, thorough answer. Despite understanding all of that stuff, I've never taken readings of my images; rather, I work...
71562
Wayne
wayneh9026
Aug 9, 2012 9:42 pm
Thanks everyone. I have limited access to really dark skies, generally two weeks a year at star parties. So my dilemma is how do I spend this limited quality...
71563
Ron Wodaski
rwodaski
Aug 9, 2012 10:00 pm
THose are all OK strategies, it really depends on what you want to accomplish. If you are just curious, and want to get images of a wide variety of objects for...
71564
CurtisC
die_nullte
Aug 9, 2012 10:13 pm
I now live in a dark-sky location, if not the ultimate possible. Even here, where I can leave my scope set up and let things run all night while I'm in bed,...
71565
Mark Acker
markacker
Aug 10, 2012 12:08 am
If you don't already have it, this book is a great starting point. http://www.amazon.com/The-100-Best-Astrophotography-Targets/dp/1441906029 "The 100 Best...
71566
Wayne
wayneh9026
Aug 10, 2012 12:57 am
Thanks, I bought the e-book version and I'm going through it now. Looks good. Wayne...
71567
Bob Franke
bob_franke
Aug 10, 2012 8:31 am
Hello Kelsey, The problem that stands out for me is that you have clipped the data on the bottom end. This has removed much of the faint detail and produced...
71568
glibbins2003
Aug 10, 2012 12:01 pm
I'm curious what this term means in the following context: "if you have enough focal length so you are 'seeing limited'....." "if your sub exposures are...
71569
Kelsey Golden
oldmanklc
Aug 10, 2012 3:07 pm
I did have a bit of trouble keeping detail after applying the LP removal ant the gradient was brightest in the lower right corner. Would that cause the...
71570
Kelsey Golden
oldmanklc
Aug 10, 2012 3:07 pm
The other thing I did is the color conversion in MaximDL, then saved the image as a 16 bit tiff before going over to photoshop, where I saved it again as PSD....
71571
Jeff Armstrong
army5@att.net
Aug 10, 2012 4:43 pm
I would like some recommendations of high quality monitors typically used for photo processing. I currently process my images on my HP laptop but would like ...
71572
Ron Wodaski
rwodaski
Aug 10, 2012 6:13 pm
I use a monitor from this series at Eizo: http://www.eizo.com/global/products/coloredge/index.html The pro models are absolutely incredible, like working live...
71573
Bernard Miller
bgmiller_01
Aug 10, 2012 9:58 pm
I will second Ron's recommendation. I have an EIZO and it is great. Bernard Sent from my iPad ... [Non-text portions of this message have been removed]...
71574
JoeMize
sfojmize
Aug 10, 2012 10:10 pm
I use a Datacolor Spyder4Pro, $145, does an excellent job. My 24" SyncMaster 2494HD is calibrated within 96% of sRGB and AdobeRGB first try. I should be able...
71575
Stan
stan_ccd
Aug 10, 2012 10:20 pm
"Seeing limited" means that the image's true resolution (angular) is "limited" by the atmospheric turbulance called "seeing". There are many potential...
71576
Jeff Armstrong
army5@att.net
Aug 11, 2012 2:47 am
Thanks for the responses. This will help me greatly. Jeff Sent from my iPhone ... [Non-text portions of this message have been removed]...
71577
Bob Franke
bob_franke
Aug 11, 2012 3:21 am
Hi Kelsey, I guess I should have been clearer. By "clipped at the bottom", I mean the bottom of the histogram. This may have been cause by using the...
71578
glibbins2003
Aug 11, 2012 9:33 am
Thanks Stan. Regards, Dave...
71579
dennis284638
Aug 11, 2012 10:04 am
... I did some work on this recently as I have had no clear sky for over six months. I needed to do something to keep me awake! You can see it all here...
71580
phils67
Aug 11, 2012 12:49 pm
While I agree completely with your results, the other end of question isn't answered by your analysis. That end is "what's the longest exposure I can take that...
71581
dennis284638
Aug 11, 2012 1:52 pm
thanks for the response Phil. You don't say what country you are in (!) but here in the UK there is an ever growing number of people taking up astrophotography...
71582
Ron Wodaski
rwodaski
Aug 11, 2012 8:20 pm
Your description is correct. Every object adds its photons to the signal, so even if you have a background brightness of 10,000, and an object brightness of...
71583
Ron Wodaski
rwodaski
Aug 11, 2012 8:26 pm
Well, there is a way to get brilliant results in much less than 30 minutes: get a Takahashi E180, a good DSLR (e.g., Canon 7D, but even less capable camera...
