by stephen63 » Wed May 29, 2013 2:00 pm
Boomer12k wrote:sbraun wrote:I bet the terms "narrow band" and "wide (or broad?) band" have been defined in previous APOD postings, but I'm curious about what these mean--the term "narrow band" being used in this description. I presume it's something like the range of wavelengths to which a CCD or other telescopic collector is "tuned" to capture...or something. Perhaps including a hyperlink--which is so often, and very helpfully, done with postings would be good here--though I understand that after hyperlinking a term 50 times you might assume readers would know it by now! Please know how terrific this site is, and how much I, for one, appreciate all of the work that goes into it. Extraordinary!
Here is a simple explanation...and as you go down the page, you will see why I have not gotten into filters....
The bottom link is to the combined color picture of the filters on M27, one of my favorite objects. It is interesting to note the X pattern in the nebula...I had not noticed that before. Filters can show so much more details to an object.
http://www.astrodon.com/products/filters/narrowband/
http://www.astrodonimaging.com/gallery/ ... ?imgID=148
:---[===] *
Good link, Boomer. That pretty much explains it. They can get quite expensive, for sure.
I saw this image posted on his site and wondered when it would show up here
[quote="Boomer12k"][quote="sbraun"]I bet the terms "narrow band" and "wide (or broad?) band" have been defined in previous APOD postings, but I'm curious about what these mean--the term "narrow band" being used in this description. I presume it's something like the range of wavelengths to which a CCD or other telescopic collector is "tuned" to capture...or something. Perhaps including a hyperlink--which is so often, and very helpfully, done with postings would be good here--though I understand that after hyperlinking a term 50 times you might assume readers would know it by now! Please know how terrific this site is, and how much I, for one, appreciate all of the work that goes into it. Extraordinary![/quote]
Here is a simple explanation...and as you go down the page, you will see why I have not gotten into filters.... :shock: :shock: :shock:
The bottom link is to the combined color picture of the filters on M27, one of my favorite objects. It is interesting to note the X pattern in the nebula...I had not noticed that before. Filters can show so much more details to an object.
http://www.astrodon.com/products/filters/narrowband/
http://www.astrodonimaging.com/gallery/viewer_zoom.cfm?imgID=148
:---[===] *[/quote]
Good link, Boomer. That pretty much explains it. They can get quite expensive, for sure.
I saw this image posted on his site and wondered when it would show up here :wink: