I've been trying to image the Pelican Nebula in H-alpha, [SII], and [OIII]. The H-alpha and [SII] went reasonably well, but I'm having trouble with the...
that isn't unusual the light pollution is worse in the green part of the spectrum you didn't comment if the gradient is seen before or after calibration if...
Richard, I was afraid you were going to say that. The gradient is visible on each uncalibrated sub-frame and gets progressively worse as the nebula approaches...
i think you answered your own question: "as the nebula approaches the horizon......" it is a good old fashioned light pollution gradient if you use photoshop,...
interesting as a widefield JP I took a closeup at f/12.6 back in 2007 http://www.narrowbandimaging.com/3c461_cassA_mk1sn2_cm10_geg_cs4_s2hao3_page.htm i...
From last night. The Hubble palette version: http://tinyurl.com/5zfye8 The "Natural" color version: http://tinyurl.com/5p3zjn A nosaic with the "Butterfly...
Two supernova remnants, Sh2-224 & Sh2-223, in the same field of view! I don't know if there is other pairs like this and I cant't say are those remnants...
Hi, Something interesting to see: http://astroanarchy.blogspot.com/2008/11/cygnus-trio-in-stereo-pair.html Enjoy! J-P Metsavainio Ps. There is a small...
those look cool JP ... From: hercule1939 To: narrowbandimaging@yahoogroups.com Sent: Wednesday, November 05, 2008 3:06 AM Subject: [NBI] The "Cygnus Trio" as a...
Hi J-P, ... I can see in both versions eg. parallel and crossed vision the stereo effect but using crossed vision in your parallel images makes the effect look...
Hi Rainer, I have some friends living in nearby Vega and they helped to move my telescope about 12 light years to have enough paralax for stereo effect. No,...
Hi all As usual the weather has turned to wet and cloudy and a bout of laryngitis means that I have been able to catch up with some processing and also to have...
Fantastic Gordon... Â how do you get good weather?!! Â we are either rained out, clouded out, or fogged out in winter? Â Possibly prefer the look of the...
Very nice images, Gordon! The Ha dominance gave the Hubble palette a green cast. Did you combine the three emission images in a 1:1:1 ratio. It is a matter...
using halpha for luminance certainly aggravates the problem John is mentioning. Â nice data but i fundamentally disagree with the idea of using halpha as a...
Hi Richard My rationale for using the Ha data for the luminance channel (which is no doubt wrong) is that when I do the colour combining in Maxim DL it appears...
well think about the scenario of the three blobs a bit more and see if that makes sense to you if not ask me tomorrow and I will try explaining it a different...
Hi Richard I think I can see it from the point of view that if you add Ha as a luminance channel to Ha OIII and SII you will end up with Ha OIII/Ha and SII/Ha,...
forget Ha, O3 and S2 assume you have three distinct and non-overlapping Red, Green and Blue blobs None overlap or touch each other now assume you decide to use...
Thanks for the straight and to the point answer Richard, that has explained it more clearly. I hope you understand that we don't all have the same knowledge...
I too have experimented with using Ha for luminance...but I find it just doesnt work.... Â Also, as Richard says, there is no reason for it... Â Case in...
Conditions were not always favourable when I took this image over several nights ( fog banks, bright moon), which shows the vast emission nebula in Cepheus. It...
I am just happy that it made sense in that alternate explanation there's no magic there but there is a concept of logical actions based on truths from science...
that looks like good data but the colors look a bit garish to me Gerhard your red histogram has a shape very different from the other two and that's a...
sure that's fine. I'd like to see it. Just bear in mind that I am terribly busy right now and don't have much time to do imaging except to read the postings on...
Having problems with message search?
Fill out this form to ensure your group is one of the first to be migrated to the new message search system.
