Hi, Orion is now offering a new Skyglow filter as an imaging filter. They are still offering their regular Skyglow. I suspect that the higher cost imaging...
Can hardly get simpler than this: http://www.pbase.com/samirkharusi/image/106528260/original Three Angstroms per pixel, no tracking mount, 30 second...
Hi, I ordered and received a Baader 35nm bandpass Ha filter. While most are interested in narrowband Ha filters, my interest in this filter was to be used as a...
You got what you have payed for: http://www.baader-planetarium.de/zubehoer/okularseitiges_zubeh/farbfilter.htm#halpha-ccd There is nowhere a claim by Baader...
I am a little mystified at what your gripe is with Baader. You order a 35nm filter on the strength of the curve of a 45nm filter, and you are surprised that...
Then complain at Alpine that they (and not Baader) linked the 35 nm Halpha filter entry: http://www.alpineastro.com/filters/filters.htm#H-Alpha to a probably...
Alpine agreeded to take the filter back for a refund and will update their chart. Alpine has always been good to deal with. Regards, Richard ... While ... 7nm ...
Hi John, I saw the 45nm on the Alpine chart, but thought it a typo at the time of order. In any event, the group now has an independent transmission...
Yes, I saw the earlier post, the smudged one should clean up fine. I have the 7nm Baader Ha and it does a fantastic job.Good luck anyway.John H. [Non-text...
Hi Richard C, yeah, it may be the water. More likely the scotch, vbg. If my testing just brings complaints, I can solve that quickly. If needed I now have a...
Just did one with my Rough-Science Spectrograph and added it at the bottom here: http://www.samirkharusi.net/spectrograph.html Excellent filter! Very slight...
Hi Samir, very nice. How do you calibrate your spectrometer to know the exact bandpass center spectral line and width? Is there anyway you can determine the...
Hi, I just received the older version of the Baader 45nm bandpass Ha filter and transmission tested it. Unfortunately for my application it is still skewed to...
Ha is easy. I just take a spectrogram of the Sun. It has a prominent notch at Ha, so there cannot be much quibbling. I get the Angstroms/pixel from the rest of...
As promised. Rough Science Stellar Spectrography: http://www.pbase.com/samirkharusi/stellarspectroscopy Note: no scope, no tracking mount. If you can see the...
Hi, while looking for a wide band Ha filer to be used as a prefilter for red-shift spectroscopy, I came across a filter manufactured by Lumicon called the...
here are images I took using one back in 2001. this was during the nine months of my astronomy/imaging hobby so you get to see some of my very early work :-) ...
Hi Richard C, yes indeed, you lead the way. I saw one customer review where they panned the Lumicon Ha Long Pass as a deception since it also passed NIR. The...
the old original Lumicon did publish a graph I don't know if I have a copy still or not Again it was designed for use with film. At the time it was created,...
For your purposes its a good idea to block all LP up to the natural [OI] airglow line at 630 nm and have a high transmission already well before Halpha. IMO...
Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the Astroimaging_filters group. File :...
Astroimaging_filters@...
Dec 30, 2008 1:56 pm
2003
Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the Astroimaging_filters group. File :...
Astroimaging_filters@...
Dec 30, 2008 2:00 pm
2004
Jack Marling is the guy that was behind the old original Lumicon. He was also a scientist at Lawrence Livermore Labs, where they design nuclear warheads. He...
Hi Richard C, Lumicon does have the Ha LP chart on their site under the general "filters" heading. I missed it when looking at the specific filter. Regards, ...
Hi Wolfgang, the reason I assumed that the filter is an interference filter is the sharp rise and high transmission as shown in their chart. I will know for...
I got a 2inch UHC filter from Santa that I thought would fit on the inside of my f/6.3 reducer. In order from Camera to scope: DSLR-TRing-Adapter-Reducer-C9.25...
Hi Steve, I don't understand your question. How are you going to attach the filter in the optical train? The focal reducer has a 2" thread like the back of the...
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