... 3nm ... depends on what you mean by superior i expect really good contrast and little in the way of internal reflections. sort of all the good qualities...
Mark, Another idea for you. I saw somebody post a real nice image lately that had one channel taken with a Helium filter. Kevin ... an ... believe ... images ...
Is a high end APO really necessary for narrowband imaging, if one could get high quality acromats? Regards, Ken [Non-text portions of this message have been...
Ken, I bought the Schuler business when Chet Schuler retired last year. I just put together 3 of these LRGcBc imaging sets with the 500 nm crossover. The...
Gday all! This image was taken by a member of MelbMeadeScopes in Melourne Australia. I own this group and and would like to show you this young imager's FIRST...
Well that link is incorrect now..Bit silly of me. to view Brad Moore's APOD image go to: http://www.southern-astro.com/gallery.php?PhotoID=9 Thanks for you...
A month or so ago, I asked if anybody had tried imaging with a Halpha ccd filter in conjuction with a baader solar filter for enhancing details on the sun....
Hi Kevin... I saw this ad last week too, and it does look promising. I missed your earlier post on Ha filters, but I have used my Schuler Ha filter with either...
I'm a new imager with a new camera, so please excuse some of the "dumb" questions! I do learn quick however. Is there any advantage to using narrowband filters...
Gary, the H-a and SII filters are red to the eye and the OIII filter is "teal" or blue-green. The color in narrowband images is what you make it to be. There...
Thanks Don! I've got the narrow Ha filter (6nm) since I'm in a rural area, as well as the RGB filters. I had planned on using it for the L channel. To be...
Gary, the 6 nm narrowband filters are fine in light polluted areas or with the moon up. I image with the STL11000XM also, in spite of its lower QE. ABG is...
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@...
Jan 30, 2006 11:20 pm
1157
Kevin: I just posted in message 1156, an image of the Sun taken through Baader´s CaK filter. It is a 1.25" filter that screws to the camera nosepiece. This...
Wow, Eric, that's a pretty nice image. Lots of surface texture. Were you able to image any sunspot activity. This is a very exciting filter if this kind of...
I would agree, very nice. A bit confused though. If you have a safe white light filter at the front, why couldn't the filter be used for visual? Kevin ... ...
Kevin: You get UV through the CaK filter and it can be harmful to the Retina and to the Cornea. Remember that our eye is not sensitive to UV radiation and we...
Would you not get the same UV through the white light filter that is in front of the CaK? If so, I suppose the Baader filters are therefore not safe? Kevin ...
I suspect Eric means use of the CaK filter alone without a solar filter safe for visual use in front. You are right that if you can look at it safely with the...
Hi, as I am new to the group, here my first post. I had asked a question about how the Baader CaK Filter compares to the Coronado CaK Telescope in the Coronado...
Eric just emailed me that when you use the CaK filter you DO remove the visual use ND filter on the Herschel wedge, rendering it unsafe for visual use, and if...
Another "dumb" question from a newby. Is there anything to be gained from using a Ha filter to image galaxies vs. a clear filter for the L channel? Does it...
Perhaps it would show some different detail on one of the closer brighter galaxies due to ha regions in them (like the ha regions we have in our galaxy). I...
Hi Ken I just started using a 12cm f/5 achromat for Ha imaging and results are most promising. Not suggesting the images are in the same league as those shot...
Hi All, does anyone here have a source for an empty filter mount to fit a 1,25" eyepiece with its thread and being capable to house a 1" filter. I would prefer...
Hi (Hallo :-) ), you can get empty cells from Astronomik: www.astronomik.com. In germany you can get them diretly from me: www.gerd.neumann.net The 1,25" cells...
Here's another shot made with an Orion 120ST, 12cm f/5 achromat and Schuler 9nm H-alpha filter. My tracking leaves something to be desired and it looks like I...
Nice work, Jim, Schuler H-a filters these days approach 90% throughput at their 9 nm FWHM. The difference between APOs and less expensive achromats is their ...
Hi Don, Thanks for the thumb up on the NGC 2264 shot. I am incredibly pleased with what I got. A good point regarding focus with the acrhomat and narrow band ...
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