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 ...
Finally tested several filters under what I consider heavy light pollution, my home, on an actual DSO. Almost everyone considers his home site has heavy light...
Excellent and easy to understand comparison study. Great work! If you ever want to run more tests, I would like to know how the Lumicon Deep Sky filter...
Too bad these filters aren't made with the IR/UV blocking coatings. ... From: Samir Kharusi To: Astroimaging_filters@yahoogroups.com Sent: Saturday, February...
... <photoncollector@...> wrote: Thanks for the information, now I know why my Lumicon DS LP filter works so well in LP areas. I use the Astronomik LRGB...
This is really great work - thanks for your efforts Best regards Daniel Calleja Sydney, Australia http://www.users.bigpond.net.au/calleja/ ... From:...
I am about to buy a 20Da and can't get any information on a filter that will put back what was taken away for daytime use. I understand that the difference is...
Alan: I have the 20Da camera and also looking for the filter that Canon says exists to compensate for the 2.5X Red/IR increased capability, hope someone can...
Thanks Eric, I am told it "really" not needed by many people, but there are differences. I feel Canon should know what they are talking about but I am not...
Hi Guys, Maybe you find the required filter here http://www.maxmax.com/aXNiteFilters.htm Another thing is that any aditional glass you put in front of a lens ...
Thanks Rainer, I wa just advised that the aXNite was overkill but good fot the Hutek design. Alan ... [Non-text portions of this message have been removed]...
Hi filter lovers, Let us get to basics. Do you want a filter for protection or a filter for color correction? You cannot do both in one filter. For as precise...
Hi Samir, you wrote "hence a UV filter on each lens was the in-thing. I had them too. DSLRs have UV/IR blocking filters already built-in. As for "protection" I...
Rainer: I was looking for the filter that Canon mentions, just to use it in front of a lens for daylight photography. I donīt use high end lenses on my Canon,...
Hi Eric, A custom white balance can be made in less then a minute and it works the whole day long. Defocus completely your lens and shoot a cloud or any nearly...
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