Just wondering..anyone w/an ultrablock filter... ..if you hold your Ultrablock filter up to your eye, do you see a diffraction "spike" off to any direction...
Hi George, I will check that out tonight. It wouldn't surprise me if some wavelength of high intensity light comes through at an angle because of filter angle...
Hi George, I tried your experiment last night on lights far and near. I didn't see anything unusual, no spikes. The filter extinguished all the high intensity...
Hi guys, I am new to the group. I currently have a Meade LXD75 SN8 and I ma getting into the astro end of this. I bought a Meade DSI pro and color camera. I...
Hi, I recently purchased 5 extra filter drawers and drawer holder on AstroMart. What a surprise when I discovered that the drawers were 0.037" thinner than my...
Hi Steve, I would avoid buying any filter until you know you really need it. There are many references to astronomy filters on the internet, do a Google...
here are two articles I wrote that speak to things you can do with filters: http://www.narrowbandimaging.com/tricolor_emission_line_imaging_crisp_page.htm ...
Richard, All I can say is WOW. Just looked at your site. Great article. Thank you. You have some of the best images I have ever seen! Great setup. Thanks again...
I received an email from Gerd Neumann about this issue. Gerd said that ~7 years ago he widened the drawer dimensions to accommodate more filters that have a...
I see some great coments, links and charts for different filter combinations as tested on Modifed Canon cameras. Which filters work best on a non-modified...
Hi Matt, someone is sending me their Astronomik 2" LPS and Astronomik Canon "clip-in" LPS for transmission testing, stay tuned. I should have that data for you...
Richard, thanks for the info and letting me know about your testing. Another question I have about filters is about the size needed. I assumed I need the...
Hi Matt, a 1-1/4" filter will certainly vignette the Canon fov, 2" filter size is best. Having said that, sometimes when using focal reducers that already...
Hi, Your un-modified XT already has an internal filter. It's not a nebula filter but it does cut out ONE strong light-pollution emission in very good...
You can fool around with all kinds of filters, but if you want to live the good life under heavy light pollution, the first priority is to mod that camera!...
Hi, I have uploaded to file folder Filter tests file CLS Filters.xls. This file has transmission tests for an Astronimik 2" CLS filter and the Astronimik EOS...
I now better understand the problem the imager had using both CLS filters. Doing a white balance of a white card doesn't work well for both filters. Because of...
Hi Richard, Just took the plunge. Traded a JMI motofocuser on astromart for an astronomiks Ha filter 13 nm. Pretty excited. Already have a televue OIII and...
... From: Steve To: Astroimaging_filters@yahoogroups.com Sent: Thursday, April 03, 2008 6:29 PM Subject: [Astroimaging_filters] Re: What filters for what? Hi...
Hi, the Astronomik EOS CLS clip filter looks like it has more capability to handle blue shift from fast optical systems compared to the Astronomik 2" CLS....
Hi Samir Kharusi, thanks for links to your site. I agree in getting the rebel XT modded, however, I disagree with your IDAS filter suggestion for 2 reasons: 1...
You think? Richard, it's obvious from your tests that there's a huge difference between filters. I've assumed both filters were tested at normal angles...
Hi George, the owner had an issue about different color balance in images, not pollution rejection. That's the difference I was concerned about. You are the...
Hi, every time we discuss sky pollution filters, there is the issue of hitting or missing spectral wavelengths of the common sky pollution wavelengths. My...
I think we would all like to know which filter you end up with that does a sensible job with high pressure sodium and is reasonably priced. Best I ended up...
Anyone out there built a clone of my Rough Science Spectrograph? http://www.samirkharusi.net/spectrograph.html If yes, just take a loooong exposure pointing at...
Hi Samir, Wonderful idea!! Seems you have the potential for an application patent, The Skylight Pollution Analyzer? If I were to make such a device I would use...
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