Hello: I would like to know, which brand of filters do you recommend for Ha, OIII and SII. and what bandwith to use for best results. Regards, Eric. (México)...
I use Custom Scientific and have had excellent results. We now have about a dozen of these filters and all of them are excellent. Ron Wodaski The New CCD...
You can get them from many astronomy dealers, or from Custom Scientific directly. They do not have much of a web site - you may need to contact them directly....
Hi all, I am looking for an H-Alpha filter to fit a 52mm diameter lens thread. I already own Astronomik filters for 2" eyepieces but I cannot use a step-down...
Gday, Im sure you guys have had to answer this question a thousand times, but my view is that different filters no doubt fit different setups. IM a n00b to...
Eric, You might also want to check out Astomnomik. I learned from AVA they now have these filters in 1.25 and 48mm and I believe they are parfocal with the...
... do you intend to use it for CCD or for tech-pan? If you want to use CCD, then you need a narrow band halpha filter. For tech-pan, the longpass ones like...
Wallis and Provin cover this topic in their book on astro photography. It's been awhile since I have read the book, but I do remember their tests showed that...
Hi there ! You can also get our Astronomik H-Alpha Filter in a normal M52 cell upon request. Clear Skies Gerd Neumann www.gerd.neumann.net www.astronomik.com ...
An opportunity to photographic Jupiter next year was presented to me recently by the Executive Director of ALPO (the Association of Lunar and Planetary...
Hi Group, I have the Astronomik LRGB type 2 filters with built in IR. These filters are suppose to be parafocal and I find when using focusmax with robofocus I...
Hi Chris ! What kind of telescope do you use?? If you have any refracting elements in your system you MUST refocus with all filters. CS Gerd ... [Non-text...
It's fairly common for "parfocal" filters to not quite be exactly parfocal. The faster your focal ratio, the more likely this is. Ron Wodaski The New CCD...
... elements in ... Hi Gerd I am using a C9.25 SCT and a William Optic Apo refractor. I am going to test the filters for parafocal within the same temp range...
... parfocal. ... Hi Ron This is good to know. I use the WO 110mm refrator at it's F6.5 and the C9.25 SCT at either F6.3 or F5. Cheers, Chris Appleton ... ...
Hi Chris ! ... Our filters should be parfocal at the C9.25 when you use it without additional reducers or something like this. But even if you William´s is an...
Dear Don and Group, ... Would you be so kind not to mix up things. Our filtersets have the same thicknesses within several hundereds of a mm. Our oldest...
... going ... the ... without ... William´s is an "Apo" you ... the smallest ... expensive APQs ... and ... shift. This is ... in the ... Hi Gerd Thanks for...
... LRGB ... email ... same ... had ... filter ... problems. ... Hi Eric What is the best way to measure the filter thickness? I received my LRGB Astronomik...
Eric and Gerd, I apologize for that email. It was supposed to be private to Chris. I pulled it immediately within seconds when I realized it was not. It is...
... Chris. ... not. ... to ... Eric's ... the ... than ... imaging ... the ... measurements. ... I ... Hi Don & Gerd I do not want to start any conflicts here,...
To all, For what it's worth, I have Astronomik type II LRGB and probably the most focus sensitive scope out there, the f3.3 Epsilon. I have found them to be...
Hi Don and group, ... I do not understand the meaning behind this. I do not remember any email that I wrote about thickness variations of our filters. ...
Dear Chris & list, ... We use a 500 Euro measuring device that allows the filters to be measured in cell. Otherwise you need to unmount the filters and use a ...
Hi, Eddie, The design for the 1.25" 2000XM filters and the 2" STL11000 is done. The focus right now is for the Kodak full-frame CCDs (ST7-10) and once...
Hi All, When it comes to filters, especially LPR filters, the more I read trying to select the right one and not make an expensive mistake the more confused by...
I find the IDAS filter to be the best solution to LP for imaging. As far as PR filters, I will have to see what some of the other group members feels as I...
Hi Kevin, Thanks tons for your reply! IDAS sounds familiar but I don't recall from where, I'll search & find it. If you happen to know of a place to find them...
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