What's the actual size of your 2" filters in "mm" with and without frame/ring? What step down adapter is suggested from a 52 mm to "-- mm"?
Question by: Waqas Ahmad on Oct 10, 2016 7:54:00 PM | 1 Answer(s)
Do all Baader narrowband filter both UV and IR as well? I am thinking of using them with a Full Spectrum DSLR. Thanks.
Question by: Jon on Nov 1, 2016 11:59:00 PM | 1 Answer(s)
All Baader Planetarium narrowbandfilters are blocking UV and IR, they are made for use with fully unblocked monochrome cameras.
Answer by: Baader Web Team (Admin) on Nov 2, 2016 3:43:00 PM
What are the threads and pitch of your 1.25" and 2" filters?
Question by: Anders G. on Sep 20, 2017 12:55:00 PM | 1 Answer(s)
Our 1.25" filters have a M28.5 male (and M28.5 front female) thread / our 2" filters have a M48 male (and M48 front female) thread
Both thread sizes come with our proprietary pitch - which is not the same for the female and male threads.
This is our own proprietary "emergency solution" for uniting a world were manufacturers all over the world copy from each other - to the point that there are almost a dozen different pitches in use for male and female threads. Traditionally US-companies used to do a UNF-based pitch and the rest of the world went for metric threads - but these do vary from 0.5 to 0.75.
For this reason it does not make sense to publish our non standard pitch because our pitch is made to cope with all existing metric and US-pitch standards - and as said - our solution has evolved from sheer necessity. It is a mixture of a queer pitch and under-/over-dimensioning . We will not want to declare this as a standard and get bashed up for it. It works for us and is a result of 20 years adaptation to fit our filters onto all crazy threads we have seen. And inspite of this - every now and then there comes another "dragonboat-eyepiece" were even our filters may not fit...
Answer by: Baader Web Team (Admin) on Sep 22, 2017 1:43:00 PM
I have a non-modified Pentax K-1 DSLR camera. At the end of my t-ring is a 2" nose that accepts 2" threaded filters. Can I use this successfully for narrowband/Ha imaging on an unmodified Pentax K-1 DSLR camera with good results? I'm not expecting results as good as on a modified camera, but on an unmodified one is there at least some improvement when using this Ha filter and if so, how much? Please help. Thank you.
Question by: John on Oct 15, 2017 4:27:00 AM | 1 Answer(s)
You will see some improvement even with an unmodified camera. But be aware that the exposure time goes up
very much when you only collect Halpha light
Answer by: Baader Web Team (Admin) on Oct 19, 2017 2:31:00 PM
I would like to install your 2" H-alpha 7 nm filter in an Astromechanics lens adapter/controller. However, the threads are located at the back of the adapter, and this means that the filter would thread in with the threads on the lens side, and the filter body facing the camera. I think that this is backwards from the way that the filter would be mounted in a typical filter wheel. I think that the orientation should be immaterial, but is that true? Thank you.
Question by: Kevin McCarthy on Mar 8, 2020 4:43:00 AM | 1 Answer(s)
It shouldn't make any difference, but we always recommend that the more shiny side of the filter faces away from the camera to avoid reflections.
Answer by: Baader Web Team (Admin) on Mar 11, 2020 10:28:00 AM
You state that this filter can be used down to f/2.8. Since I already have one of these filters I wonder if it will be possible to use it with a RASA 8" f/2 that I just bought? What problem may occur and do I really need the ultrafast filter?
Question by: Göran Nilsson on Mar 31, 2020 12:00:00 AM | 1 Answer(s)
There will be significantly less signal arriving at the chip area. The exposure times will then be up to 10 times longer - but still so short that it can only be quantified by comparing the signal strength/exposure times with and without filters. A set of real high speed filters will be inevitable. And it is not just a matter of shifting wavelengths. The filter has to be constructed differently from the coating layer arrangement to avoid strong vignetting.
Answer by: Baader Web Team (Admin) on Apr 2, 2020 10:04:00 AM
Can a H-alpha 7nm CCD Narrowband-Filter be used for viewing in conjunction with the Baader Solar Filter?
Question by: Greg Russell on Dec 11, 2017 2:58:00 PM | 1 Answer(s)
WARNING - using this filter on the sun visually will permanently damage your eye! The CCD narrowband Halpha filters are way to broad for making prominences or solar surface detail in Halpha visible and image will be much too bright for visual use. Halpha filters for solar observations like "SolarSpectrum" filters have 0,7nm. If you combine the CCD narrowband filter with our Astrosolar film you see nothing. Image will be completely black.
Answer by: Baader Web Team (Admin) on Dec 11, 2017 3:26:00 PM
Can you suggest a clear parfocal filter that can help reaching focus with the 7nm 2" version?
Question by: Alain on Mar 16, 2018 7:59:00 AM | 1 Answer(s)
When the light beam goes through a filter the focus point get lay out by refraction to extra focal about a 1/3 of the thickness of the filter. Our clear glass filter: https://www.baader-planetarium.com/en/baader-clearglass-filter-(c)-for-focusing--dust-protection.html
in 2" size has the same thickness like the 7nm Ha filter in 2" and by that it is parfocal. Just click the link <spezification> to find that info when
you´re not sure. The focus shift for 2mm is about 0,7mm and of course the 3mm is then 1mm.
Answer by: Baader Web Team (Admin) on Mar 16, 2018 8:34:00 AM