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)
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
What is the band width (nm) of the F2 Highspeed narrow band filters?
Question by: Lynn Krizan on Apr 28, 2017 10:59:28 PM | 1 Answer(s)
I'm sorry but we can't publish this value - to make them work at f/2, we had to use rather unusual values, which we can't publish so far. But if you take a look at the images made with these filters, you'll see that they work - that's better than every transmission graph.
Answer by: Baader Web Team (Admin) on May 15, 2017 2:06:00 PM
I have a set of these. I was imaging at F2.1 with hyperstar. Could I use them at F3.6 or F5.0? (TAK with 0.73 reducer and native F)
What degradation or other issues occurs at these slower speeds?
Question by: Matthew Hughes on Aug 10, 2017 12:24:00 AM | 1 Answer(s)
Taking into account the high speed systems properties, these filters have a shifted CWL (Central Wave Length), where the peak is not congruent with the H-alpha, SII or OIII emission lines. This shift is calculated carefully and tested in such way that the best images can be obtained with very fast focal ratio telescopes. f/2 and f/3.6 are suitably close to each other, so the CWL does cover the range from f/2 to f/3.5. A telescope with an f-ratio of f/5 or f/10 actually might render a weak signal though.
Even using these filters at f/3.8 might already result in a small loss of signal - that is - longer exposure time and consequently contrast might suffer a bit. Other than that - due to the mismatch some offband light might reach the chip but it shouldn´t be a huge concern. The most problematic filter is the H-alpha. Both SII and OIII have two emission lines which are close to each-other, so you will still be able to get part of both these lines. H-alpha in comparison to the other two, has a really tight bandwith.
Answer by: Baader Web Team (Admin) on Aug 16, 2017 3:03:00 PM
PLEASE COULD YOU TELL ME IF THE 2" BAADER H-ALFA SOLAR FILTER WILL FIT A HERSCHELL SOLAR WEDGE.
Question by: RAYMOND on Aug 25, 2019 12:49:00 PM | 1 Answer(s)
While the 2" Filter would technically fit (same housing as our Neutral Density Filters) we have to strongly warn you that this product combination is not approved and does not make sense. The here mentioned H-alpha f/2 Highspeed-Filter is not suitable for Solar Observation in any way, but for the H-alpha lines in Deep Sky Astrophotography. As always with Solar Observation: Only use this product if you feel well informed about its properties and the requirements for safe handling and storage.
Furthermore the Herschel Wedge also reduces the H-alpha light by design because it blocks all wavelenghts, so H-alpha filter behind it would result in a dark image.
Answer by: Baader Web Team (Admin) on Aug 26, 2019 8:07:00 AM
what is the filter thickness of your 2" F/2 high speed narrowband filters say Item 2459399?
Question by: Peter J on Jan 27, 2022 10:47:00 AM | 1 Answer(s)
The filter thickness is 2mm. You find such informations when you scoll down the product page (after you selected the filter size) and then you see a tab "specifications"
Answer by: Baader Web Team (Admin) on Jan 27, 2022 11:14:00 AM
for a scope like the skywatcher esprit 100 reduced to F3.58, which narrowband filters do you think would work best ?? the high speed filters vs the 7nm vs 3.5nm filters ?
Question by: Brent Sprinkle on Dec 16, 2019 11:20:00 PM | 1 Answer(s)
Because of the small aperture and the F 3.58 ration we would recommend 7nm normal filters, not highspeed
Answer by: Baader Web Team (Admin) on Dec 17, 2019 12:59:00 PM
I was wondering if is possible to use these filters combined with the Samyang 135mm at F2.
Question by: Matteo on Mar 22, 2021 12:11:00 AM | 1 Answer(s)
If you have the possibility to insert the filter in between the lens and the camera it will work. If you want to mount a filter in front of the lens, then the f/2 filters are not the right choice, this would be possible with the normal Narrowband filters
Answer by: Baader Web Team (Admin) on Mar 22, 2021 9:45:00 AM
Can you please publish the FWHM of these filters. Its pretty important that the buyer knows this bit of crucial information.
Question by: Ersan on Sep 29, 2020 6:38:00 PM | 1 Answer(s)
We do not publish these values for different reasons for example to not provide production information to our competitors. This is proprietary technology. We let the imaging results speak for themselves. You can find endless reports in the web what these filters can do in terms of results.
Answer by: Baader Web Team (Admin) on Oct 2, 2020 8:09:00 AM