For adapting any cell mounted Baader 2 inch Filter onto a camera lens with 52mm front filter thread you will need:
#2408166 Baader DSLR 2" Filter-Holder M48 / SP54: https://www.baader-planetarium.com/en/baader-dslr-2%22-filter-holder-m48sp54.html
#2958052 Baader Lens-Adapter-Ring SP54 / M52: https://www.baader-planetarium.com/en/baader-hyperion-dt-ring-sp54m52-for-dtadapter-iiandiii-and-hyperion-eyepieces.html
Based on the SP54 thread, we offer many more adapters for various camera threads, our so-called Hyperion DT-rings. https://www.baader-planetarium.com/en/catalogsearch/result/?q=sp54
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...
Because my regular BAADER S-II 8 and O-III 8.5 filters create much larger and blured stars than Ha 3.5 i am considering to order also ULTRA-NARROWBAND 4.5 nm OIII and SII but before i do that i need to know if this filters produce stars with the same size and similar halo to Ha 3.5 nm ??
Please send me answer or link to sites where i can find this information !
However - there is no standard-ideal configuration of optical surfaces placement within the optical train. If there is a flattener lens involved "anything" can happen. We have seen Halos, produced by flawed coatings of the camera window or produced by reflections stemming from retro-reflection due to the radius of reducer/corrector lenses in the optical train but NOT of the filter coatings (easily visible when rotating the filter itself). We have seen Halos go away when changing the filter distance to the chip plane asf. And if the distances of the filter position between chip plane and reducer of flattener lenses work for 656.3 - it does NOT mean that the same optical distance will work equally well at 501 nm.
We "think" we have done all we can. You will need to judge when putting our filters to the test in your optical train (with the willingness to do some testing and searching for the optimum placement of the filter within the given space).
And when the result does leave something to be desired (and each and every O III-filter on this earth will show more residual halos around very bright objects than an H-alpha-filter), then you possibly could arrange "right of return" with your dealer.
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