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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...
Since in your catalog the #2458380 is 35nm filter, my question is: there where an old version with same P/N but different band?
Thanks a lot in advance for your help.
The best place for an ERF is always in front of the telescope, not inside of it. At a slower telescope, the energy density is not as high because of the larger image of the Sun, so it will won't get as hot at f/8 as at f/5.6.
We did not perform durability tests with this filter on the sun, because we don't sell them as ERFs, although people use them successfully for this puprpose. So, we can't give any warranties on how long they will last at which f/ratios, but it should work at f/5.6, too. Anyway, we'd recommend that you take breaks during observations, so that the filter has got time to cool down again, and - just as with white-light observation - always cehck all filters before using them.
Obviously the filter will cause a heavy vignette (ok for me), but I need to know how much the filter efficiency changes according to the angle of incidence of the light because I’m using a wide-angle lens (for example wider window band and/or shift). Is there a more appropriate filter to use in front of the lens?
We do not use KG- glass because it does not allow 100% transmitance on the visible spectrum. In this respect, our filters acheive a better result than KG glass.
Please calculate that there are roughly 2.5 mm of thread space remaining in the cell. However - we do not recommend to mount two filters straight into the same cell. This might cause very strong retro reflections.
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