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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...
The optimal f ratio for imaging planets with my camera is f/15 (5x the 2.9 micron pixel size) but am having a bit of trouble reaching this (f/17-f/18 has been the closest). So, wanted to know what the impact would be to image quality etc. if I used this filter with at f/18.
Especially for work in UV, the SLOAN-U filter (#2961707U https://www.baader-planetarium.com/en/filters/photometric-filters/sloansdss-u%27-filter-%E2%80%93-photometrisch.html#425=1695) is a viable alternative to our time proven U-Venus-filters (https://www.baader-planetarium.com/en/baader-u-filter-(venus-and-uv---350nm).html") - offering a very similar transmission window but up to 100 mm sq size: https://www.baader-planetarium.com/en/sloansdss-u%27-filter-%E2%80%93-photometrisch.html
There even is a clever way to hold that huge size filter in front of most any DSLR-lens by obtaining this holder and doing a minimal change that converts this holder from accepting two filters of 2 mm thickness into accepting just one filter w. 3 mm thickness - with a mere screwdriver (sorry for the german Amazon-link): https://www.amazon.de/dp/B07FL3YNHB?pd_rd_i=B08KVZ8VWT&pf_rd_p=5f9972c1-184d-4e29-822a-e867654f66c0&pf_rd_r=5T5PNXXSSA4JVTRSN3QK&pd_rd_wg=6HR08&pd_rd_w=dE1wF&pd_rd_r=e8cc1e1b-747d-4193-acdf-981d7f2e81e4&th=1
A new filter can only remove reflexions caused by the filter, and not those reflexions which are already inside of the telescope.
This new generation of Baader CMOS-filters features:
- Increased contrast, matched for typical CMOS quantum efficiency and s/n ratio
- Reflex-Blocker™ coatings, for largest ever freedom from halos, even under most adverse conditions concerning aux-optics
- Identical filter thickness to existing standards, with utmost care for parfocality
- Blackened edges all around, with filter-lead-side-indicator in the form of a telescope-sided black outer rim, to additionally eliminate any reflection due to light falling onto the edge of a filter
- Each filter coated individually, with sealed coating edge (NOT cut out of a larger plate with coatings left exposed, read more)
- Life-Coat™: evermore hard coatings to enable a non-aging coating for life – even in a most adverse environment
Further information, test reviews, image results...
... can be found on our detailed Blogpost:
New CMOS-optimized Baader Filters
This entry was posted on May 8, 2021Last modified on May 4, 2022.
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