What step down adapter is suggested from a 52 mm to "-- mm"?
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: http://www.baader-planetarium.com/en/baader-dslr-2%22-filter-holder-m48sp54.html
#2958052 Baader Lens-Adapter-Ring SP 54/ M52: http://www.baader-planetarium.com/en/baader-hyperion-dt-ring-sp54m52-for-dtadapter-iiandiii-and-hyperion-eyepieces.html
In relation to both Filters' Wavelength Spectrum Response what alternative Filter(s) do you have that has the nearest spectrum response in the 50 x 50mm unmounted version? Preferably 3mm thickness.
The reason for this enquiry is to have a useful 'Luminesence' filter for Lunar and Planetary Astrophotography when the rest of the filters are for Deep Sky Imaging (Baader CCD Complete Filter Set II 50 x 50mm #2459544).
Answer in detail: We are sorry, we never felt the Neodymium-Filter to be of intense enough value for CCD-imaging (but very nice for planetary lucky imaging!), hence it is being handled as perfect visual/videography filter here and only av. cell-mounted in 1 1/4" and 2" (2" being a size which already does serve well for DSLR-imaging and were we have all adapters available to put this filter in front of any DSLR-camera lens - or to use our UFC- filter changer for mounting it in front of any CCD-camera.
The neodymium substrate will become very expensive in 50x50 x3 mm size and we already must go through a lot of glass to cancel out substrates with striae and other pouring defects. If you find someone offering this substrate in that size and thickness, you should very carefully check it for optical defects as most people do not do this careful glass selection, nor do they polish each filter substrate on an auto-deck-polisher, nor do they apply a truly high efficient BBAR-coating on both sides. Actually most are just usurping the name of the substrate while supplying very mediocre optical quality.
If you have evidence of people using our smaller neodymium-filters successfully as "L-filter" substitute in a regular CCD-camera filter wheel, then please let us see the links. If it is reasonable we may enter into such a project - but the resulting price may be double of a cell-mounted 2" filter. Also keep in mind that the 1 mm added thickness will definitely cause some loss in transmission!
Regarding the IR-pass-filter in 2 mm thickness: These are perfect for lucky imaging/videography. Hence 95% of these filters are being sold in the 1 1/4" cell-mounted version in 2 mm thickness. Again - offering this in 3 mm thickness will reduce transmission and not offer enough benefit for regular CCD-imaging (just our 2 ct´s).
But - it will mean you have:
-not the maximum deep sky contrast in light polluted areas
-not the maximum efficiency in really dark areas
->therefore separate filters, a UHC and a UV/IR blocker and maybe the Moon&Skyglow for planetary work are the better solution.
So if imaging efficiency is not your main intention and a compromise is ok you can choose the Moon&Skyglow alone. Otherwise we recommend separate ones.
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...
However - any optician must be able to grind a 2" filter substrate down to 36 mm diameter. Just in case you were to have a very urgent requirement. Sorry - we cannot offer this service ourselves.
If you also use 2" eyepieces, most reducers from 2" to 1.25" like our 2" to 1¼" ClickLock Reducer #2956214 also have a 2"-filterthread included.
¼" and 2" Neodymium Lunar & Skyglow Filter
With integrated IR blocker and Phantom Group Coating¼" and 2" Neodymium Lunar & Skyglow Filter
The best visual and photographic filter for contrast enhancement for all Newtonian and SC-mirror telescopes, we have ever offered! Brighter and sharper than ever! Long a dream for all CCD users, our Skyglow & Moon filter with IR Cut coating !! The filter effect is much more neutral in colour and much brighter thanks for our Phantom Group Coating. If you want to escape a city brightened sky - without taking a trip - the new IR Moon & Skyglow filter is the solution.
Compare with the moon & Skyglow filter before the naked eye, to test the effectiveness. Red and blue colours are extensively strengthened. If you cannot see the GRS (Great Red Spot) due to pollution try this which will allow you to see it.
In order to establish a precise plan area and to maintain the planarity despite the applied forces through the different layers of coating, a high technical effort is necessary. You have to choose from a large amount of raw glass only the best pieces in tension-free annealed quality to even hope for a good final quality may. All too easily, the glass deforms with improper preparation or coating on older evaporation systems. The final product is almost useless, if not greatest of care is taken at every stage of production.
- Selective contrast filter, especially suitable for all reflector telescopes.
- Filters specifics wavelengths especially street lights and skyglow from the Moon without suppressing the visibility of colour and brightness differences. The result is a filter that leaves natural colours intact with RGB significantly enhanced.
- 95% transmission in the selected spectral ranges.
- Fits all standard filter threads and can be combined with other filters
- The filter is also optimised for Astrophotography due to it's full IR-blocking. When used with dSLRs stars are much sharper as the unfocussed IR is blocked.
- Ultra-hard and durable Ion-beam hardened coatings and may be cleaned anytime without fear, ideally with Baader Optical Wonder Cleaning Fluid.
Spectral Curve of the Moon & Skyglow Filter
The adjacent graph shows you the spectral curve of our Neodymium Moon & Skyglow filters. On the horizontal axis, the wavelength in nanometers, and the vertical axis is the transmission amount (opacity) specified in percent.
The area under the curve is the spectral range that can pass through the filter.
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