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
Is this the correct filter to use with a 120mm refractor and herschel wedge to control intensity for visual use and for ccd photographing sun with the scope and wedge?
Is an additional infra red cut filter needed for visual and ccd use?
For visual use, you must always use an additional filter behind the Herschel wedge and the ND3 - this may be the Solar Continuum (which is included with the Herschel), another ND-filter or the single 2" polarizing filter #2408342. This filter can be mounted either inside of the 2" eyepiece or in the 2"/1,25"-reducer; if you rotate it, you can change the brightness according to your needs by rotating the eyepiece/adapter.
An additional IR-cut-filter is not necessary for visual use if you use the filters included with our Herschel wedge; it *may* be helpful to achieve sharper images with a CCD if the camera does not have an integrated IR-filter - but then you will usually need the filter for deep-sky-photography, too.
Important Information for Observing the Sun
Polarizer and neutral density filters need additional filtering (for example, Baader Herschel Prism or Baader Astro Solar Safety Film) before the eyepiece of the telescope for observations of the sun. Using without the appropriate filters can cause damage to the these filters and eyesight.
|Filter mounted||Mounted (LPFC 6mm)|