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
What degradation or other issues occurs at these slower speeds?
Even using these filters at f/3.8 might already result in a small loss of signal - that is - longer exposure time and consequently contrast might suffer a bit. Other than that - due to the mismatch some offband light might reach the chip but it shouldn´t be a huge concern. The most problematic filter is the H-alpha. Both SII and OIII have two emission lines which are close to each-other, so you will still be able to get part of both these lines. H-alpha in comparison to the other two, has a really tight bandwith.
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|Filter Thickness (without cell)||2 mm|
|AR-Coating||dielectrically coated, planeoptically polished|
|Special Features||Maximaler Kontrast für schnelle Astrographen|
|Visual or Imaging?||imaging|
|Filter Usage||CCD, f/2 Highspeed, H-alpha, O-III, S-II|
|Filter mounted||Mounted (LPFC 6mm)|
|Type of Filter||Narrowband|
|Single or Set?||Single Filter|