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[vsnet-chat 5793] Re: [AAVSO-DIS] survey, pixy etc



Taichi,
  The Schuler filters follow the Bessell prescription, using
BG39 glass to form the red edge of the bandpass.  That glass
automatically provides "red leak" protection; you do not have
to do anything special.  This should be true for any V-band
filter from any commercial vendor.
Arne

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