Baader Planetarium 1.25" H-alpha 35nm Pass Filter with IR-Cut

R1,345.00

Baader Planetarium 1.25" H-alpha 35nm Pass Filter with IR-Cut

The relatively wide bandwidth of Baader's new H-Alpha filter makes it ideal for high contrast imaging of H-II regions.

The Baader "H-Alpha Pass Filter" has a 35nm passband and a peak transmission of approximately 95%.  The same high optical quality and features as the other Baader filters ensures the highest contrast and sharpest images possible.  Baader Planetarium filters are made from striae-free substrates, and actually fine optically polished flat to within 1.25 wave p-v over the entire surface, plane parellel to within 30 seconds of arc.  This important and unique custom step adds cost - but the result is a filter that maintains the full wavefront quality of the telescope without double images or ghosting, even at high magnifications.  Critical to maintaining this level of flatness are Baader's carefully balanced coating designs, whichprevent coating surface stresses from warping the substrate.  Such high flatness enables Baader filters to be used far in front of the focal plane, ahead of star diagonals.  Durability has always been a hallmark of Baader Planetarium.  The multi-layer dielectric coatings are plasma assisted and Ion beam hardened using the latest technology (the coatings are harder than the glass substrate itself).  Baader filters withstand repeated real-world exposure to the elements and physical cleaning.  Users need not leave their precious filters dull and dust encrusted to avoid cleaning - Baader filters may be used and cleaned without fear.

Please enquire when stock is indicated as zero.  Availability is typically within 2 months - please enquire.


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  • Model: BP_43d_2458381
  • Shipping Weight: 0.5kgs
  • 0 Units in Stock
  • Manufactured by: Baader Planetarium


This product was added to our catalog on Friday 05 November, 2010.

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