Astrodon 65mm Square Sloan r' Filter

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Astrodon 65mm Square Sloan r' Filter
$900.00
Item # AN-SL-R2-65S
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  • The Astrodon 65mm Square Sloan r' Filter is a high quality scientific filter with an average 50% Transmission point compared to other, similar filters from the same generation and set.
  • Note: Image is of an unspecified Astrodon Square Filter and two round filters. Product being sold is specifically a single r' filter.
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Astrodon 65mm Square Sloan r' Filter



Astrodon's newest generation of Sloan Digital Sky Survey filters are of the highest quality, as usual- improving beyond previous models notably, and even introducing two entirely new filters! This is the r', or red filter. The dielectric coatings used on this filter ensure steep cut-on and cut-offs and peak transmissions in excess of 95%.

It is of note that the Sloan Digital Sky Survey- SDSS- photometric system is the most commonly used filter set today, even being used in the Hubble Space Telescope. Much of photometry up to magnitude 23 will be done in this system with meter-class telescopes.

The r' filter in particular has had it's 50% transmission point increased by a slight but noticeable margin. Increasing from the former 555/695 to the new generation's 562/695, it's a margin worthy of note despite not looking major. After all, a slight alteration can make a world of difference! The r' filter is a red filter, as noted above.

Astrodon r'_65mm Square Sloan r' Filter: Specifications

  • 50% Transmission point of 562/695
  • Peak transmission guaranteed > 95%
  • <=0.03%Tabs out-of-band 300 - 1100 nm
  • Single striae-free fused silica substrates
  • 1/4-wave propagated wavefront prior to coating
  • <0.5 arcminute substrate parallelism
  • 3.000 +/-0.025 mm substrate thickness prior to coating
  • USA Made
AN-SL-R2-65S
Additional Information

Additional Information

SKU AN-SL-R2-65S
Manufacturer Astrodon
Type of Filter Sloan u'g'r'i'z'
Filter Usage Imaging, Visual
Single or Set? Single Filter
Filter Size 65mm
Filter Shape Square
Filter Mounted? Unmounted
Warranty 5 Year Warranty
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