Optolong Clear Focussing Filter
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Optolong Clear Focussing Filter

£24.00✓ 2 year warranty
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About this product

Model:  opt_clear_focus_125

Optolong Clear Focussing Filter

Optolong Clear focusing filter is designed to pass the visible spectral in the region of 420-680nm at 98.5% transmission

It Could also be used as a luminance filter with telescopes that do not use refractive optics IE Newtonian, Ritchey Chretien and Classical Cassegrain Instruments.

Available in both 1.25" and 2" mounted sizes.

The Optolong Clear focusing filter is designed to highly pass the visible spectral region 420-680nm at 98.5% transmission.

Main Use

The use of astrophotography filters, especially narrowband filters, often results in dim images which can be difficult to focus. A clear focusing filter can be used first to clearly focus the image.

Use with modified DSLRs for higher efficiency and sensitivity by passing visible range with 98.5% transmission.

Also acts as an outstanding dust shield, which prevents the possibility of dust settling on the lens during long time exposure.

Specifications

  • Sbustrate: B270
  • Thickness: 1.85mm
  • Tave:  T>98.5%
  • Surface quality: 60/40
  • Transmitted Wavefront RMS: λ/4
  •  Parallelism: 30s

 

WARNING: Optolong filters are not designed for solar observation. DO NOT LOOK AT THE SUN WITH AN OPTOLONG FILTER. Injury or Blindness can result

 

 

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