Optolong L-eXtreme

Formats

  • 1.25″ Mounted
  • 2″ Mounted (48mm thread)

Spectral Transmission

Yellow line is published transmission. Color fill is my independent verification with the filter I tested.

Physical Characteristics of 2″ Filter

  • Filter mount thickness: above threads: 4.92mm; including threads: 6.78mm
  • 48mm threads with 0.75mm spacing
  • Minimal knurling only on top
  • Dual bandpass narrowband filter
  • Inner retaining ring does have notches for easy filter disassembly with a spanner
  • Width of the glass filter without the filter mount is 45.94mm

Real World Tests

Bortle 8, Stock Canon T7, 464mm f.l., f/5.4, ISO3200, 36 min. integration (6*6″). Open full-size image in new tab.
Bortle 8, Full Spectrum Modified Canon 60D, 464mm f.l., f/5.4, ISO3200, 36 min. integration (6*6″). Open full-size image in new tab.

Comparisons to No Filter

Before Image After Image
Stock Canon T7 - No filter vs. Optolong L-eXtreme

Before Image After Image
Full Spectrum Canon 60D - No filter vs. Optolong L-eXtreme

Reader Rating1 Vote
100
Pros
7nm bandpasses provide good contrast and tight stars
Excellent light pollution blocker
Cons
Faint halos on very bright stars created by filter
Not available in clip-in format
90
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