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Optolong Clear Focusing Filter

RM 78.00

Optolong Clear Focusing Filter

Clear Focusing Filter Mainly Use of astrophotography filters, especially narrowband filters, often results in dim images which can be difficult to focus. 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.

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


Reference Spectrum


This curve is only for reference, and is not used as the final product data.





Coating Technology

  • Multi-layers anti-reflection coating
  • Non-cementing optical substrate coating
  • Optolong filter adopts precision coating based on Ion-assisted deposition coating technology for durability and resistance to scratching, as well as stability on CWL(central wavelength) no deviation affected by temperature change.
  • Planetary rotation system offers precision and homogeneity of coatings ensuring high value on transmission of pass-band and Optical density of off-band.

Contact 011-11230602 For More Information. Available In Stock, 100% Original Local Unit With Full Warranty And Aftersales Service