Chroma O-III filter, 8nm FWHM


  • OIII filters are essential for imaging nebulae and other objects which are rich in ionized hydrogen.
  • At 656.3nm, a narrow-band emission filter is required to separate OIII from the SII doublet (671.6nm and 673.1nm).
  • Parfocal for systems f/4.0 or slower
  • Transmitted wavefront better than 0.25 waves/inch
  • Parallelism: less than 30 arcsec
  • Made in the U.S.A.
Add to WishlistAdd to Compare


Chroma filters are widely recognized as being some of the best in astrophotography. The versatility of Chroma manufacturing is also highlighted in these filters designed for fast telescopes, separate to the standard filters they produce as well. No matter what kind of imaging you’re planning for, these American made filters are sure to satisfy any imager’s needs.


Designed and manufactured here in the U.S.A., you can be sure that these filters will be up to par with the extreme quality control required for astrophotography. On top of this, buyers here in the U.S.A. will not have to wait long at all to receive their filters–so long as they’re in stock, that is! The immense popularity of Chroma brand filters keeps the company at peak performance to maintain supply for an always increasing demand.

Chroma OIII 8nm Narrowband Filters are essential for imaging objects, like nebulae, that are rich in ionized oxygen atoms. These line emission filters work extremely well in heavy light-polluted areas and allow you image on nights when the moon is up.

Chroma’s OIII filters isolate the 500.7nm primary emission line of doubly ionized oxygen. After H-alpha, this is the next most common emission when imaging nebulae

Weight .3125 lbs
Dimensions 3 × 3 × 3 in

There are no reviews yet.

Only logged in customers who have purchased this product may leave a review.

SKU: N/A Categories: , , , Tag: