Filters and Lenses

When it comes to Auroral or Airglow study, every photon counts. Keo Scientific researches and stocks a number of high quality, high efficiency components that can bring enhanced capabilities to our customers' custom-built instruments.

Filters

Auroral and Airglow Filters

We stock a wide range of custom manufactured image-quality narrow-band five-cavity interference filters (1.8 nm to 10 nm FWHM, as well as certain wider-band filters) targeted at auroral and airglow work.

Filters are custom manufactured to Keo Scientific's discerning specifications as to cosmetics, in-band transmission (80% typ.), and out-of-band blocking (better than OD5). When it comes to Auroral and Airglow work, you will not find better filters anywhere.

Some of our more popular stocked filters are 2, 3 and 4 inch diameter 427.8 nm, 557.7 nm, 589.3, 630.0 nm, 777.4 nm, 865.0 nm (10 nm FWHM), wideband with notch at 865 nm, and a selection of appropriate background filters. Among non-interference filters, we stock various diameters of BG3 glass, Wratten 89B or equivalent, and others.

Custom filters are available upon request.

achromats

Compound, Achromat, and Singlet Lenses

For your homebrew projects, Keo Scientific Ltd. can provide a variety of very rare compound lenses, such as Rodenstock, Delft, and Kowa lenses of F0.7 - F1.0. As well, we can supply you with custom-ground and coated doublet achromat lenses, 75 - 100+ mm diameter (100 to 1000 mm focal length), and plano convex 75 - 200 mm diameter lenses (150 to 1000 mm focal length), at a quality equal to or better than that of your favorite optical lens outlet, and at lower cost.

We currently have a large collection of Mamiya and Canon fisheye (all sky) lenses and the (much sought-after) Canon 50mm F0.95 lens in stock.