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Optec Filters for Astronomical Applications

Optec LPR filter #17266 and Filter Wheel
Above: Optec LPR filter shown (model 17266), with another filter installed in Filter Wheel Magazine (155,224 bytes)

COLOR FILTERS Under Construction

LPR - LIGHT POLLUTION REJECTION FILTERS Under Construction

PHOTOMETRIC FILTERS

OTHER SPECIALTY FILTERS: IR CUTOFF, ETC. Under Construction


Optec Filters - Photometric Sets for Astronomy Optec Filters - Photometric Sets for Astronomy:


Optec UBVRI filters designed to match CCD detectors to the Johnson and Cousins/Bessell systems. These 25.4mm diameter filters are made from Schott glass with a uniform thickness and surface quality. Optec filters are cemented, sealed, and mounted in a 1¼" threaded cell. Each filter is hand polished and certified to ½ wave accuracy per surface.

Optec offers a wide selection of filters for astronomical photometry. Most of these filters were designed for the Optec SSP series of single-channel stellar photometers and are ½" (12.5mm) in diameter. Included in these ½" diameter sets are:
  • Johnson standard UBVRI,
  • three of the Wing 8-color filter set, and
  • the Strömgren uvby four-color set.

A Clear glass filter of BK-7 and the Hß wide and narrow band filter sets are also available in ½" diameter sizes. Each of these filters can be factory mounted directly into the 2, 6 and 10-position filter sliders of the SSP series photometers and also into the 8-position filter wheels of the new Optec SSP-7 High Precision Photometer.

For CCD users interested in larger filter sizes, Optec has developed 1" (25.4mm) diameter filters mounted in 1¼" filter holders threaded for eyepieces and filter wheels manufactured by SBIG and other companies. These filters can be transformed to the Johnson or Kron/Cousins/Bessell systems when used with CCD detectors. For a brief discussion of the Johnson and Cousins/Bessell broadband filter systems, see the paper written by Gerald Persha, President of Optec entitled Johnson vs. Cousins/Bessell Filter Standards, or download the pdf version of this paper.

The use of the Optec filters with CCD detectors is described more fully in the document Model PFE-1 Photometric "Front-End" CCD/Telescope Adapter Technical Manual. This document is available for download in Adobe PDF format from Company Seven's Optec file library.

As part of our Optec MAXfilter 2" Automatic Filter Selector product we also offer 50mm photometric filters for insertion into our 3-position filter sliders. These Johnson/Cousins filters are made to the Bessell specifications.

Refer to the following table to determine which filter should be used for an application.

Optec Stock No.Filter Type and Instrument DetectorFilter Size
17031 Johnson U filter, silicon photodiode or CCD 12.5mm diameter
17032 Johnson B filter, silicon photodiode or CCD 12.5mm diameter
17033 Johnson V filter, silicon photodiode or CCD 12.5mm diameter
17034 Johnson R filter, silicon photodiode or CCD 12.5mm diameter
17035 Johnson I filter, silicon photodiode or CCD 12.5mm diameter
17036 Clear filter, any detector 12.5mm diameter
17037 Wing MA filter, 712nm, any red/IR sensitive detector 12.5mm diameter
17038 Wing MB filter, 754nm, any red/IR sensitive detector 12.5mm diameter
17039 Wing MI filter,1025nm, any red/IR sensitive detector 12.5mm diameter
17041 Johnson U filter, S-5 response PMT 12.5mm diameter
17042 Johnson B filter, S-5 response PMT 12.5mm diameter
17043 Johnson V filter, S-5 response PMT 12.5mm diameter
17045 Stromgren u filter, any detector 12.5mm diameter
17046 Stromgren v filter, any detector 12.5mm diameter
17047 Stromgren b filter, any detector 12.5mm diameter
17048 Stromgren y filter, any detector 12.5mm diameter
17049 Hb narrow & wide filter set, any detector12.5mm diameter
17132 Johnson B filter, silicon photodiode or CCD [View transmission curve]25.4mm diameter
17133 Johnson V filter, silicon photodiode or CCD [View transmission curve]25.4mm diameter
17134 Johnson R filter, silicon photodiode or CCD [View transmission curve]25.4mm diameter
17135 Johnson I filter, silicon photodiode or CCD [View transmission curve]25.4mm diameter
17446 Cousins B filter (Bessell specifications for CCD) [View transmission curve]50mm diameter
17447 Cousins V filter (Bessell specifications for CCD) [View transmission curve]50mm diameter
17448 Cousins R filter (Bessell specifications for CCD) [View transmission curve]50mm diameter
17449 Cousins I filter (Bessell specifications for CCD) [View transmission curve]50mm diameter

Consult our current Astronomical Filter Price List for the filters listed above. Please note the stock number of the required filter.

Optec also supplies Tri-color RGB color separation filter sets and general purpose filters for use with the MAXfield telecompressor and MAXfilter 2" Automatic Filter Selector systems.



Click here to review the current price lists for all Optec products.

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