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Optical Filter Astronomical Bessel, Clear (for focus), 1 1/4 Eyepiece CCD
Optical Filter Astronomical Bessel, Clear (for focus), 1 1/4 Eyepiece CCD

Optical Filter Astronomical Bessel, Clear (for focus), 1 1/4 Eyepiece CCD

$ 36.69

Availability: 100 in stock
  • MPN: Bessel Clear
  • Restocking Fee: No
  • All returns accepted: Returns Accepted
  • Refund will be given as: Money Back
  • Brand: Omega
  • Condition: New
  • Return shipping will be paid by: Buyer
  • Item must be returned within: 14 Days

    Description

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    This filter is NOS of a custom manufacture for an Observatory, for a Bessel Clear filter. It is precisely manufactured with final optical grinding and polishing to the highest standards. The Bessel set is made from specific Glasses at prescribed thickness to achieve universal photometric readings.
    This is the Clear with Cut-On at 340nm, and cut-off NIR. It is used to focus with no color and has the same optical thickness as the other Bessel Filters.
    Filter is mounted in 1 1/4 (28mm) eyepiece ring
    Learn more about the standard Photometric filters for astronomical observation by checking out:
    http://www.ast.cam.ac.uk/AAO/local/www/sl/filter.html
    This filter has a value of seveal hundred dollars!
    If you don't find what you want with a simple search in my BJOMEJAG EBUYER STORE, try a wild card search by using an asterics after the wavelength.
    If you are still not finding a good match, follow my links to Omega's Build a Filter. With a note to the effect that cosmetic seconds are acceptable, you will be surprised how economical an exact match can be.
    Thanks for looking!
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