Optica b/c was a well respected supply house for amateur astronomers in the 1960's-70's. This set of 5 color filters screw into the bottom of 1.25" standard threaded telescope eyepieces. They are used for observing the Moon, and planets. It is amazing how much different detail comes out on a planet or the Moon when one attaches a color filter to an eyepiece. Each color brings out different features, and fades out others. Made in Japan, these are excellent filters. I had my own set of these as a budding amateur astronomer in the 1970's. Optica b/c items are rare to find. Each filter case is labeled the color, the Wratten #, and a description of what it is used for. There is information on the front and back of each case (see photos). Filters in the set include Green for Mars and Saturn, Blue for Mars and Jupiter, Red for Mars and Jupiter, Orange for Mars and Saturn, Yellow for Moon, Mars, Jupiter, and Saturn. All are in excellent condition. Selling for $60.00 includes Priority Mail.
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