The Meade #127 2x-3x variable power Barlow has a multicoated achromatic glass doublet lens in a sliding lens cell within the chrome barrel of the Barlow. Sliding the lens back and forth within the barrel changes the Barlow lens/eyepiece spacing and consequently the magnification. There is an engraved power scale on the exterior of the chrome barrel that shows the approximate magnifications at different lens positions within the barrel. The Barlow works best with telescope focal ratios of f/6 and above. A thumbscrew holds eyepieces in place.
There is no mechanical adjustment of the position of the Barlow lens within the chrome barrel. The position is adjusted manually by pushing the lens back and forth within the barrel with your forefinger until the desired magnification is achieved. Be sure to cover your finger with a handkerchief or cloth before adjusting the position of the lens to avoid touching the lens surface and leaving fingerprints.
The Meade #127 variable power Barlow is physically rather long (at 5.3") and is designed to work primarily in the focuser of a reflector telescope. It can be used in a refractor or catadioptric telescope if placed in front of a 1.25" star diagonal, which will markedly increase its effective magnification. It can be used in a refractor or reflector’s 1.25” star diagonal, but will hold the eyepiece quite a distance above the diagonal, making for a possibly inconvenient viewing position. Use in a 2” star diagonal with a 1.25” eyepiece adapter is not recommended, as the 3.75” long chrome barrel of the Barlow may extend down into your diagonal far enough to contact the diagonal mirror and scratch it.
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