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12 Milky Way Spectrums
Turns your Nikon SLR lens into a Hydrogen Alpha Solar Telescope
80mm Long 2" Diameter Drawtube Extension
Tuning knob allows wing shifting +/- 0
Daystar Off Axis ERF 100mm with 356mm Cap - E-356F100 Telescope Controllers_SkyBT 12 Milky Way Spectrums100mm ERF Glass & 356mm Cap Off Axis For SCT Daystar Energy Rejection Filters (ERF) reduce the heat load on your filter and optics assembly by absorbing reflecting UltraViolet and or Infrared light while transmitting light in the desired visual spectrum. These filters are sometimes Red or Yellow glass, or dielectric IR and UV, but pass light in the desired visual spectrum. The ERF can also serve as an aperture mask to accomplish a straight angle of
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US$ 29.00