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Eyepiece Eye Relief: 18mm for 31
By independently moving the upper and lower lens groups
CGEM DX Series
Coma is a common plague of the Newtonian reflector design
Imagers can now gain full efficiency at H-Alpha wavelengths
Lunt Solar 60mm Ha Etalon Filter for Double-Stack of All LS60T Models - LS60FHA Celestron NexImage Eyepiece Eye Relief: 18mm forAbout the Lunt 60mm Ha Etalon Filter for Double Stacking The Lunt 60mm Ha Etalon Filter for Double Stacking is a Double Stack Etalon for all LS60FHa Filters and Lunt Telescopes. This filter does not come with a blocking filter because it is assumed the user will have one already. You cannot use this filter , single or double stacked, without the appropriate blocking filter at any time. Lunt 60mm Ha Etalon Filter for Double Stacking Features This is
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