A twist of the zoom eyepiece housing changes focal length from 21 mm to 7 mm providing a variety of viewing magnification powers; excellent contrast and sharpness making the zoom also of interest for planetary observing
Exceptionally long 16 mm to 33 mm eye relief range allows eyeglass wearers to enjoy the entire view while still wearing their corrective lenses without vignetting; the Zoom eyepiece lets you change magnification power without physically changing eyepieces
Apparent field of view is 30 degree at 21 mm and 43 degree at 7 mm; rubber traction ring ensures a good grip; the 1.25 inch barrel is threaded for filters; actual magnification range will depend on the focal length of your telescope
3X Magnification Power: Astromania 1.25 inch 3x lens barlow when connected to any 1.25 inch telescope eyepiece; will provide a magnification thrice that of the eyepiece; delivering a clearer effect for astrophotography
Multi Coated: 4 element lenses with multi coated optics design make image more crisp and sharp which will render exquisite images without introducing additional chromatic abberation; while can maintain true color reproduction even in low light conditions