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SVBONY Diagonal Mirror Bundle with Extension Tube

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$34.99

$ 17 .99 $17.99

In Stock
  • Enhanced aluminum die; the SV221 diagonal mirror is designed with enhanced aluminum mold; which has higher light transmittance and clearer vision
  • 1.25 inches diameter; the SV221 diagonal mirror has a diameter of 1.25 inches; which can be applied to a 1.25 inches telescope and a 1.25 inches eyepiece
  • With a brass pressure ring; the SV221 diagonal mirror has a brass pressure ring; which can prevent surface damage and scratch marks when the eyepiece is used with the SV221
  • Extension tube optical length 45mm; provides extra focuser back travel for for astrophotographic applications
  • Standard 2-inch device; fits in 2" telescope focusers; and accepts 2" eyepieces or accessories


Use the SV221 zenith mirror to obtain an upright image and an upside-down image, with a brass pressure ring the SV221 diagonal mirror can protect the eyepiece from being scratched and not damage the service life of the eyepiece. The SV158 2" extension tube provides extra focuser back travel; which is sometimes needed to achieve focus with certain eyepiece telescope combinations; more back travel is often needed for short-range terrestrial viewing through a telescope; or with use of a field flattener; coma corrector; or focal reducer lens.


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