Dew Heater Bands - (Various Sizes) Telescope Aperture Size:(250 - 271mm) If the filter is torn

If the filter is torn or scratched

Better sharpness on the optical axis due to precise mirror surfaces and the lack of a front plate

Due to their unique design

Working distance of 55 mm from the M48 thread

In the year 1999

Dew Heater Bands - (Various Sizes) Telescope Aperture Size:(250 - 271mm) If the filter is tornIf the optics fog up, this normally means an early end to what could have been a successful astronomy session and there's nothing more frustrating for an Astronomer or Astrophotographer when this happens on rare crystal clear nights. Heater bands reduce the risk of dew on the lens or on the corrector plate by slightly heating the front lens of your telescope just slightly above the surrounding air temperature which prevents the dew settling on the