Nebula Filter H-Beta 2.0-inch

Nebula Filter H-Beta 2.0-inchExplore Scientific Nebula Filter 1. 25" H Beta Range from 478nm to 496nm with peak at 489nm. Transmission 94. 5% H Beta Hydrogen is the most abundant element in the universe and many nebulae glow in the light of H beta. This line filter blocks all other wavelengths (and thereby nearly all of the artificial light) and only the emission line of hydrogen beta will pass. This filter fits all standard 2. 0 inch eyepieces and filter wheels.

The rugged Twilight I mount offers smooth

Eye Relief 15mm

Zoom eyepiece offers magnifications ranging from 20x to 60x and is angled at 45° for comfortable viewing

high-performance telescope features genuine HOYA FCD100 extra-low dispersion (ED) glass

such as boat races and mountain climbing

Another great benefit of ultra-wide eyepieces is the ease with which you can gaze

A spreader bar locks against the inside of the legs to secure the tripod even further

A complete redesign of this Dobsonian was necessary to ensure the significantly increased requirements to stiffness and load bearing capacity of the optical components

Lens Elements/ Groups 6 Elements in 3 Groups

5" to 45" to allow for convenient telescope height from child to adult

Focal Length 17mm

this exploration kit is a fun