Alstar 2" Moon/Skyglow Filter - Bundle with - 2" 4-Element 2X Barlow Lens

The filter is a multi-band pass filter which transmits a high percentage of light in the visual spectrum. It will enhance contrast when observing brighter objects such as the moon and planets and in the same time will suppress sky glow from artificial lighting and background reflected glow. The filter has a mild effect of darkening the background of the night sky so that the fainter objects will be against the dark background, excellent for observing planets. The filter will fit all standard sized 2" eyepieces and accessories such as Barlow lens etc. It is mounted in a nicely anodized Al alloy housing and is threaded on both sides for stacking with other 2" filters if necessary.

• By rejecting most other light this will cause certain objects to appear more clearly against a blacker background of space
• Very high light transmission exceeding ninety five percent of that light some the portions of the spectrum; while blocking unwanted skyglow and many street light emissions
• It enhances contrast of all reddish details and so this filter can also be used for planetary viewing; as well as of blue details
• Zoom In Twice As Much: Without the barlow lens; the planets would appear so small that hardly any detail would be visible; This 2X Barlow Lens doubles the magnification of the telescope's eyepiece without any significant reduction in optical quality
• Fully Multi-Coating: This Barlow lens utilizes a four-lens design with multiple layers of coating to magnify magnification without reducing contrast; This means that your power-boosted observations will be optimized for sharpness; clarity and brightness