Baader Planetarium Oxygen III (OIII) Filter 1.25: £59.99

Among the best very narrow bandpass Nebula Filters

These are often referred to as light pollution rejection filters but their effect is more encompassing than that alone. This Oxygen III filter is a genuine bandpass filter made so that only a small portion of light in the visual doubly ionized Oxygen III portion of the spectrum is transmitted.

This filter will pass only six (6) nanometer half width centered at 496 and 501 nm Oxygen III lines, with transmission of ninety three (93) per cent of that light in the portions of the spectrum commonly emitted by diffuse and emission nebula (the Veil or Dumbell Nebula for example), and planetary nebulae (Ring Nebula for example).

By rejecting most other light this will cause certain nebula appear more clearly against a blacker background of space. This is among the first two Nebula Filters generally recommended to customers who have a suitable telescopes: premium quality Apo refractors of 80mm and larger, Achromatic refractors of 100mm and larger, or reflectors of 8 inch (20cm) or larger) for the task of hunting out fainter objects.

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