Technical aspects of the new AAO/UKST H-alpha interference filter

Astronomy and Astrophysics – Astronomy

Scientific paper

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Instrumentation, Photometric Techniques

Scientific paper

We briefly describe technical aspects and specifications of the new UKST H-alpha interference filter which is probably the largest of its kind available in astronomy. Preliminary exposures show that the filter gives excellent imaging with high overall transmission and uniformity at H-alpha wavelengths. This is achieved over a circular area of about 305 mm diameter or about 5.7 degrees (the so called `clear aperture'). The prospects for the new UKST H-alpha survey of the Southern Milky Way with this new filter are excellent.

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