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We briefly describe technical aspects and specifications of the new UKST H α 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 α 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 α survey of the southern Milky Way with this new filter are excellent.
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Parker et al. (1998) studied this question.
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