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In order to realize a sharp , clear viewfinder , the IXY 230 is equipped with a real-image zoom viewfinder ( see Fig. 5 ) that employs an air gap roof ( focusing ) prism developed for the IXY 220 , and five aspherical lens surfaces . Because the androgenic ( masculinizing ) effects of testosterone and anabolic steroids can be permanent , researchers have been cautious about studying these drugs in women . The two main types of meditation are concentration meditation ( focusing ) and insight meditation ( mindfullness ) . I 'd love to see my cable company try to charge me for premium channels in 10 years.My bet will be with those who strip content to smaller pieces ( microchunking ) and float it on the edge . Further details are posted on the Society website ( http://www.royalsoc.ac.uk/funding ) and the deadline is early February 2006 . Oversizing ( underloading ) power units by up to 20 percent will result in little loss in performance or fuel waste . The air gap roof prism is an optical system with an air layer between the prism and the roof ( focusing ) prism so that all the incident light to the roof prism is transmitted while all the outgoing light from it is reflected .