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exit pupil f number ratio speed stop number			The D-B telescope wins hands-down in this aspect; the apparent field of view depends only upon the focal ratio of the convex mirror, within the limits of acceptable spherical aberration at the edge of the field. The Digges--Bourne telescope revisited by Whitaker, Ewen A. / Journal of the British Astronomical Association The focal ratio is considered critical because it holds expenses down by reducing the height of the building needed to house the telescope. MOLDING SUCCESSFUL MIRROR PROJECT : ARIZONA CAST TO FASHION 40,000 ... by Daily News (Los Angeles, CA)			foam up foam-backed foamflower foaminess foaming foamingly foamless foamy FOB Fob chain fob off fob watch FoC Foc-=scedil.gif=-ani focaccia focaccia bread focal focal distance Focal distance of a telescope Focal distance, or length, of a lens or mirror focal epilepsy focal infection focal length focal plane focal point focal ratio* focal seizure focalisation focalise Focalization focalize focally Foch foci Focillate Focillation Focimeter focimetry focometer focus focus group focus on focus puller Focus tube focused focused strategy focusing focussed focussing fodder fodder crop			Focal Plane Instrument Focal Plane Package Focal Plane Science Instrument Focal plane shutter Focal Plane Structure Focal Plane Structure Simulator Focal Plane Target Fixture focal planes focal planes focal planes focal point focal point focal point focal point focal point Focal Point Array Focal Point of Maidenhead focal point of the complaint Focal Point on Disaster Evaluation Focal Point Review Focal points Focal points Focal points Focal points Focal points focal power focal power Focal Proliferative Endo and Extracapillary Glomerulonephritis focal property focal radius focal ratio focal reaction Focal Renal Cortical Retention focal ring cataract focal ring cataract focal ring cataract focal ring cataract focal ring cataract Focal Segmental Endocapillary Proliferation Focal Segmental Glomerular Sclerosis and Hyalinosis Focal Segmental Glomerulersclerosis Focal Segmental Glomerulonephritis focal segmental glomerulosclerosis focal segmental glomerulosclerosis focal segmental glomerulosclerosis Focal Segmental Sclerosing Glomerulopathy Focal Segmentary Glomerular Hyalinosis focal seizure focal seizure focal seizure focal seizure focal seizure disorder Focal seizures Focal seizures Focal seizures focal spot focal spot focal spot focal spot focal spot-film distance focal spot-film distance

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