Sony A900 - Alpha 24.6MP DSLR Camera Handbuch - Seite 4
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TELESCOPE ADAPTORS
The Sony 'Exmor' CMOS sensor size is 35.9mm x 24.0mm, giving a frame diagonal 43.2mm. The throat clearance I.D.
of the prime focus adaptor needs to accommodate an image circle 43.3mm diameter (allowing 0.1mm clearance)
otherwise the frame corners will be mechanically vignetted.
Prime focus adaptors come in two basic types: the one piece CNC machined with a throat I.D. greater than 45mm, as
manufactured by 'Telescope Adapters', & the two piece that comprises a 2-inch push fit sleeve or nose-piece & a
standard T coupling. Both have a standard 48mm filter thread at the end of the sleeve I.D.
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www.TelescopeAdapters.com
The one piece adaptor has a decided advantage when the focal ratio is slower than f/7.
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PRIME FOCUS
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WILLIAM OPTICS 2-INCH PHOTO-ADAPTOR
The advantage of the two piece
prime focus adaptor is that the
T-adaptor may be swapped for
another SLR/DSLR T-adaptor.
The disadvantage is the
restricted throat depth.