Crop body?
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big soft moose
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the word crop refers to the sensor
sensors come in four sizes in DSLRs
the smallest is the four thirds sensor which is largely found in olympus (and some other makes) which is roughly half the size of a fullframe
then you have crop bodies which are usually 1.6 crop (canon) or 1.5 (Nikon and sony etc)
then you have 1.3 crops (not normally known as a crop body) found as far as i know only in the Canon 1D series
Then you have full frame sensors found in the top end pro DSLRs like the 5D2, 1DS series , D3 etc in these the sensor is the same size as a 35mm film frame
It matters because the size of the sensor effects the feild of view (foV) of the lens - thus on a 1.6 sensor like your 50D a 100mm lens will effectively give the maginification of a 160mm on a full frame.
this is good and bad because on the good side it makes longer lenses longer (ie a 500mm telephoto becomes an effective 800mm ) but bad because it also makes the short end not as wide - a 10mm wide angle has the same FoV as a 16mm on a full frame.
(incidentally I say "in DSLRs" because in compacts the sensor can be much smaller which is how they ofer magnification equilvalent to a 300mm lens in a much smaller body. You also get medium format Digital cameras that have a larger sensor than a FF 35mm )
the word crop refers to the sensor
sensors come in four sizes in DSLRs
the smallest is the four thirds sensor which is largely found in olympus (and some other makes) which is roughly half the size of a fullframe
then you have crop bodies which are usually 1.6 crop (canon) or 1.5 (Nikon and sony etc)
then you have 1.3 crops (not normally known as a crop body) found as far as i know only in the Canon 1D series
Then you have full frame sensors found in the top end pro DSLRs like the 5D2, 1DS series , D3 etc in these the sensor is the same size as a 35mm film frame
It matters because the size of the sensor effects the feild of view (foV) of the lens - thus on a 1.6 sensor like your 50D a 100mm lens will effectively give the maginification of a 160mm on a full frame.
this is good and bad because on the good side it makes longer lenses longer (ie a 500mm telephoto becomes an effective 800mm ) but bad because it also makes the short end not as wide - a 10mm wide angle has the same FoV as a 16mm on a full frame.
(incidentally I say "in DSLRs" because in compacts the sensor can be much smaller which is how they ofer magnification equilvalent to a 300mm lens in a much smaller body. You also get medium format Digital cameras that have a larger sensor than a FF 35mm )
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4/3rds is one quarter the area of full frame. APS-C crop format DSLRs are a bit less than half the area of full frame - if they were 1.4x crop factor they would be exactly half.
Crop factor linear, square root is area, ie 1.4 x 1.4 = 2. A typical compact has a crop factor around 5x, and so a sensor area 1/25th the size of full frame. They're flippin tiny, like the size of you little finger nail. Full frame is 24 x 36mm, which is where the image quality comes from.
big soft moose
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yeah Doh - I confused myself thinking about sensor sizes vs crop factors :bonk:
What i really want is for digital backs for my mamiya 645 to come down to a reasonable price - i bet a sensor that size give phenomenal IQ