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Bernhard Rupp wrote:
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Why are special-purpose digital cameras for telescopes so much cheaper
than for microscopes?
It is more a matter of what the application demands. If you have
time to adjust gain and exposure each time you take a shot, cheaper
CMOS/USB is a way to go, although even those get expensive beyond the
1.3 Mpix. On automated systems, you need some means of full auto
exposure adjustments, and perhaps need to deal with lower light
conditions which favours CCD. Finally, you can - within limits -
offset low mag optics with a high pix res camera.
Regards, br
It's not so much the number of pixels as the size of the pixels. A
dedicated macro lens can reach low-micron resolution but the dSLR chips
have pixels of 5-10 micron, limiting spatial resolution to ~10-20
micron. Point&shoot digital cameras have much smaller chips and pixels,
leading to noisier images but better spatial resolution (if the optics
is not limiting).
Bart
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Bart Hazes (Assistant Professor)
Dept. of Medical Microbiology & Immunology
University of Alberta
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Canada, T6G 2H7
phone: 1-780-492-0042
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