Magnification versus Camera Length
- Practical Electron Microscopy and Database -
- An Online Book -  


This book (Practical Electron Microscopy and Database) is a reference for TEM and SEM students, operators, engineers, technicians, managers, and researchers.



Magnification of a microscope is controlled by the camera length L of the diffraction pattern (DP), and this is given by

           L = D/M --------------------------------------------------------------- [4932]

where D is the distance from the projector crossover to the recording plane (e.g. phosphor screen)and M is the magnification of the image in that plane. For instance, if D is about 600 mm and the screen magnification is 20,000 x then camera length (L) is 0.03 mm.

Different camera lengths are available by turning the magnification knob but this does not affect the imaging magnification when you return to image mode.




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