Wednesday, 4 January 2012

Lesson 2: reversed lens as a close-up lens

- load (open) the 28.5mm wide angle lens for SLR (28.24mm)
- invert all
- shift all lenses by -52mm
- load (open&add) the 100mm telephoto lens (99.74mm)

the calculated magnification = 99.74mm / 28.24mm = 3.53 (or 3.53:1)

- switch to simulation mode
- do not move the sensor (telephoto lens is focused to infinity)
- decrease the object distance until focus reaches the sensor (39mm)
- switch on the second object
- give some angle or height to any object
- read the measured magnification

measured magnification = 3.53

- select lenses from No. 1 to No. 7 (elements of the wide angle lens)
- move them along Z axis by uppermost adjustment
- let see how independent the magnification is

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