Magnification Leica DVM 6 vs. Smartzoom 5

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user-4053
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Joined: Thu Jan 01, 1970 1:00 am

Magnification Leica DVM 6 vs. Smartzoom 5

Post by user-4053 »

Leica is calculating the magnification on the basis of a 27 Inch (69 cm) diagonal monitor display (See: http://www.leica-microsystems.com/scien ... icroscope/)

By using such a large diagonal, the digital magnification is increased, although the optical magnification is comparable to the Smartzoom magnification.

If we only compare the optical magnifications without considering the sensor and display diagonal, we get following comparison.


Magnification Range Comparison (without considering the sensor and display diagonal)

(1.)
Leica PlanAPO FOV 43.75 0.17x - 2.80x
ZEISS PlanAPO 0.5x 0.28x - 2.80x

(2.)
Leica PlanAPO FOV 12.55 0.61x - 9.75x
ZEISS PlanAPO 1.6x 0.835x - 8.35x

(3.)
Leica PlanAPO FOV 3.60 2.13x - 33.995x
ZEISS PlanAPO 5x 2.5x - 25x



If DVM 6 would be displayed with on the Smartzoom Monitor (445 mm display diagonal), we would get following digital magnifications

(1.)
Leica PlanAPO FOV 43.75 10.17x - 162.74x
ZEISS PlanAPO 0.5x 11.32x - 113x
Leica PlanAPO FOV 43.75 calculation:
445 mm / 7.649 mm * 0.1748 = 10.17x
445 mm / 7.649 mm * 2.7973 = 162.74x


(2.)
Leica PlanAPO FOV 12.55 35.43x - 567.23x
ZEISS PlanAPO 1.6x 33.78x - 337x
Leica PlanAPO FOV 12.55 calculation:
445 mm / 7.649 mm * 0.609 = 35.43x
445 mm / 7.649 mm * 9.751 = 567.23x



(3.)
Leica PlanAPO FOV 3.6 123.6x - 1977x
ZEISS PlanAPO 1.6x 101x - 1011x
Leica PlanAPO FOV 3.6 calculation:
445 mm / 7.649 mm * 2.125 = 123.6x
445 mm / 7.649 mm * 33.995 = 1977x





Formula to calculate the digital magnification:
Magnification = Viewport Diagonal / Sensor Diagonal * Maximum Magnification Optical Zoom * Magnification Objective Lens

E.g.
ZEISS Smartzoom 5:
445 mm / 11 mm * 5 * 5 = 1011x Magnification
See also: http://forums.zeiss.com/microscopy/comm ... php?t=1699

E.g.
Leica DVM 6:
OnSemi CMOS sensor MT9J003 with 7.649 mm sensor diagonal

PlanAPO FOV 43.75:
7.649 mm / 43.75 mm = 0.1748 magnification at lowest optical zoom
0.1748 * 16 = 2.7973 magnification with 16x optical zoom
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