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Spectra HD 1080: Understanding 30x vs. 20x

Archives: Industrial Automation and Control

sesa269896
Schneider Alumni (Retired)
Schneider Alumni (Retired)

Spectra HD 1080: Understanding 30x vs. 20x

We receive questions asking why the 30X zoom does not have ten times the zoom of the 20X model. Some end users may be confused, thinking that 30X is ten times (10X) more zoom than 20X. To better understand the true optical difference, we looked to John Haag, optical quality engineer at Pelco, for assistance in debunking the myth. John shared with the following important information:

Optical Magnification is the ratio between the focal length of the lens at telephoto and wide-angle.

The D5220 offers an optical magnification of 20X and the D5230 offers an optical magnification of 30X. At face value the D5230 has 1.5X more optical magnification than the D5220. It is not 10X more optical magnification.

The 1.5X increase in optical magnification is 30X ÷ 20X = 1.5X

(not 30X – 20X)

However, the statement that the D5230 has 1.5X more optical magnification than the D5220 is not entirely correct. The D5220 has a focal range of 4.7mm to 94mm. The optical magnification is 94mm ÷ 4.7mm = 20X. The D5230 has a focal range of 4.3mm to 129mm. The optical magnification is 129mm ÷ 4.3mm = 30X.

The D5230 offers a little more field-of-view than the D5220 at the wide-angle position. One way to look at it is that the D5230 offers 1X to 30X optical magnification from wide-angle to telephoto; and the D5220 offers 1.1X to 22X optical magnification relative to the D5230. Or another way is that the D5220 offers 1X to 20X magnification from wide-angle to telephoto; and the D5220 offers 0.9X to 27X optical magnification relative to the D5220.”

30X 20X.jpg

Use this explanation to help customers understand the difference between 20X and 30X with Spectra HD 1080 models. By properly setting expectations and educating our customers, we can avoid confusion and the challenge caused by not meeting expectations, especially when those expectations are based on assumptions rather than a clear understanding of performance.

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bcooper_nwcu_co
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Re: Spectra HD 1080: Understanding 30x vs. 20x

Great explanation, thanks