H.A.S.I. stands for hemoglobin absorption spectral imaging. With the aid of a special filter attuned to the lighting of the ATMOS i View COLPO, small vessels perfused with blood can be depicted rich in contrast. When tumors grow rapidly, thin, specially shaped vessels are formed to supply the cells with blood, and such vessels are easier to identify using the H.A.S.I. method.

The LEDs used in the ATMOS i View COLPO emit light only in the range of 400 to 800 nm. In contrast to halogen light, the light source itself contains no infrared radiation, which in conventional colposcopes is laborious to filter out and often not completely successful.

The colposcope’s actual magnification depends on the following parameters:

• Objective lens (usually 300 mm with a colposcope)
• Magnification changer setting (0.5 / 0.7 / 1 / 1.4 / 2)
• Eyepiece lenses (usually 16-fold with a colposcope)

Manufacturers that produce only one type of colposcope label the magnification changer with the actual magnification. In that case, the objective lenses (working distances) and eyepiece lenses are nonreplaceable. With replaceable eyepiece and objective lenses, the changer usually just shows the magnification of the changer itself. In the case of the ATMOS i View COLPO with a 300-mm objective lens (working distance) and 16-fold eyepiece lenses, that means:

Magnification changer	0.5	0.7	1	1.4	2
Actual enlargement	4.3	6	8.5	12	17

The formula used to accurately calculate the actual magnification for different objectives and eyepieces can be found in the instruction manual.

The reason for the slightly larger sizing is the high image quality that the ATMOS i View COLPO should achieve right from the start. Similar to cameras used by professional photographers, this requires larger objective lenses for high optical resolution. The reason for this lies in physics/optics with diffraction phenomena of light. This optical resolution differs from the purely technical resolution of a camera chip. The sometimes very high number of pixels or megapixels only makes sense if each individual pixel also receives individual optical information. If 100 pixels all receive the same information due to diffraction phenomena, it makes no sense to specify the pixel resolution only. Therefore, the device needs the existing lens size, which will also make it possible to display 4K images optically in the future.