Thursday, June 5, 2014

F1.8-2.8 Carl Zeiss Vario-Sonnar T* lens (24-70mm)

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The lens that is used in the new Sony RX100M3 digital camera has  an equivalent of 24mm at the wide end which is also a lot faster (f/1.8-2.8) but this improvement does come with a price: the long end has been decreased from 100mm (as in previous RX100 series) to 70mm.

Here is an excellent explanation from the experts about the Zeiss T* technology:

The numbers in the video are quite amazing: these type of lenses transfer 95-96% of the light that hits the lens surface thanks to the T coding technology. This means that these kind of lenses give maximum amount of contrast and maximum amount of color saturation. The main goal is to get a picture as close as to what the eye sees, and this technology is doing an awesome job at it. The  multi-layered T* coating helps in great reduction of ghost and flare caused by light reflection. So you can see why this technology is vital to good image shooting how it contributes to the stunning image quality that this camera gives you.

Another point is that the optical zoom has been decreased to 24mm-70mm but on the other hand the aperture is faster and goes from 1.8-2.8 (for comparison on previous models these numbers were 28mm-100mm and the aperture was 1.8-4.9).

Quick explanation of aperture in camera


Aperture is the opening of the lens's diaphragm which allows light to pass. This opening has effect on the amount of light that passes through. It is measured if f numbers or so called f stops. And it is inverted: lower f numbers mean more exposure and bigger f numbers mean less exposure. This has effect on the depth of field in images: how sharp or blurry the background is. It is like this: lower f numbers mean blurrier background while higher f numbers mean sharper background. How does aperture affect speed? Low f numbers mean more exposure or more light which further means the shutter can close more quickly since enough light would have passed. And the reverse is true. From here it is clear that greater shutter speed has been gained by lowering the aperture numbers on the new dsc rx100m3 camera.

What does the mm mean on a lens? 


The mm stands for focal length, and lenses that have a range of focal lengths can sometimes be referred to as zoom lenses, as you can easily change the zoom by changing the focal length on your camera. Focal length is the distance between the lens and the point of the camera where the image is formed, it can be measured and it is one of the major characteristics on any camera. The focal length defines the wideangle and the telephoto end on cameras. The most simple definition of a wideangle lens is that it has lower focal length while telephoto lens has bigger focal length. Wideangle is mostly used for capturing the entire scene or landscape photos and the telephoto allows to zoom in on a far away object.



The new lens on Sony DSC-RX100M III is faster and wider than the previous RX100 digital cameras but this comes with a cost on the telephoto power. It has super fast aperture when zoomed all the way out. In combination with the larger than usual image sensor this camera provides better low light performance (since the fast lens allows more light to hit the sensor) and shallower depth-of-field at the telephoto end. To defend the 24-70mm reach it is suffice to say that this zoom range has been standard for many years in full frame camera, so it is not much of a surprise or something unusual. Overall it's an impressive lens that will give you many high quality images and videos.

Have you ever wondered what makes a wideangle a wideangle and a telephoto a telephoto? The answer is focal length. - See more at:

Have you ever wondered what makes a wideangle a wideangle and a telephoto a telephoto? The answer is focal length. - See more at:
Have you ever wondered what makes a wideangle a wideangle and a telephoto a telephoto? The answer is focal length. - See more at: