Telecentricity in Micro Four Thirds.

Started Oct 30, 2013 | Discussions thread
micksh6 Senior Member • Posts: 2,613
Re: Telecentricity in Micro Four Third

Tom Axford wrote:

The MFT manufacturers claim that their lenses are near telecentric and I see no reason to disbelieve them.

In discussing this it is important to understand what telecentric means.

For a telecentric lens the principal light rays forming the image are parallel to the optic axis (a line through the centre of the lens) when they leave the back of the lens, even at the edges of the image. See this article for a fuller explanation.

It has nothing whatever to do with the distance between the back of the lens and the sensor. But the back element of the lens must be at least as large as the sensor itself for a fully telecentric lens.

m4/3 sensor has 21.6 mm diagonal. From my lenses Oly 75mm F1.8 probably has the largest rear element diameter and it's slightly less than that, no more than 21mm. I don't have F2.8 zooms though.

Other lenses have smaller rear element - Pana 20mm - 18mm diameter, kit lenses even smaller and Samyang fisheye has a tiny rear element.

Judged by that it's hard to find truly telecentric m4/3 lens.

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