Principal planestress

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Principal planeformula

I downloaded a simple lens (LA7270-E4, Thorlabs) zemax files, and I don’t understand the focal plane and principle plane locations in image space as shown in the prescription, I think they are opposite.

This means the focal plane is pretty much (0.079572 lens units away) located at the image surface and the principal plane is about 500 lens units back, which is more or less where the lens is, and where I would assume the principal plane to be also.

Principal planediagram

It tells the same information shown in the prescription data, but in cardinal points you can decide the first and last surface. It makes it easier to look for specific principal planes in your system if you have a single or multiple lens. I attached an image of the cardinal points for a F=50mm doublet as an example.

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Principal planein Mohr's circle

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Principal planeandprincipalstress pdf

Average Time to Ship 1-3 Days, extra ship charges may apply. Please see product page, cart, and checkout for actual ship speed.

Free delivery to Canada on orders of $100 CAD or more. A delivery charge of $8 CAD will be billed on all orders less than $100 CAD.

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