# Reverse Lens Magnification Calculator

Reverse Lens Magnification Calculator. An approximation is to divide the focal length of the primary lense by the focal length of the reversed lens. which yields the following result: Representing the diameter in millimeters of the image of the front lens shown through the eyepiece.

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How to calculate the macro magnification of a reverse lens? For example. when you reverse a 28mm lens. you get a 3x magnification. P = 1 f = ( n − 1) [ 1 r 1 − 1 r 2 + d ( n − 1) n r 1 r 2] :

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Extension length added. in mm (ie 75): The reverse lens calculator calculates new magnification. new closest focusing distance and effective f/stop with reverse lens setup on extension.

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(focal length is measured from the center of the lens): Equation to calculate the focal length of a lens in air:

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When the previously mentioned 28 mm lens is mounted in reverse on the slr it produces a minimum magnification of about 2:1. My 55 mm macro lens produces slightly more magnification when it is used reversed as opposed to normal mounting.

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The above photo was captured with a macro lens and 68mm of extension tubes. (focal length is measured from the center of the lens):

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Representing the diameter in millimeters of the image of the front lens shown through the eyepiece. This is achieved by use of extension tubes.

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1/f = 1/d + 1/s where f is the focal length of the lens. d is the object distance between object and lens. and s is the image distance between lens and sensor. and. It is defined by the ratio of the diameter of the front lens divided by the magnification.

#### In Reply To Zibri • Apr 26. 2011 A Very Approximate Figure:

That would give the same magnification as 18mm in a cropped sensor. 40x. 100x. 400x and 1000x. The above photo was captured with a macro lens and 68mm of extension tubes.

#### You Can Also Thread The Adapter Onto The Lens First. And Mount The Two Together Onto The Camera Body.

The power of the lens p (in diopters for f in meters) is equal to the inverse of the focal length. f.: 845 posts joined aug 2008. This application has the following macro tools / calculators that will help you take your macro photography to the next level:

#### So. If You Reverse A Lens With A Focal Length Of More Than 50Mm. The Magnification Will Be Less Than 1:1.

Therefore. if the lenss original magnification was 0.15x. then the new magnification will be 0.15x+0.5x=0.65x. Life size often called unity or 1:1 is achieved when the lens is spaced two focal lengths forward of the normal infinity position. This is achieved by use of extension tubes.

#### Further Extension Yields More Magnification.

Equation to calculate the focal length of a lens in air: For example. a pair of binoculars 10 x 42 would have an exit pupil of 42/10 = 4.2 mm. Reverse lens macro photography is a method of capturing highly magnified images using an interchangeable lens camera. a lens. and a cheap adapter.

#### My 105 Mm Lens Produce Significantly Less Magnification When Used Reversed.

With this microscope you can obtain four different magnifications: Extension length added. in mm (ie 75): To calculate the magnification. simply multiply the ocular lens (10x) by the objective lens.