**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.