How do you define 1:1 macro ?

Started Mar 1, 2005 | Discussions thread
Juggler Senior Member • Posts: 1,416
Take a photo of a ruler...

Just focus as close as possible to the ruler, and take a picture... if you can cover 23.7mm of the ruler then that means your lens is capable to capture 1:1.. (as the sensor measures 23.7 x 15.6)

Soren H. wrote:
Thanks a lot kramp...

kramp wrote:

Soren H. wrote:

Maybe it's a stupid question, but I don't know how wide my picture
has to be, to achieve 1:1 macro.

I'm playing around with reversed 50mm 1.8 fitted an extension tube,
but how do you define what 1:1 macro is ? How many milimeters in
width must fill my frame to get 1:1 macro ?!

Hi Soren, 1:1 is life size so its the same size in real life as it
is on the sensor and since our sensor is 23.7 x 15.6 your frame
would be that size to get 1:1.

Here is a handy little chart I made up for depth of field and
reproduction ratio's.

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