bleirer wrote:
Here is a nice article with lots of Macro calculators. To use extension you take the extension length in mm and divide by the lens focal length, then add back any native magnification the lens originally had. So to use a 200mm lens at 1:1 magnification you need 200 mm of extension. Thats going on 8 inches. This will make the aperture 2 stops darker. So a ring flash can be useful.
https://www.cambridgeincolour.com/tutorials/macro-lenses.htm
https://www.cambridgeincolour.com/tutorials/macro-extension-tubes-closeup.htm
Here is a nice article with lots of Macro calculat... (
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