SAGA close up lenses

Phil Rudin · Issue 76, Jan/Feb 2014 · pp. 55–57

Products mentioned: SAGA PRO +15 Extreme, SAGA +5, SAGA +10, SAGA flip adapter, Olympus E-M5, Olympus 60mm macro lens, Nauticam NA-EM5 housing, Inon Z-240 strobes, Nauticam 45 degree finder, Nikon D-800, Nikon D7100, Olympus OMD E-M1

at 1:1 will not all be the same image size. So how do we define what is a 1:1or “life size” photograph or video capture. The term 1:1 or “life size” represents a reproduction ratio where the subject you are photographing is the same size on the image sensor as it is in real life. So if you have set your macro lens to 1:1 and you take a sharp photo of a subject which is 20 mm in length then it should take up the same 20 mm’s on the image sensor or film. If you are using a camera with a 35 mm “full frame” sensor like the Nikon D-800 where the sensor size is 35.9 X 24 mm your subject should have about 8 mm of negative spare on each side if the subject is centered and on a flat plane in the frame. With a 1.5X “cropped” sensor like the one in the Nikon D7100 the sensor size is 23.5 X 15.6 mm so at 1:1 the 20 mm subject would have about 1.75 mm on each side when centered. With a Micro 43 camer…