First impressions on Oly 30mm macro

Okapi001 wrote:

Tommi K1 wrote:

Wrong.

One does not apply crop to lens optical magnification.

1:1 is 1:1 regardless of the sensor size.

1:1 is macro magnification. 8x10" field camera has face size macro, 17x13mm has 17x13mm macro.

It is always about reproduction to the life size front of the lens and sensor/film.

1.25x is 1.25x regardless of anything else.

Well, you are wrong. It's like saying 50mm lens is a 50mm lens, regardless of anything else.

Lens optical magnification ratio doesn't change regardless what the sensor is behind it!

Technically true, but it means nothing if you don't know the size of the sensor. 1:1 on a m4 /3 will get you the same image as 2:1 on a full frame.

This is why you will know the sensor size when you are serious about macro.

1:1 is same on all systems. The lens allows sensor to capture its size front of the lens! That is the point!

With a 1:1 lens on a m4/3 sensor you can fill the frame with a 17mm long butterfly, and if you want to fill the frame with the same butterfly on a full frame camera, you will need a lens capable of 2:1 magnification.

You are thinking it totally wrong way!

A 1mm on reality is 1mm on sensor!

That is the idea of macro! Not what size it will be on frame by its sensor size!

WIth your logic we could very well start to say that macro is tied to 8x10" print so if your butterfly doesn't fill a 8x10" print, then it isn't a macro.