Oly 45 1.8 with Pana GTC1 converter... works !!!

Started May 17, 2012 | Discussions thread
bobn2 Forum Pro • Posts: 59,605
Re: Rather different than how you put it.

kenw wrote:

bobn2 wrote:

kenw wrote:

EDIT: I cross posted with your addendum. Good job on the diameter estimate. So yeah, wide open the front element has definitely become the aperture stop of the optical system.

No, the aperture stop stays with the diaphragm, so the f-number stays the same with the host lens. Just think, you view the diaphragm through the front element (of the converter)

and its size is controlled by the magnification of the converter, not the size of the FE.

Only true if the entire optical system is large enough that you can still see the entire image of the iris from the front of the lens.

Yes, you are right.

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