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

Started May 17, 2012 | Discussions thread
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Re: Oly 45 1.8 with Pana GTC1 converter... works !!!
In reply to azazel1024, May 17, 2012

azazel1024 wrote:

The physical Iris of the lens stays the exact same size. The 45mm lens has a 25mm Iris (45/25 = f/1.8), doubling the focal length to 90mm no matter how you do it results in a 90mm focal length, but you still have the same 25mm Iris as the Iris of the lens in this case is where the aperature blades are located (controlling the iris size). If the Iris placement where to somehow shift (which can't happen without changing the internal optics of the existing lens), the current physical obstruction of the aperature blades even when wide open would result is severe vignetting and the apertature blades would no long be able to control the light levels and DOF of the lens. The result 90mm/25mm = f/3.6.

Wrong. Front element size is what matters. Front-mounted converters have larger front element that the lens. I will post pictures to demonstrate DOF and background blur with and without converter. I used Oly TCON-17 on 45mm F1.8.

The only concern with Pana converter is that from specs its front element is very close to minimum required - 50mm, maybe a bit less, so there may be some vignetting.
Wait for OP's pictures.

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