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No autofocus on Panasonic G7 with Metabones Speedbooster on Sigma 18-35

Started Jul 9, 2017 | Photos thread
MOD Tom Caldwell Forum Pro • Posts: 46,360
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The EF mount 4.5mm f2.8 DC EX Sigma Circular Fisheye gives very interesting images and works best with 1:1 crop and not focal reduced.

The EF mount 8-16mm f4.5-5.6 DC Sigma Ultra Wide is fine focal reduced but needs to be used in its designed mode of 3:2 crop as at wide the fixed hood petals will vignette.  3:2 crop is smarter than trying to grind off part of the hood petals

Not that I am asking anyone to emulate me as all this is not to everyone's personal taste or budget.

But merely to show that once the money has been laid out for a good focal reduction or even plain glassless electronic adapter a wider field of opportunity for exotic glass exists.

I am cazy enough to add to my old collection of EF lenses by purchasing new ones for use solely on M4/3 bodies.

I do have a fall back as these lenses could also be used on Canon or Sony bodies with aps-c sensors.

All four can be used successfully on a GM5 but are more sensibly used on my E-M1 with battery pack or GX7/GX85.

The 50-100mm f1.8 is just showing a slight trace of darkening vignette - hardly noticable other than on light coloured images. Just enough to show that the focal reduction effect is taking the image to the very limits of its aps-c image circle but the other lenses seem fine other than what I have already mentioned.

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Tom Caldwell

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