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10-11-2015, 12:13 AM   #16
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I use mainly the 1.4x TC specially designed for that lens on the 645 300/4* (I have the A version). If focused properly, pictures are perfectly sharp. I stress the focusing, as non of my two 645D is havin a 100% perfect focus indicator from 300mm upwards. On the other hand using such a long lens, it is easy to focus manually. If doing so and taking my time to set the focus relly perfect, rsults are great. Using a 645Z, off yourse, live view can help.
Uisng the 2x converter the focuing becomes even more critial. I don't rely at all on the focus inidcator there. If focuses properly, f/6.3 to 8 on the lens (f/13-16 in real) are very good, too. Beyond f/16 it becomes soft because too far stopped down, wider open the lens is not yet really sharp using the 2x converter.

Both converters provide clearly more detail than a crop. I've been using the combination with the 1.4x hand held, too. If there is enough light, no problem at all. The combination with the 2x converter is tripod only. It is moving too much when hand held to focus properly. An the 645D doesn't offer enough ISO to get suitable shutter times for hand held pictues at 600mm and f/13 even on a sunny day. The Z will fix that, but not the difficulty to focus.

I use cropping in a diffeent siutation: When uisng the small set, I don't have the 300/4*, I use the 45-85 and the 150-300 instead. The zoom does not support the 1.4x converter and is not suitable for the 2x. So I am chosing to crop when using the 150-300.

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2x, 300mm, 300mm and 2x, 300mm and crop, 645d, 645z, camera, crop or 300mm, gear, medium format, tc
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