I decided to see if my Sigma 400 mm F5.6 APO would work for on my G1HD. So I mounted it on an adapter Nikon to micro fourthirds, shot at ISO 800 and went hunting in my garden. No birds to shoot but I managed to find a little butterfly. It would not fill the frame, so I am posting a jpg that was cropped from the 3K by 4K frame to about 2K by 2K. I then put in a file that showed what it appeared as a 100% blowup on Photoshop. I was amazed that the shots came out this well and I will test this lens and if there is interest, write a brief review. All shots were done at f8 and I allowed the camera to set the shutter speed. Depth of field was very narrow. But hopefully, practice will improve the results.