There is a morning session in which birds fly fast towards or across the camera, quite close in, using focal lengths between 150 mm and 450 mm. This is about as close as you can get to a demanding but repeatable test setup for birds in-flight. There are two displays daily, using more or less the same birds flying in the same sequence in the same way. The HCT provides a pretty good location for testing autofocus hit rate. A Lanner falcon is about the size of wrapped cheese sandwich and flies at over 100mph, and it’s a challenge getting even a focus point on one, so some of these tests are quite extreme. There is a huge range of shooting conditions, from large birds flying fast right at you (and sometimes hitting the camera) to aerial raptor combat, or super fast falcon dives at very long range. The HTC birds are vultures, falcons, kestrels, owls, eagles and kites. I did these tests at the Hawk Conservancy Trust (HCT) in Hampshire, UK. You will see that there are a huge number of misses, and even where there are focus hits, the bird is often out of focus.
#FASTRAWVIEWER MOVE FAVORITES MOVIE#
You can stop the movie at any point to see the EXIF and focus info for any shot. As a result I was able to take a screen video capture of all the shots. The latest version of A7info is quite fantastic, and you can fly through images at Photomechanic speeds. When I did the original analysis of the data below, in August 2020, A7info did not work too well with the A9, so I had to use the much slower and less elegant AFV.exe program, which can take up to 10 seconds per image, and recording the focus accuracy of over 1500 images led to me losing the will to live. This is using the latest v2.6 of the amazing (and misleadingly named) A7info.exe program. This is a fast run-through of the focal point positions of several hundred images. Quick look at the problemīefore going into detail, here is a 2 minute video that shows the problem. Only for ultra nerds, but let’s look at the tests and the data in detail for the A9 alone. Clearly my tests must be wrong ( although others have found the same problems). Like Trump supporters and the US elections, some enthusiasts cannot accept that a) the Olympus can perform better than the Sony, and b) that the Sony only achieved a hit rate accuracy of 49% in my tests. It has caused a certain amount of incredulity or outright dismissal on various forums around the world, particularly those oriented towards Sony cameras. In an earlier post I compared the Sony A9 focus accuracy with that of the Olympus EM1x to get a comparative birds in flight hit rate.
Yorkshire and Northumberland landscapes and seascapes.Richmond Pen Ponds Gulls, Duck, Geese and Terns.Hawk Conservancy Trust try-out for new OM1 camera.
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