ACCURATE 4 FULL SERIES

The graphs show resolution (MTF50 measure by Imatest) for different lens-camera combinations. This space is too small to try to give a graph of every data point, so there will still be some summary numbers. I’ll show some example graphs of various lens-camera runs to give an idea of what the actual data points look like.

ACCURATE 4 FULL SERIES

One series of shots, discussed here, was removed and not included in these results since the lens used was found to be decentered.

As always, we used cameras and lenses that had recently been tested and found acceptable. We tested a larger number of lens-camera combinations this time around. Which lets me speculate a bit more at the end of the article. That helped me accomplish my main purpose: find out more about how phase detection AF works. Additionally, my “write as you go, not when you know” technique in this series has gotten several knowledgable people to email more thoughts and information. There are a few rather interesting things we found this time around. There don’t seem to be dramatic changes with a few camera-lens combinations like the newer Canon bodies and lenses showed.The newer bodies seem a bit better than the older ones.The Nikon full-frame cameras all do well with center-point, single-shot AF.These tests are fairly blunt tools that are only looking at one tiny aspect of autofocus.Īnyway, if you just want the results, they are pretty straightforward: A few, of course, want to know how they can work in what I found into some raving Fanboy post or other. Sorry, Fanboys, there really isn’t any Canon – Nikon forum fodder here.

Most people, though, simply want to know what I found. Several people wanted to see more data presented, so I’ll try to show more this time. So for the 3 or 4 people who were waiting for this, I apologize for taking so long. Plus, some cool stuff that you really want to play with need to carefully evaluate comes in. That causes an immediate disturbance in the force, and your day job workload triples because there’s a holiday weekend coming up. You ever notice how easy it is to promise to do some work later on? Only then do you realize that what you’ve promised is going to take about 30 hours to get done. I also got several pertinent suggestions and criticisms in the first series about gathering more data and presenting more examples. After that series was done, I promised several people that I would take a similar look at Nikon cameras. It ended up being a bit more than I’d bargained for just with the Canon cameras. I started this series to simply demonstrate a well-known fact that contrast detection autofocus in Live View was more accurate than standard Phase Detection autofocus for still subjects.

Accurate 4 full