Originally posted by jpzk Eric:
A few questions:
Why would you use AF-C vs. AF-S for the test?
Does it really matter?
And why ISO 3200 while some people have been testing with much lower ISO's?
Just curious and I want to peform some of my own tests according to your suggestions.
Thanks,
JP
This is a quick, practical and dirty test that will clearly show the presence of the FF problem. With AF-C settings, the AF assist light will not come on. However, there should be just enough light available for the camera to focus fairly easily.
With not too long lenses (30mm or 50mm) one should be able to hand hold the camera, walk around their home in dim conditions and shoot away.
If the images are bright or overexposed, the conditions are too bright and will probably not show the FF problem.
If the photos are very dark or black, the conditions may be too dark, and the camera may simply not be designed to AF in those conditions.
I like to shoot objects on a table, like a glass. If the FF issue is present, the glass will not be in focus even though the camera had no problem locking on to it. If there are objects closer near the edge of the frame and outside the focus points, those will be clearly in focus. Under brighter conditions, the same shot of this glass would always would give a sharp shot of the glass.
Again, this test is not for quantifying the FF problem or determining the cause, but to help people with an easy method to show the FF problem.
I hope this helps.