Thanks to Dom Bower (Dom's Twitter, Dom's YouTube) for being a guest in this video! Here's a question from a reader about his D7000 and autofocus. It seems the AF system isn't working correctly in his camera, so Dom and I go over a few things to test before sending it in for service. Have you ever had problems with AF in your camera before? What was the resolution?
I have recently been having some Auto-Focus problems, well, I've only recently noticed! It's amazing how the more you shoot, the more you get into Photography, the more you pay attention to the smallest details...
However, back to the topic! lol... I remembered you did a video on Auto-Focusing, and that how you should utilise all your focus points etc, and then there was a minor debate about the focus points within the comments section whereby a viewer was stating that the higher end D3, D3S etc... have more Cross-Type Focus points than the lower end models.
I found recently that my D7000 has been Back-Focusing. Can be quite frustrating as I compose the shot, select the focus point, half-press the shutter, it seems to lock-in, I shoot, then check on the Screen at the back, looks ok... then I zoom in all the way and I see the subject is soft and the back is in sharp focus... incredibly frustrating...
Upon my research, I have found various information.
-I was told it could be the lens needing recalibrating, which means I have to send back to Sigma etc.
-The camera itself needs calibrating, and that I can do some Fine Tuning within my camera.
-Or put simply that my camera doesn't have as many Cross-Type Focus Points and therefore is not as accurate on --some areas.
However, my question to you is, my various lenses back-focus at different focal lengths, and focal distances.
For instance, I used my 50mm f/1.4 on a subject roughly 3 metres away (I know it's not the ideal lens for a Portrait, however it's all I can afford at the moment), and then I found the subject incredibly soft. However, same lens but for a head shot at a distance of half a meter, incredibly sharp.
Similarly, my Sigma at 17mm, it struggled to focus in correctly. I Zoomed into around 24mm and it seemed sharp
To you, does this sound like a Fine Tuning fix or sending lenses back for re-calibration?
It's incredibly frustrating having differnt focusing at different focal/lengths and distances. I would've assumed it would be sharp throughout.
Would love to hear your thoughts on this subject.
Also, it is an another idea for a video to do some AF-Fine Tuning. Could be a follow up to your Auto-Focus video.