This is my first thread in a discussion section so if there is anything I did that's against the rules, just let me know and I will edit it immediately!
I had been having focus problems on my Nikon 50mm f1.8g. Plus, I recently purchased a Sigma 17-50mm f2.8 which (based on what I read) is notorious for focus problems so I looked up a bit on calibration and did a simple test myself.
What I did was,
- Set my D3200 on my tripod facing the focus test chart on the wall (beside the window at about 1pm)
- Shot 3 shots (RAW) using live view and 3 shots with the viewfinder
- 2 sec self-timer at ISO 100 using center focus point
- Did this for each of my 3 lens
(1)50mm f1.8g Nikon
(2)18-55mm f3.5-5.6 kit lens
(3)17-50mm f2.8 Sigma
- Reduced sharpening in Lightroom to 0
and here are the results I got,
(I only posted 1 live view and 1 viewfinder shot for each lens, but there are more samples in my flickr album - YH, on Flickr)
- Nikon 18-55mm f3.5-5.6 at 48mm f5.6
Live view - https://farm2.staticflickr.com/1602/...03f64f42_o.jpg
Viewfinder - https://farm2.staticflickr.com/1631/...1d405820_o.jpg
- Nikon 50mm f1.8g at 50mm f1.8
Live view - https://farm2.staticflickr.com/1699/...7c52b795_o.jpg
Viewfinder - https://farm2.staticflickr.com/1470/...2c9a09e7_o.jpg
- Sigma 17-50mm f2.8 OS DC HSM at 50mm f2.8
Live View - https://farm2.staticflickr.com/1707/...79a9f311_o.jpg
Viewfinder - https://farm2.staticflickr.com/1689/...b8dd01d9_o.jpg
I am interested in trying out portraiture so sharp focus is really important. The 50mm prime probably needs re-calibration but I am not sure about the Sigma. It seems to have a tiny bit of rear focusing although I don't know if that tiny bit really matters in practice. I am hoping to get some of your advice. Should I bring it down for calibration?