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p.1 #20 · Sigma 24-105, Nikon 24-120 or ?, Please help with lens selection | |
Just checking back in regarding those two examples of the 24-120. Did a 'shoot off' with my D800 mounted on a weighted camera stand, mirror up, remote release, VR off, AF off, and in camera distortion correction off. Subject was a pair of scientific posters mounted to our lab wall. Camera position was moved such that both poster completely filled the frame at the focal lengths tested (24, 35, 50, 85 and 120). Focusing was manual, in 10x live view.
As I initially surmised, my buddies example is significantly softer than mine. As noted in several online reviews, on an FX camera, it is rather soft, in the far corners, wide open. At all focal lengths, the center was acceptably sharp from f/4.0 on, but much better at f/5.6. Both were better at the wide end, than the long end. For best effect, in the future, I will try to shoot mine at f/5.6 or above, from 24-85mm, and f/8.0 or higher, above 85mm.
Both copies were geometrically horrible with the in camera distortion off. At the wide end, barrel distortion is laughably obvious. It hits neutral somewhere between 35-50, and then steers strongly into pincushion distortion. Assume you will need post shot correction if shooting RAW. Haven't spent much time shooting jpgs with my new to me D800 to ascertain if the in camera correction is good enough. Don't know if turning the in camera correction on changes the RAW files either (anyone)?
Long story short, on a DX body, I would consider my example good-to-excellent, and my friends copy fair-good. FWIW, the last five digits of my lens serial number are a bit above 21,000, while that of my friends, is a little below 6,000. Without testing more examples, it would be difficult to confirm if quality control on these improved with serial number.
Also, I ran the same tests on a 60/2.8 AF-D micro, and a Tokina 100/2.8 macro, that we use here in the lab. Both of those lenses were superb, from a geometry standpoint. The 60 was not sharp in the corners wide open, but was better than the 24-120, at f/4.0 and above. It still took f/5.6 to reach critical sharpness, corner-to-corner. To be honest, I would have been surprised if this was not the case. The Tokina was simply amazing, at f/4 and beyond.
Don't know if that helps at all. I'm pretty happy with my copy of the 24-120, and will use it for general family shots and casual shooting. If I'm reaching for maximum image quality, I'm likely to use one of my fixed focal length options, including some of my older MF glass. Will likely try to start acquiring examples of the newer f/1.8 G FX lenses too. The 35/1.8 DX G lens would be a great, inexpensive addition to your kit, if you don't already have an example.
Whatever you purchase, try to have the option of a return if it does not pass your personal quality test.
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