12-31-2015, 09:48 AM
Sigma AF problems wherever I look/read....one subject that pops up more than ever and that's erratic focusing errors with Sigma lenses........especially with the 18-35mm F1.8 zoom as well as the 35MM F1.4......Art series........when a thread is started it goes on ad infinitum......many are on their fifth copy of their lenses....some examples are worse than others, but exhibit the same problem.
The theme is always the same erratic AF in spite of days spent on base station adjustments, front focusing, but everyone has perfect success with CDAF in live view. Then for every ten complainers there's one who has had the lens for a year and never had a missed shot and another who has had the lens two days and finds it's perfect in all situations..........It seems to be more of a problem the wider the focal lengths...........everyone says it's a huge shame!......... So two morals there.........Sigma has to get it together with their PDAF or else they will be losing an enormous amount of customers, word is getting around........the other...... CDAF eradicates the problem, which is what this thread has been debating.
Based on these stories I just couldn't risk a Sigma purchase even with a base station, it's killed it for me!(that doesn't apply to the 150-600 Sport,being a long tele)
I spent yesterday morning re-appraising my two copies of the AF35mm F2Ds, the first copy which I found de-centered now looks fine and needs no AFMA, (I think it could have been a Hoya UV generic fraud may have been the source) the second copy which needed -2 AFMA with a filter now needs +2 without one and is slightly de-centered.........I thought with confidence that I woulld now have spot on LVAF.........but no, both are still front focusing!
If on sensor PDCDAF finally gets to be top top flight (my guess is that will be three years from now at least with Sony) that will leave only one snag left...........poorly calibrated lenses!
PS. Joju my Sigma info is based on the general flood of complaints on Nikon and Pentax sites and doesn't devalue your own findings. Keep us updated on your mirror-less, I'm waiting to hear with bated breath.
The theme is always the same erratic AF in spite of days spent on base station adjustments, front focusing, but everyone has perfect success with CDAF in live view. Then for every ten complainers there's one who has had the lens for a year and never had a missed shot and another who has had the lens two days and finds it's perfect in all situations..........It seems to be more of a problem the wider the focal lengths...........everyone says it's a huge shame!......... So two morals there.........Sigma has to get it together with their PDAF or else they will be losing an enormous amount of customers, word is getting around........the other...... CDAF eradicates the problem, which is what this thread has been debating.
Based on these stories I just couldn't risk a Sigma purchase even with a base station, it's killed it for me!(that doesn't apply to the 150-600 Sport,being a long tele)
I spent yesterday morning re-appraising my two copies of the AF35mm F2Ds, the first copy which I found de-centered now looks fine and needs no AFMA, (I think it could have been a Hoya UV generic fraud may have been the source) the second copy which needed -2 AFMA with a filter now needs +2 without one and is slightly de-centered.........I thought with confidence that I woulld now have spot on LVAF.........but no, both are still front focusing!
If on sensor PDCDAF finally gets to be top top flight (my guess is that will be three years from now at least with Sony) that will leave only one snag left...........poorly calibrated lenses!
PS. Joju my Sigma info is based on the general flood of complaints on Nikon and Pentax sites and doesn't devalue your own findings. Keep us updated on your mirror-less, I'm waiting to hear with bated breath.