Και η επισημη κολοτουμπα απο το dpreview για το θεμα της εστιασης (αυτο που λιγο πολυ ελεγα και πιστευα , ότι δεν ειχαν διπλα μια Ε-5 και δευτερον εκαναν συγκριση με τις ταχυτητες των περισσότερων μ4/3 φακων που συνηθως σε S-AF είναι ακαριαιες) :
Πριν:
We spent some time shooting with a selection of Four Thirds lenses, including the 14-54mm F2.8-3.5 II and 12-60mm F2.8-4, to get a feel for how well the E-M1 is able to really support Four Thirds users. Our experiences were fairly positive, but only when seen from a 'DSLR trying to do live view' perspective, since the situation is comparable (a camera trying to focus a PDAF-optimized lens, without a standalone PDAF sensor). Focus is usually acceptably fast, though anyone coming from an E-3 or E-5 is likely to find themselves disappointed, in comparison.
Μετά - UPDATE:
Having gone back and spent some more time with an Olympus E-5, I'm inclined to be more positive about the E-M1's behaviour with Four Thirds lenses - not because it's better than I originally stated, but because the E-5 isn't as good as I'd previously thought. Consequently, E-5 users expectations are probably lower than I originally believed. It's also easy to under-appreciate the camera's performance with Four Thirds lenses because it's so fast when using Micro Four Thirds lenses.
However, side-by-side use suggests that, while the E-M1 focuses at a similar speed to the E-5 in good light, it is more prone to occasionally slowing down and juddering the lens into focus than the E-5. This behaviour is particularly apparent when switching focus from distant to near objects or when shooting in moderate-to-good lighting levels (inside a well-lit office with large windows).
Και η συνέχεια μένει λιγο πολύ ως είχε :
Is it as capable as a high-end Four Thirds DSLR would be? We don't think so. But it's certainly usable enough that Four Thirds lens owners will be able to get better-than-ever results with their glass.
The way see it is this: if you're a Four Thirds lens owner and hoping for contemporary DSLR performance, you're going to be disappointed. However, if you want a camera that offers a considerable step up in image quality, that allows you to continue to take great images with your existing lenses and welcomes you into an impressive and growing new system, then you'll be delighted.
Which isn't to say the focus is bad - our first impressions are that the performance is consistent with Canon's EOS 70D, which offers some of the best live view focus of a conventional DSLR. However, for the very best performance, the E-M1 should be used with Micro Four Thirds lenses.
Continuous AF/Tracking
Continuous and tracking AF has been a stumbling block for mirrorless cameras, so far, because contrast-detection AF can't give the camera information about where to focus the next shot. The addition of on-sensor phase detection to the E-M1 promises to improve this - a concept several manufacturers are trying to develop.
Our initial impression is that the E-M1 is a big step forward for Olympus (and Mirrorless cameras in general) - doing a good job of tracking a target and getting a healthy proportion of shots in focus. Having had some time to shoot with the E-M1 out experiences are pretty positive, with perfect focus being achieved in a majority of photos in a sequence (of a moving subject). We'll look in more detail about how consistent the performance is, in our full review.
Και ένα ακόμα
review στο fourthirds-user.com πανω στο θεμα της εστιασης των 4/3 φακων:
" Under most circumstances the E-M1 focuses Four Thirds lenses normally and perhaps even faster than an Olympus E-5.
We have been using lenses like the Zuiko Digital 300mm f/2.8, 90-250mm f/2.8, 150mm f/2.0 and the 50-200 f/2.8-3.5 SWD photographing birds in flight (BIF) perhaps the ultimate challenge for an autofocus system, and as you will discover in our sample image gallery on page 2 of this article we have been able to get some excellent results. We have also been enjoying the use of Micro Four Thirds lenses chasing birds as well thanks to the E-M1's PDAF support in continuous focus (C-AF).
The E-M1 is at least as good as an E-5 and we honestly feel that overall it is actually better thanks to the 26 additional focus points and improved predictive focus and subject tracking algorithms. The E-M1 is not top in class but it is a very respectable performer in action photography conditions, well-aided by up to 6.5 frames per second continuous shooting while continuously focusing.