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A.Y.

Member Since 04 Jul 2009
Offline Last Active Apr 12 2014 04:35 PM
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Posts I've Made

In Topic: Mirror, mirror, on the wall ...

12 April 2014 - 02:01 PM

The area mirrorless cameras have seen the largest improvement this year is in 4k video and extreme low-light perfomance. These 8MP 3840x2160 video frames are more than good enough for many still photography applications, bluring the line between photography and videography.



Footage from Panasonic GH4 with 16MP M43 sensor.



Footage from Sony A7s with 12MP full frame sensor. Check out the ISO 12800 footage at 2:21 - amazing!

Since a full frame sensor is four times the size of M43 this means each of the 4k pixel receives 4 times the light = minimum 2 full stops better high ISO performance. People who have seen the footage in person have this similar reaction:



This new technology will drastically reduce one of the biggest expenses in filmmaking - lighting cost.


In Topic: Sony A7S for 4K - what a disappointment

10 April 2014 - 07:58 PM

Personally I'm very excited. Full frame sensor is four times the size of M43 = 4 times the light each 4K pixel will receive = 2 full stops difference. Look at the price difference between F2.0 vs. F2.8 vs. F4 lens with the same focal range from the same brand!

 

 


In Topic: Mirror, mirror, on the wall ...

18 March 2014 - 10:49 AM

Continuous autofocus (C-AF): C-AF has been a distinct weakness for CSC because contrast-based autofocus must use trial-and-error to determine the direction of focus adjustments, which made it too slow to track moving objects. In contrast, DSLR’s phase-detection AF can predict what focus adjustment is needed and directly drive the lens accordingly. The Nikon 1 CSC introduced on-sensor phase-detection pixels and is still a leader in fast C-AF. Just today Nikon set a new bar for any camera, CSC or DSLR, with the announcement of the Nikon 1 V3, which can shoot 20fps with C-AF. Recent CSC cameras from most brands now also incorporate on-sensor phase detection. My impression is that DSLR still has a small edge, especially with less ideal lighting or subjects, but the gap is closing fast.

 

Video/live-view autofocus: This is an area where DSLR has struggled and CSC is well ahead. Some DSLR now also have on-sensor phase-detection pixels and I expect that over time they will become more competitive with CSC.

 

Autofocus summary: CSC beats DSLR on S-AF, but not by enough to select one over the other. DSLR beats CSC on C-AF but the best CSC probably now match some of their DSLR competitors. Video autofocus goes to CSC.

 

Continuous shooting speed: without mechanical mirror, shooting frequency is limited by read-out and image processing speed on CSC. The Olympus OMD cameras reach 9 or 10fps and the announced Nikon 1 V3 reaches 20fps with C-AF, or 60fps without C-AF. For DSLR the rate at which the mirror can be flipped up and down with adequate precision and reasonable cost becomes limiting. CSC wins and has more potential to continue improving but for underwater photography the real limitation is often strobe recycling.

 

 

Another example how far mirrorless on-sensor phase-detection autofocus system and continuous shooting speed have come in tracking moving subjects like sea lions for photos.

 

Personally, I'll definitely upgrade for AF speed alone.


In Topic: Mirror, mirror, on the wall ...

14 March 2014 - 09:53 AM

 

This shows mirrorless on-sensor phase detection autofocus ability to track moving subjects for video. No contrast detection AF system can do this. Keep in mind that A6000 video AF is deliberately slowed down for smoother movie appearance, the photo AF speed rated 0.06 sec is much faster. Also, a skilled cameraman will be able to keep the focus point on the subject more consistantly to get better AF results.

 

For manual focus, I much prefer mirrorless focus peaking feature over my dSLR optical viewfinder since 9.6x screen image zoom and FP so clearly shows the razor thin DOF moving across the subject and when the peaking reaches the right spot - click!


In Topic: The new Mac Pro and Premiere Pro

11 March 2014 - 09:09 AM

AY, that's a 3rd party "send it in" upgrade, not a plug and play like "normal" computers.  I'm sure someone will figure out a GPU upgrade as well but sending the machine out is sometimes impossible.  Design pros and cons!

 

Mac Pro uses LGA 2011 socket so it's easy to DIY.