G3 heralds the end of APS-C DSLRs

Started May 13, 2011 | Discussions thread
Anders W Forum Pro • Posts: 21,468
Re: and that's before we talk AF micro-adjust! ;-)

ljfinger wrote:

No, it's the ability to move the lens' focusing elements and stop them. In low-light, it's the light available.


Already we're getting to 120 frames per second. As technology improves and that readout speed keeps increasing along with faster processor speeds, CDAF will get better and better.

Still waiting for it to get better. It hasn't gotten much better in the last 10 years or so.

Single-area AF-S:
G2: 0.423 second
GH2 (2010): 0.273 second.

A considerable improvement in just half a year.

PDAF is a very mature technology with some well-documented issues.

Most of which are imagined or largely overcome. I've owned 7 SLRs and about 30 lenses. I've had exactly one problem with one combination of lens/body, and that was corrected as a defect under warranty

That's just your subjective impression. Massive amounts of publicly available data tell a completely different story.

CDAF eliminates those issues while introducing ones of its own. The difference is that the main issue with PDAF (keeping all elements of the imaging path in perfect alignment to ensure accuracy)

That's not the issue with PDAF. The issue is constant and known path length for the two separate optical paths (main sensor/AF sensors).

AF accuracy is certainly an issue with PDAF. This is partly due to the multiple path, partly to other factors.

 Anders W's gear list:Anders W's gear list
Panasonic Lumix DMC-G1 Olympus OM-D E-M5 Olympus E-M1 Panasonic Lumix G Vario 14-45mm F3.5-5.6 ASPH OIS Panasonic Lumix G Vario 7-14mm F4 ASPH +28 more
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