Sony SLR Range

Started Jan 30, 2013 | Discussions thread
quatpat Contributing Member • Posts: 944
Re: Sony SLR Range

EinsteinsGhost wrote:

TrojMacReady wrote:

phiri wrote:

Frenske wrote:

Endos wrote:

I agree. Sony is thinking more in the video than in the photography. They don't care about image quality anymore, it's better to have AF in video than the best IQ, even if no one that is serious about video is going to use it. The funniest thing is that they have the resources to make a limited niche market camera like the RX1, and not to make an A700 and A900 DSLR replacement.

That's quiet short through the corner (Dutch expression). There is more to this AF system than for video. The AF works continues during shooting still pictures. Instead of Canikons version, where AF needs to adjust after each picture taken.

-- hide signature --


What he meant is that the AF sensor still gets a feed during exposures, contrary to traditional DSLR AF systems (such as still used by Canon and Nikon) which lose their AF signal during exposure.

For example during a rapid 10 fps burst that means there's no AF signal for about 60 to 80% of the time (based on 60 to 80ms top class blackout times from Nikon and Canon). Which in turn means that the SLT AF system is less dependant on predictive algorithms with their inherent error margins.

It is even more surprising that despite the theoretical advantage of the SLT system, the Canikon lens/body combos seem to track better than the Sony equivalents. The thing is, in theory ´╗┐the Sony system works better, but Canikon have worked for so long around this handicap, with predictable AF and much, much more field experience, that their higher end bodies still outperform Sony's SLT bodies by a margin.


And I would disagree with that assumption. But, as pointed out earlier, DSLRs need better predictive algorithm due to delay between activation of AF module and eliminating that gap is an underlying idea with DSLTs, besides addressing the issue of mirror slap itself.

That isn't just a theory. ALL SLTs hold their own in AF performance in their class. In fact, if I had to choose between A580 and A55, for every possible scenario, I would pick A55, again.

Go ahead and name a camera in that class you would rather have for AF speed over A55.

AF speed depends heavily on the lens, not only on the camera.

As for cameras with equal or better tracking abilities, I do not know in the A55 class, but I do know that both the Canon 7D and the D300 do have a better tracking system than does my A77. I have tried them all out, although to be fair I use a screw-driven lens on my camera, which is certainly not the best for tracking and AF precision.


 quatpat's gear list:quatpat's gear list
Sony SLT-A77 Tamron AF 28-75mm F/2.8 XR Di LD Aspherical (IF) Tamron SP AF 200-500mm F/5-6.3 Di LD (IF) Sony DT 50mm F1.8 SAM +2 more
Post (hide subjects) Posted by
Keyboard shortcuts:
FForum PPrevious NNext WNext unread UUpvote SSubscribe RReply QQuote BBookmark MMy threads
Color scheme? Blue / Yellow