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The A-mount Alphas are not mirrorless. They have a semi-transparent, non-moving mirror that steals about 1/3 of a stop to send light to the AF sensor. It give
by reeses 13y ago
The A-mount Alphas are not mirrorless. They have a semi-transparent, non-moving mirror that steals about 1/3 of a stop to send light to the AF sensor. It gives most of the advantages of the DSLRs (phase-detect AF, but that's creeping into higher-photosite-density mirrorless cameras) while making live view and continuous AF much less complicated.
That's why Sony refers to them as "SLT" cameras and not SLR.
You'd be just as well served by comparing a $900 Nikon (D7[12]00?) or Canon DSLR to the D4. If you can't justify the difference between, let's say, a D600 and a D4, then it's moot anyway. I imagine the D4 compares quite favorably to the HST and Kepler on many axes as well. :-)
- pedrocr 13y agoRead my comment more closely. My point was that SLT is already a big step towards mirrorless and alpha will be completely mirrorless in the next refresh. This will give you possibilities that haven't before been possible. As for my example the D7100 you mention has the same 24MP sensor of the A77 and yet can only do 6fps. The point was that a 900$ camera could best a 6000$ one on dimensions that are very important to professional users like fps because of mirrorless technology. Mirrorless will give you some things only the very high-end could do before (or even the high-end couldn't do) at entry-level prices, that's textbook Innovators Dilemma.