ecka said:
That makes no sense. They could give you all the EF-S goodness, for the right price, but it wouldn't be even close to what FF tools can do. It's a business, not a lottery. Today there are lots of unreasonable APS-C worshipers and tomorrow they may evolve (I hope) to understand how wrong they were yesterday. I wouldn't bet on "crop is better than FF" BS. Why should Canon? Hundreds of millions of dollars would go down the toilet.
The only thing we have to fear is stupidity - mindless, crazy, capricious, epidemic, destructive, fatal stupidity.
You either don't have a clue what you're talking about, or worse, you do, and just want to start a FF/Crop fight.
There are times when a top APS-C camera is superior to all but the highest-end Full Frame cameras for a specific purpose. Here's an actual example where, if I had a 5Dmk4 and an 80D, the 80D would be a superior tool:
The eagle is far away. I can't get closer to get the shot, and the longest lens I have is 600mm. Taking it on a 5D4 would give me a wider field of view, and a little more megamixels -- 6720x4480 -- but a lot of those pixels cover blue sky and trees that I don't care about. With the 80D, I get 6000x4000 -- but those pixels are in a smaller region, the area where my subject is.
Therefore, with an 80D, I have more choices: either I can have a 3500 pixel tall bird, or, I can zoom out to go wider. With a 5D4, the red area will only be 4200x2800, giving me about 2300 pixels (height) worth of eagle. I can't get a higher magnification because I don't have a greater focal length lens. If I were Doctor Strange, I could just fly closer and get a portrait-oriented, 6700 pixel tall bird, but sadly I am not.
In order to get more megapixels of my subject with Full Frame, I would have to get a 5DSR, and go 50 megapixels. In that case, I would get 8688x5792 total pixels using the same 600mm lens, and 5430x3620 in the crop area -- making my eagle photo superior (in megapixels).
But to accomplish that, I don't just need to go Full Frame, I need to buy a body that's four times more expensive. And for that, I would only get 25% more pixels for the area I'm interested in.
The big plus to Full Frame comes with landscapes, architecture, interior photographs, and that sort of thing. I want a 6DMk2, but I'll never use it for taking bird photos (I assume it's not going to be a 50Mp camera). I will use it for all those places where I physically can't move further back to shoot wider, because the room is too small, there's a street behind me, I'll fall off a cliff, or whatever. In that case, using the widest lens that I own, I'll get a better shot, with less distortion and capture more of my larger subject.
They're both useful tools. For the foreseeable future, ILC manufacturers will offer most of their FF cameras at lower megapixels than the crop multiplier ratio of the best APSC cameras -- I suspect because both marketing reasons and cost constraints. This means that they'll both have their place in the current paradigm.
Putting that all aside, APS-C prices go much, much lower at the entry-level end, and lens prices are a lot cheaper, and weigh a lot less. This makes them useful both for learning, getting people into the hobby, and for less dedicated enthusiasts and vacationers, who have other constraints and are happy to shoot great photos and videos with a xxxD with a 17-135 nano.