I've got the 550D with decent glass. I'd like to upgrade the body. I use the camera for a wide range of topics - portraits, landscapes, sports, any anything else that comes around (all-purpose family camera and more). In particular, I desire better autofocusing accuracy, frames per second, and better low light / high iso performance. I shoot 8k shots a year, give or take.
I have many questions.
1. What does it mean to have a cross-point focus point at 2.8? Dose this indicate that it only performs as a cross-point at 2.8 or brighter? (was going to say bigger, but that can be taken both ways)
2. Canon's anti-aliasing filter - is there a consensus on the value of this? 5Dc users speak so fondly of the IQ from the 5Dc, attributed to the clarity resulting from a weak AA filter. Nikon's D800E went without one as well (and the 810?), producing enhanced clarity images. Is the AA filter as Canon employs it an IQ limiter?
2a. I've read that the AA filter intentionally blurs the image a hair to eliminate the Moire pattern problem - does this reduce the net effective resolution of the image, or is it worse than that? Is the AA filter needed for photos? Can it be deactivated?
3. High iso noise - ETTR helps a lot, but will I see a stop of difference with any Canon crop body?
As I look to upgrade, I find myself contemplating the 7DII, 70D, 6D, A7, and maybe even a Nikon.
7DII - maybe a 'battleship in a bathtub' for what I need, but video focusing and so many cross type focus points has caught my interest. Seems like the IQ was not a key upgrade based on initial reports.
70D - 19 cross type focus points would still be a serious step up for me, and the video focusing looks effective. Pentaprism system would be a nice upgrade, as I understand it provides a brighter viewfinder view. I've come across many reports of focusing problems with the 70D - is this real or imagined?
6D- Better high-iso performance, but maybe not the autofocus improvement I'm looking for, or am I wrong?
A7 - I don't like the idea of using an adapter, especially with an autofocus speed penalty, but it would allow me to keep my glass. And FF high iso performance
Nikon - do I dare?
Please provide your impressions and recommendations!