Random Orbits said:
Fatfaso said:
There are things I need to purchase first (house renovations), but as soon as I have the disposable cash, I'm going to buy a Sony A7RII, a Canon fd 50 1.2L and an fd 24 1.4L. The main reason I want this stuff is for casual "fun" shooting (which I need to do more often) and travel. Until native lens selections in the mirrorless world improve, as does AF, my Canon DSLR and EF lenses will remain my bread and butter moneymakers, but there is definitely an appeal to a low-weight high quality kit.
Now that Sony is starting to come out with faster FE glass, it'll be easier to compare whether or not a mirrorless kit will be lighter. The new Sony FE 35 f/1.4 is 4.5x3.1 in and weighs 22.3 oz. The 35L is 3.4x3.1 in and weighs 20.5 oz. The body may be smaller/lighter, but if the lenses end up being of comparable size, then it's appeal is reduced.
Well, there is no way around the optics. Anything from about 40mm upwards is going to be about the same size/weight whether mirrorless or with mirror. Both have to cover the FF sensor, and the flange distance dictates how you can design the lens. For wide angle/ ultra wide angle lenses (e.g. 20mm), you need to do retrofocus designs (which make the lens bigger again) because the lens is further away from the sensor (e.g. flange mount distance 42mm) than the focal length you want to have (e.g. 20mm). So, the mirrorless has an advantage in the (about) 20mm to 40mm range, because in theory it does not need a retrofocus design then. However, there is a big problem, if you have a fast lens (like f1.4) and you design it to sit very close to the sensor (e.g. 20mm) then the angle at the edges is so steep, it will not be detected at the edge of the frame. So, all your efforts are useless, since the lens won't work with the digital sensors (film would work). To some degree this can be overcome with curved sensors, or angled photo sites, I think Sony is working with such sensors.
But, overall the lenses on mirrorless have to moved somewhat away from the sensor to properly image. So, the only advantage you may have is some slow pancake lenses (20-40 mm range) on FF mirrorless, compared to dSLR.
The only way to go really smaller is to use smaller sensors, with all the drawbacks, see Nikon 24-2000mm (equiv.) all in one... ;-) But even with smaller sensors, a 400mm f5.6 lens is a 400mm f5.6 lens, it will be pretty much the same on all sensors, because the size is dictated by front element and focal length. And once the pixel density becomes limiting, the smaller sensor don't even give you much of an advantage anymore (apart from the smaller body).
If the FF sensor and the m3/4 sensor both are 20Mp, a 400mm lens will have a longer reach than the FF sensor.
But if you take a 50MP FF sensor, and a 16Mp m3/4 sensor, and put a 400mm lens on both, there is very little advantage of the smaller sensor, you simply can crop the FF image more.