Steve Spencer Offline Upload & Sell: On
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Ok, you are asking for a lot and I think you know that means you will have to make tradeoffs. So let me start by posing some questions and pointing you in different directions based on which way you would answer those questions.
First, do you want AF or could you be happy with MF? All other things being equal MF lenses are smaller because they don't have AF motors. If you want AF, there are still lots of options but it does present some clear limits. If you could be happy with MF, then you will have more options and in particular a Sony with a great FF sensor will be more possible.
Second, when you say speed do you want fast lenses for the shallow DOF they can create or do you mostly care about fast shutter speeds? If you want to have shallow DOF possibilities, then that will pull strongly toward FF cameras. If that isn't so important than to get small size then an APS-C solution or a m4/3rds solution may well be easier.
Third, high ISO capabilities is going to be generally related to sensor size. How important is having good high ISO versus having small lenses? If the best high ISO is more important than the smallest size then you will probably be better lean toward a FF camera, whereas if small size trumps high ISO capabilities you will probably lean toward a smaller sensor.
One general way to describe things right now is that a FF mirror less camera (such as the Sony A7 series) will get you a smaller package than you Nikon DSLR kit, and it will have tremendous high ISO and IQ, but it will be bigger than systems with a smaller sensor.
Micro 4/3rds in contrast will get you the smallest kit with still great IQ, not quite as good high ISO, but still an excellent system.
Fuji and Samsung will get you something in the middle. Not quite as small as m4/3rds and not quite as good high ISO as Sony, but a balance of size with high IS0.
With those questions and tradeoffs in mind let me propose 6 setups (one MF and one AF or each of the sensor sizes.
1) Full Frame and MF: Camera - Sony A7r (with Kolari vision mod to optimize the use of Leica M mount lenses) This is a 36mp sensor (pretty much the same one as the D800); Lenses: Leica M 21 f/3.4; Leica M 28mm f/2; Zeiss ZM 35 f/1.4; Leica M 50 f/1.4 ASPH (or if your pockets are deep enough and you want really fast the Leica 50mm f/0.95; it is bigger, of course but still fairly small for the aperture of the lens); Leica M 90mm f/2. You will still need a sports/aviation lens. That lens will be big, no getting around it. You best bet may will be the Canon FD 500mm f/4.5L, but it is pretty huge. But you may well want AF for this lens, then I would recommend the LAEA4 adapter and the Sony A mount 70-400 f/4-5.6. What you get here for a hefty price is small in size (but not ultra light because they are made of metal) but ultra high performing lenses with the Leica M lenses. This set up is quite costly but will do almost everything well. You will need a big lens for sports and aviation and it won't perform all that well on this camera. Ok, performance but other options will be better.
2) Full frame and AF: Camera Sony A7r II (will be out in a month or two you can order it now). This looks like a phenomenal camera with body base image stabilization, a brand new 42mp sensor, much improved AF, and other bells and whistles. I don't think it is an exaggeration to say the camera is probably better for high ISO and IQ than your Nikon 810, it should be at least a strong competitor. Lenses: Sony/Zeiss 16-35 f/4 for landscapes, Zeiss Batis 25mm f/2, Sony/Zeiss 35mm f/1.4 (for speed you could get the f/2.8 if you want tiny); Sony/Zeiss 55mm f/1.8, Zeiss Batis 85mm f/1.8; for sports and aviation Canon 400 f/5.6L with the metabones IV adaptor (it looks like this camera will work with Canon lenses and the mentioned adapter with decent AF (if you prefer a zoom you could go with the new Canon 100-400 f/4.5-5.6L II or the Sony A mount 70-400 f/4-5.6 mentioned above (with this camera the Sony lens should AF quite a bit better with the camera's AF and the simpler LAEA3 adapter.
This solution delivers top IQ, and top high ISO performance, (it exudes high speed and high IQ), but it isn't as small as the other options.
3) m4/3rds MF option: Camera Olympus Em-5 II (but smaller cameras are available if you want to go smaller); Lenses: Samyang 10mm f/2.8, SLR magic 12mm f/1.6, Voigtlander 17.5 f/0.95, Voigtlander 25mm f/0.95; Voigtlander 42.5 f/0.95, and for the sports and aviation lens it probably makes sense to go with an AF lens, right now the best bet looks to me like the Olympus OM 40-150 f/2.8 with a 1.4 extender if needed. This is a very high quality lens, but it is not all that small.
4) m4/3rds with AF option: Camera Olympus Em-5 II; Lenses: Olympus 7-14 f/2.8, Olympus 12mm f/2; Panny/Leica 15mm f/1.7; Panny Leica 25mm f/1.4: Panny/Leica 42.5 f/1.2, and for sports and aviation the same Olympus 40-150 f/2.8 zoom.
5) Fuji with MF option: Camera - Fuji XT1 (but smaller cameras such as the XE 2 are available); Lenses: Samyang 12mm f/2; Samyang 16mm f/2; Leica M 24mm f/1.4 ASPH; Zeiss ZM 35mm f/1.4; Leica M 75mm f/2 AA (or the 75 f/1.4 if you want to optimize speed); If you wanted to go with a sports/aviation MF option the Canon FD 300 f/4L would be a good choice, but if you wanted AF the Fuji 55-200 f/3.5-4.8 OIS is probably your best option for now.
6) Fuji with AF option: Camera - Fuji XT1; Lenses: Zeiss Touit 12mm f/2.8 or Fuji 14mm f/2.8 depending on focal length preference; Fuji 16mm f/1.4; Fuji 23mm f/1.4: Fuji 35mm f/1.4; Fuji 56mm f/1.2; Fuji 55-200 f/3.5-4.8 OIS is probably the best option for sports and aviation.
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