Audii-Dudii
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 p.78 #5 · Pre-order: Fujifilm GFX 50S Medium Format body ($6,499) | |
Steve Spencer wrote:
In most of those situation you can use one stop higher ISO and have fairly similar results or use a one stop less ND filter if you are using one and get the same results.
For many, that will be true, but not for me, unfortunately. Where I live, for a large part of the year, it's a struggle to achieve decent IQ even at base ISO due to the ambient temperature (during the summer months, it can still be over 100 degrees at midnight, which wreaks considerable havoc on almost every digital camera's noise signature).
Plus, because I photograph mostly urban scenes, longer long-exposures provide many more opportunities for undesired elements -- cars, trains, airplanes, people with cell phones, et al -- to enter the frame during the exposure, forcing me to start over.
From the latter perspective, m4/3 is the best format for this type of photography (because I can achieve adequate DoF at f4 and shorten the length of my exposures accordingly) and medium-format the worst (because I often have to stop down to f11 to achieve adequate DoF without movements, which lengthens my exposures insufferably, sometimes out to as long as five or six minutes.)
From the former perspective, however, 35mm in the form of a Sony A7R (but not an A7RII, which is actually performs worse than an A7R for my purposes!) seems to be best compromise, at least as compared to previous generations of medium-format sensors. My P30+, for instance, cannot be used at anything but base ISO for an exposure longer than, say, 15 seconds, which occurs very rarely for my type of nighttime photography.
No doubt the GFX sensor and processing pipeline is many magnitudes better at handling noise than my venerable P30+, but factor in the summer heat and its compact form-factor (which potentially makes it more difficult to dissipate its self-generated heat) and well, I'll definitely need to try it before I buy it. <shrugs>
(Like you, I am very much an outlier in the way I use my cameras, because I similarly don't own a single native lens for any of my Sony or Fuji bodies.)
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I think the D810 still has the most DR if I recall correctly so it really depends on what set of features is most important to you 