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Sharpness - Bokeh
with the One Dollar Resolution Chart (RX100 IV vs 5N)
Foto tutorial (English)
Foto tutorial (Espaņol)
Equipment recommendations US-ES
Flaat for Canon
Flaat for Nikon
Flaat for the BMC
Flaat for NEX-5N
Old Picture Style Tests
550D video lineskip
APS-C vs Full Frame
Badly assembled lenses and image quality
Lens mount compatibility chart
ISO on different cameras
High ISO on the 5D3
DIY: DR test chart
RGBWK Bayer sensors
Notes on DoF-FoV
Notes on crop-DoF-FoV
Custom Cropmarks for Magic Lantern on the Canon 550D
How many megapixels do I want?
How many megapixels can I see?
Quick Monitor Calibration Chart
I sold my a7S and bought an RX100 IV. It's a lovely little camera that shoots very nice video: good dynamic range, super sharp 4K, high fps. But how good is it for stills? Can it compare with my NEX-5N with SpeedBooster?
The RX100 uses a relatively small sensor (1" instead of APS-C) and has a zoom lens (I prefer primes over zooms), but being a fixed lens it can be tailored to the sensor and might be a good performer, and the sensor is much more modern and has more megapixels. Also, a small sensor is bad for noise, DR and sharpness-with-the-same-lens, but it does make it easier to design a good lens, particularly a complex one such as a fast zoom.
The lenses I have tested on the NEX-5N are the following:
* Leitz Elmarit-R 24mm f/2.8 (1978) (Leica R)
* Leitz Elmarit-R 35mm f/2.8 (1978) (Leica R)
* Leitz Summilux-R 50mm f/1.4 (1976) (Leica R)
* Leitz Elmarit-R 90mm f/2.8 (1966) (Leica R)
All of them using a first-generation Metabones Speedbooster (Leica-R to E-mount).
The results are very interesting. The RX100 IV is actually a lot sharper in the center, and not a lot worse in the corners. At 24mm (my most used focal length, together with 70-90mm), it's actually sharper all across the frame! (Because my vintage 24mm is not stellar but hey, that's a big feat anyway)
Also: f/3.5 seems to be the sweetspot for the RX100 IV, and at that aperture it can compete with the bigger sensor with speedbooster at every focal length.
Also, bokeh tests, at 70mm f/2.8 f/4.0 and f/5.6
(Just for fun, because with such a small sensor and a zoom lens the camera is basically deep-focus-only)