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Sony a6300 — pushing in post at higher ISOs, continuous shutter

March 18, 2016 JimK Leave a Comment

This is part of a long series of posts about the Sony a6300. The series starts here.

In the preceding post, I posted three series of images leaving the exposure the same, varying the ISO in full stop intervals, and pushing the images in post to make them have equal brightness. I used continuous shutter mode for those series, and demonstrated that the camera is not ISOless in continuous shutter mode.

Now I’m going to go one stop higher in ISO. I started at ISO 6400, close to, but below the point where the a6300 does low pass spatial filtering on its raw files, left the exposure the same, and made images at ISO 3200, 1600, 800, 400, and 200. Then, in Lightroom, I pushed the ISO 3200 image one stop, the ISO 1600 image two stops, and so on, until I got to the ISO 200 image, which got a five stop push.

Here’s the overall scene, as seen by the a6300 and a Zeiss Loxia 21/2.8, using Lightroom CC 2015.5 with default settings except for white balance:

S6301684-2

Now, we’ll give the shadows a +100 shadow move and crop to a part of the image with some dark areas, and make a set of 200% enlargements.

ISO 6400, no push
ISO 6400, no push
ISO 3200, one stop push
ISO 3200, one stop push

Not much change.

ISO 1600, two stop push
ISO 1600, two stop push

A little more noise.

ISO 800, three stop push
ISO 800, three stop push

A little more noise, but not much.

ISO 400, four stop push
ISO 400, four stop push

Noticeably more noise.

ISO 200, five stop push
ISO 200, five stop push

A lot more noise, since we just crossed the conversion gain change ISO.

 

 

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