I thought it might be useful to post some practical examples taken throughout the ISO range. It’s a scene I often use for ISO tests because of the smooth tones between highlights and dark shadow. Basically, it’s a good test of ISO image quality, particularly as you start getting into the higher ISOs (in addition to being a fun place to shoot around the equinox!).
The Sony a7R IV has an ISO range from 50 through 102400. Of that, the native ISO range is from 100 through 32000.
At either end are extended ISO ranges where software takes over beyond the native capabilities of the sensor. These extended ISO ranges are from ISO 50 to ISO 80 and from ISO 40000 to ISO 102400.
ISO Range Sample Images Taken with a Sony a7R IV
I haven’t applied any processing or corrections to any of these—they’re as shot and entirely untouched after they’ve come out of the camera. They were all taken with a Sony a7R IV with a Sony FE 24mm ƒ/1.4 GM prime lens at ƒ/2.8 (the shutter speed obviously varied somewhat).
You can click on each image for a full-size version. The versions displayed are from the JPG versions; these have the camera’s built-in processing applied. You can see that at work particularly in the high-ISO versions where the processing engine has worked some magic to compensate for the downsides of high-ISO images, such as image noise, shifting colors, and reduced dynamic range.
Those full-size versions give you a good idea of the camera’s performance, but it’s worth noting that the versions you see displayed on the page here are derivative versions that are generated for web display. They’re good copies, but they’re still copies. So, in the caption for each image, you can find download links for the direct-out-of-camera original RAW and JPG versions (I shot them with the RAW+JPG option). You can download and view the original images at full resolution if you want a closer look. Be warned, though, that a 60MP camera produces big files—the JPG versions here range from around 21MB to 52MB, and the RAW (.arw) versions are about 123MB each (I used the uncompressed RAW setting).
Compared to the a7R III
I’ve previous posted a similar series of images across the ISO range of the a7R III.
Where to Buy
The Sony a7R IV is available from B&H Photo in various configurations, including the body only or with lenses and other accessories. Sony has set the MSRP for the body at $3499.99.
- The camera’s model number is technically the Sony α7R IV (i.e., with an alpha character rather than an “a.” It’s sometimes spelled out as Sony Alpha α7R IV, and the product number is ILCE-7RM4. ↩