The Crucial Catch with Your Camera's Super-High ISO Range
Native vs. extended ISO explained, fixing Godox flash misfires, and where to get true silver halide B&W prints.
If you’ve ever looked at a new camera’s spec sheet, you’ve probably noticed the marketing department boasting about massive, six-digit ISO capabilities. Numbers like ISO 204,800 or even ISO 3,280,000.
But there’s usually a catch hidden in the fine print: the distinction between “Native” ISO and “Extended” ISO.
What’s the actual difference? It basically comes down to hardware versus software.
The native range is what the sensor is physically engineered for. That’s where you get the best dynamic range, the cleanest files, and the most accurate color. You generally want to stick to this range for most shooting.
The extended range pushes beyond the hardware limits using digital amplification — essentially, software pretending to be hardware. Those “Lo” and “Hi” settings at the extreme ends of your dial — are essentially an in-camera software trick. When you shoot at an extended low setting like ISO 50, the camera is actually just taking a photo at its base native ISO (usually ISO 100) and digitally darkening it by a stop before saving the file. It is doing the exact same thing as dragging the exposure slider to the left in Lightroom.
The problem is that because it’s a digital pull, you are instantly sacrificing dynamic range, making it much easier to permanently clip your highlights.
A bit like a stereo. You can turn up the volume to a certain point and it still sounds clean. Push it past what the speakers can physically handle, and everything starts distorting. You’ve gotten louder, but it comes with a real cost to sound quality.
In practical terms, stepping into extended ISO means noticeably more noise and grain, crushed shadows and blown highlights, and colors that start looking washed out. The drop-off isn’t always gradual — image quality can fall off a cliff the moment you cross that line.
So why use it at all? Sometimes it’s the only option. A great example is this Blue Planet II footage of mobular rays feeding at night — shot entirely on faint bioluminescence, grainy as anything, technically poor. But it captured behavior happening in total darkness that simply wasn’t possible to photograph any other way. That’s what extended ISO is built for — for when it’s a last resort but you just need to get the shot.
Think of it as a reserve fuel tank. Not for everyday use — but genuinely useful to have when the lights go out.
I have a more detailed breakdown — including what’s actually happening inside the sensor, and how AI noise reduction tools have changed the calculus — on the site.
Updates
Here’s what I’ve been working on this week:
I posted my hands-on review of Viltrox’s wide-angle conversion lens for the Fujifilm X100VI. It takes the camera’s fixed 35mm perspective and converts it to a 28mm. Both are traditional street photography perspectives, but I prefer the slightly wider view. And the Viltrox conversion lens does a great job: sharp, clear, and less than half the price of the Fujifilm-branded equivalent.
If you’re shooting with Godox flashes, you’ll have found that while they’re great flashes, they can be a bit rough around the edges in terms of user experience. If you’ve ever been stumped why your remote trigger won’t fire your off-camera flash, here’s the most likely culprit.
I’m working on a series of posts on the Fujifilm GFX100RF medium-format fixed lens camera. They should go live in the coming week.
Wide-Angle
Old-school black-and-white prints. If you’re shooting black and white, you’ve probably found that getting them printed at most labs results in just OK quality. There might be a slight blue color cast, and the rich depth just isn’t there. That’s because most print labs print black and white photos on color paper, and the results usually aren’t great. But there’s a handful of labs that still print traditional silver halide prints on real Ilford black-and-white paper. I’ve gotten great results from The Darkroom and Fromex. If you’re in the UK, you can print directly through the official Ilford lab (now known as Harman Lab; in the US, their orders are sent to The Darkroom for printing). I’ve also been very impressed by the end results of black and white from Whitewall, even though they’re not using traditional silver halide paper.
New Nik Collection 9. DxO’s latest update brings some massive workflow improvements, most notably AI-powered Depth Masks and one-click subject masking to speed up local adjustments. They’ve also overhauled the color grading tool into a single unified wheel and introduced 18 blending modes, alongside new analog-style effects like halation and chromatic shift.
Great deals on OM System cameras. B&H has some great deals on the OM System cameras. The original Olympus OM-1 (as in, the film version) was my first SLR, and I still have fond memories of shooting with it. When I shot with the digital Olympus OM-1 (it was the last camera with the Olympus branding before they switched completely to OM System), I was very impressed indeed. The lineup has been fleshed out with several other cameras. They’re Micro Four Thirds, rugged, eminently packable, and have high image quality. It’s a combination that makes them favorites for travel photographers and macro shooters. Definitely worth checking out if you’re after a high-quality, high-versatility option that’s smaller and more manageable.
Photographers at Work
Capturing India. Renowned Indian photojournalist Raghu Rai has died. The NY Times has a smattering of his stunning photos.
