The AstrHori AH-M1 is a compact hot shoe reflective light meter. It is small, it is solidly built, it does what hot shoe meters do, and at its launch price it was a perfectly sensible buy.
It also has a feature genuinely unique to this category of product: you are encouraged to sand the paint off it. AstrHori manufacture it from powder-coated brass specifically so that you can distress it to expose the brass underneath, giving it a worn vintage look. There are instructions on their website for doing this deliberately. You buy a brand new meter and you take sandpaper to it.
That alone makes the AH-M1 worth discussing. The rest of the review is whether the meter itself is good enough to justify the novelty.
The short answer: yes, it is. The longer answer involves a 30-degree metering angle, a worrying lack of cold shoes on my favourite cameras, and a moment of mild horror when I took 220-grit to a brand new piece of kit.
There is now an updated version, the AH-XH2, which is functionally identical with slightly improved build quality and a different form factor. If you are choosing between them, see that review too.
What it is
The AH-M1 is a tiny reflective meter designed to sit in a camera’s hot shoe (or cold shoe). It is a reflective meter with a 30-degree angle of measurement, which I confirmed by reading the actual specs. The viewing angle is roughly equivalent to what a 60-70mm lens would see on 35mm, so reasonably narrow for a reflective meter (most fall in the 30-50 degree range).
Two controls and one button: a wheel for changing settings, a button for switching modes, that is the lot. Shutter priority or aperture priority, push the button to wake it, turn the wheel to set the value you want, read the matching value off the screen.
It runs on a battery I cannot remember the specific size of (a small button cell). It has an ISO setting accessible via the same wheel-and-button combination.
That is the whole meter. Simple, focused, fit for purpose.
The shoe problem
I had a small practical issue with this review which is worth mentioning, because if you are buying a hot shoe meter, you presumably have a hot shoe to put it in.
I do not. Or rather, the cameras I actually shoot most do not.
- Bronica S2A: no shoe of any kind. Not cold, not hot, nothing.
- Bronica ETRS (body alone): also no shoe.
- Rolleiflex SLX: has a hot shoe, but also has shutter-speed-priority auto exposure built in, which makes testing an external meter on it somewhat redundant.
- Konica Omega Rapid: has shoes coming out of its ears, but does not actually work.
My solution was to attach the speed grip to the ETRS. That speed grip has a cold shoe on the top, and with the meter mounted there, I had a workable test setup. If you are buying one of these meters, check your camera actually has somewhere to put it before you order.
The shoot at St Harold’s
I took the ETRS-plus-speed-grip-plus-AH-M1 combo down to St Harold’s church, which is becoming a firm favourite location for these tests. Loaded a roll of Kodak Gold 200. Low winter afternoon sun, the kind of mixed light that tests a meter properly.
The meter’s readings tracked sensible exposure pretty consistently. Pointed at the open sky, it gave me settings around f13 at 500. Pointed at the church (mid-tone subject), it gave me f8 at 500. Pointed at the bridge with the sun behind it, it got confused and overcompensated (more on that below). Pointed at a textured bush in even light, it gave me a reading that produced a properly exposed frame.
Working with it on the speed grip was easy. The meter sits right where my thumb naturally falls, so a quick poke of the button gives me a reading without having to reach for a separate handheld meter. That ergonomic convenience is a real advantage of camera-top meters generally, and the AH-M1 is no worse at it than any other.
![PLACEHOLDER: a Kodak Gold 200 frame from St Harold’s showing the kind of correctly-exposed result the AH-M1 produces in mixed afternoon light]
What it does well and what it does not
This is true of all wide-angle reflective meters, not just this one, but worth saying clearly.
What it does well: gives you a quick approximation for evenly-lit scenes, lets you meter from the camera position without taking your eye off the viewfinder, makes you fast in changing light conditions.
What it does not do well: anything with strong contrast in the frame. Backlit subjects. People in front of bright windows. Scenes where one bright element dominates the metering area. In all those cases, the meter averages everything in front of it and gives you a number that compromises across the scene rather than nailing your actual subject.
I had a specific failure case I shot over the holidays: a portrait of my grandfather in front of a bright window. The meter averaged the window light, gave me a reading appropriate for that, and produced a frame where Grandpa is correctly silhouetted as the meter dictated. His moment in the limelight, ruined. AstrHori probably owes him an apology.
This is not the meter’s fault. It is doing exactly what a 30-degree reflective meter does. You are responsible for understanding what the reading actually means and adjusting accordingly.
How to actually use it
The trick with any reflective meter is to treat the reading as a starting point rather than a final answer. A few practical techniques:
Walk up to your subject. If you have a person or object you want correctly exposed, get close enough that they fill the 30-degree metering circle, take the reading, then back off to your actual composition. The reading is now calibrated for your subject regardless of what is behind them.
Meter the mid-tone. If you cannot walk up, find something in the scene of average tonal value (grass, a path, a road surface, the side of a building) and meter that instead of pointing the meter at the whole scene.
Interpret what the meter is telling you. If you can see that one element in your frame is dominating the meter’s reading (a window behind your subject, a bright sky), you know what the reading is actually metering for. Adjust from there.
A reflective meter that you use thoughtfully will outperform a spot meter that you trust blindly. The AH-M1 just needs your brain in the loop.
The bonus feature, which is the sandpaper one
This is the bit nobody else does and it is genuinely brilliant.
The AH-M1 is built from powder-coated brass. AstrHori intentionally designed it so the paint wears off with use, exposing brass underneath, giving you a vintage-looking distressed meter that matches the look of older cameras. If you just use it normally for a few months, the wear happens naturally.
But if you want to speed up the process, AstrHori provide instructions on their website for deliberately sanding the meter to expose the brass faster. You take a brand new piece of kit and you literally sand the paint off it.
I would not have believed this if I had not done it myself.
I went to the garage, found some 220-grit sandpaper (probably worn down to closer to 300-grit through previous use), and very gingerly took one swipe across the top edge of the meter. The paint came off. The brass came through. It looked properly nice. So I did another edge. Then another.
There is a moment of real psychological resistance the first time you put sandpaper on a new product. Everything in your training as a careful owner of expensive kit screams at you to stop. But the meter was designed for this. It is the feature.
After about thirty seconds of sanding, the meter has a worn vintage look that no other meter on the market replicates. It now looks like it belongs on an old camera rather than next to one. The styling matches my Konica Omega Rapid much better than the original glossy black did.
![PLACEHOLDER: the meter before and after sanding, showing the brass coming through on the edges and corners]
The verdict
The AH-M1 is a solidly built, sensibly priced reflective hot shoe meter that produces accurate readings within the limits of what a 30-degree reflective meter can do. The sandpaper finish trick is a genuine differentiator that nothing else on the market offers, and it is properly executed (it actually looks good, the brass is real, the process works).
It is a good buy if:
- You have a camera with a cold or hot shoe
- You want a quick reference meter that gets you in the ballpark
- You appreciate the worn vintage aesthetic and would actually use the sandpaper feature
- You understand the limits of reflective metering
It is not a good buy if:
- You need spot metering for high-contrast scenes
- You want a meter that handles backlight automatically
- Your cameras have no cold or hot shoes (check yours before ordering)
- You hate the idea of distressing a new piece of kit on purpose
The AH-M1 has since been succeeded by the AH-XH2, which uses the same internals in a slightly different and improved form factor. Functionally identical, build quality slightly better. If you can choose between the two, the XH2 is probably the marginally better choice today. If you specifically want the sandable distressed-brass look, the AH-M1 still does that and the XH2 does not.
Big thanks to PerGear and AstrHori for sending the meter. PerGear are the distributor for AstrHori in the UK and elsewhere, and their site is worth a browse if you are after Chinese-made photography kit at reasonable prices.
PerGear’s full link is in the video description, as is the AstrHori product page and a discount code.
One last thing about the name
For the record, I have spent more time than is reasonable trying to work out how to pronounce “AstrHori.” I emailed PerGear. They told me to say it the way it looks, which was not helpful. The s-r-h combination in the middle of an English word does not exist anywhere else that I can find. My working pronunciation is “Astra-Hori,” with a small beat after Astra and the H mostly silent.
If you can do better, please tell me in the YouTube comments. I am still in two minds.