Verdict first, because the question on everybody’s mind is whether this is worth the price. Yes, it is. It is genuinely a great light meter. Whether it is worth roughly £650 to you specifically depends on what you shoot and how seriously you take repeatable, accurate metering. For me, after six months of using it heavily on the black and white paper reversal project, the answer is yes. For most film shooters, the answer is “eventually.”
This is not a first-impressions review. Sekonic sent me one to test in late 2024, and I have used it as my primary meter ever since. So this is what I think after a proper period of living with it, including some genuinely demanding metering situations.
What it is
The Sekonic L858-D SpeedMaster is Sekonic’s flagship light meter. Combined incident and 1-degree spot meter in one unit, plus flash metering with multiple trigger modes, plus a few professional features (delta EV, flash duration analysis, cine modes) that are nice to have if you need them.
The thing that makes it unusual is the combination. I am willing to be corrected on this, but I believe the L858-D is the only currently-available light meter that combines incident metering with a true 1-degree spot in one unit. Other recent releases do incident plus reflected metering, but the reflected option is usually a wider angle (5 or 10 or 30 degrees), not the tight 1-degree spot. If you want both incident and 1-degree spot in the same body, this is the only game in town.
(Sekonic do have one more expensive meter on general sale, the C800 spectrometer, but that is aimed at cinematographers needing colour analysis of light sources. For stills photography, the L858-D is the top of their line.)
Why I got one
Sekonic got in touch and asked me to review one of their newer light meters. Rather than just doing a quick first-impressions piece, I proposed a collaboration: the black and white paper reversal project I was starting required very accurate, very repeatable light measurement, and an L858-D would be invaluable for that work. They agreed, sent me a meter, and I have been using it heavily ever since.
That context matters because paper reversal is genuinely one of the most metering-sensitive processes I have ever worked with. The paper has an effective ISO of 1 to 5 depending on developer combination. The latitude is narrow. The process is sensitive to UV in ways that conventional film is not. If your meter is off by half a stop, your print is half a stop off, and on a process this unforgiving that is often the difference between a usable image and a wasted sheet.
So this review is from the perspective of someone who actually relies on the meter, not someone who has been waving it around as a fashion accessory.
How I actually use it
A few notes on metering philosophy before the specifics. There is no single “best way” to meter. Incident versus reflected, spot versus broad, none of that is universally better. The right method depends on what you are shooting, the medium you are shooting on, the lighting, the latitude of the process, and the result you want. Anyone selling you a “this is how you meter” rule is selling you a partial truth.
Within that, here is how I use the L858-D across my actual shooting:
Incident metering for general work. The meter has a rotatable dome you can point at the light source. This is my default for landscapes and any scene with reasonably even lighting. Quick, accurate, gives me middle grey out of the box.
1-degree spot metering for faces, in paper reversal work. This is where the L858-D earns its money for me. I spot-meter the brightest part of the subject’s face and use that as the reference for exposure. The 1-degree angle is tight enough that I can isolate a single cheek or forehead from the surrounding hair, clothes, and background. With paper reversal, where the latitude is so narrow, knowing exactly where the highlight will land is essential.
Spot metering for landscape contrast control. Spot a highlight, spot a shadow, look at the difference in stops, decide if the scene will fit on the film or paper I am shooting and adjust accordingly.
Flash metering, in three modes. The L858-D will meter flash in passive triggered mode (you press the button, it waits for a flash, it tells you the f-stop), in cabled mode (you wire the flash to the meter and the meter triggers it), or via Pocket Wizard / Elinchrom radio triggers (I do not use these because my flash system is not on a common platform). I use the passive triggered mode most.
![PLACEHOLDER: the Sekonic L858-D being used for a spot meter reading on a subject’s face during a paper reversal shoot]
The features that have actually mattered
Most light meters do incident and reflected metering. The L858-D goes further. The features that have made the difference in actual use, for me:
Delta EV. This is the feature I did not expect to use much but ended up loving. After you take an initial reading, you can press the delta EV button and the meter will tell you the difference, in stops, between that reading and any subsequent reading. So I can spot-meter the brightest part of a face, hit delta EV, then spot-meter the shadow side of the same face, and the meter immediately tells me how many stops of difference there are between the two.
For paper reversal portraits, where I need to keep the contrast across a face under about a stop and a half (otherwise the highlights blow or the shadows block up), this is brilliant. I can move lights around, re-meter, and see in real time whether I have got the lighting ratio where I need it. This single feature has changed how I light portraits for paper reversal.
Flash duration analysis. Tell the meter to measure flash duration, pop the flash, and it gives you the actual flash duration in microseconds (or fractions of a second). This is useful if you are trying to understand how your flash behaves at different power settings (older capacitor-based flashes have much longer durations at full power than at lower power, often by an order of magnitude). For sports or fast-action flash work, knowing the actual flash duration matters because the flash duration is your effective shutter speed.
I have not used this much yet but it has answered some questions I had about my older Bowens heads.
Customisable hotkeys. Three buttons at the bottom of the meter can be programmed to your most-used functions. I have one set to switch instantly between incident and spot. Saves a lot of menu diving.
Memory function. Stores readings for later reference. I have not used this heavily, but if I were doing multi-light setups across multiple sessions I could see it being useful.
Calibration offset. You can dial in a calibration adjustment so the meter compensates for filters, particular processes, or whatever you need. This is going to be useful when I start a planned ROD4 reversal project, where I will need a custom calibration for the unusual paper sensitivity.
What is not great about it
Three honest complaints.
The size. This is the big one, both literally and figuratively. The L858-D is significantly bulkier than the Reveni Labs spot meter or the smaller Sekonic L-308 I used to carry. It does not pocket easily. Packing my camera bag, I have more than once thought “where the hell is this going to go?” and considered leaving it at home. I always pack it in the end, because I trust it, but it is a real consideration.
The bulk comes from the large light dome and the through-tube that gives you the 1-degree spot. Both of those features depend on physical scale to work, so you cannot really make the L858-D much smaller without losing what makes it good.
The technology age. There is a common complaint online that Sekonic have not advanced the technology much in recent years. The interface feels behind, the screen is not as crisp as a modern smartphone, the menu structure is from a slightly older era of product design.
I agree with this in spirit and disagree with it in practice. Yes, the UI is a bit dated. But measuring light is not a new problem, and the L858-D solves it accurately and reliably. There is no functionality I want that the meter does not have. Slightly clunky software is the price of professional-grade hardware that has been refined over many years to do exactly what it is designed to do.
The price. £650 is a lot of money for a light meter. It used to be closer to £800, so it has come down, but it is still a significant outlay. Whether it is justified depends entirely on what you do with it.
The honest UV caveat
A comment appeared on one of my paper reversal videos asking, essentially, “why do you keep screwing up paper reversal exposures when you have this expensive meter?”
Fair point. The honest answer is twofold.
First, user error. I am the operator, and I make mistakes. No meter solves operator error.
Second, and this is genuinely worth knowing: the L858-D does not measure UV. Neither does the more expensive C800 spectrometer. Paper reversal is dramatically more sensitive to UV than to visible light, in ways that vary with season, time of day, and atmospheric conditions. A meter reading that says “you need 7 seconds” might actually need to be 4 seconds in strong summer UV, or 12 seconds in winter UV with the same visible-light reading. The meter cannot account for this because it cannot see UV.
So the L858-D will get you closer than any other meter you can buy, but for paper reversal it is still part of a larger toolkit that includes experience, test sheets, and an understanding of what time of year you are shooting in. A great light meter does not solve every problem. It just solves a lot of them.
How it compares to the alternatives
The other meters I have used or own:
Reveni Labs spot meter. Excellent compact 1-degree spot meter, about £200, fits in your pocket. Does spot metering only. If you only need spot, this is what to buy.
Reveni Labs Lumo. Incident meter with reflected metering option (30 degrees, not 1 degree). About £200. Fits in your pocket.
If you combined the Reveni spot meter and the Lumo, you would have most of the functionality of the L858-D for £400 instead of £650. The trade-off is two devices instead of one, and a 30-degree reflected angle on the Lumo instead of the true 1-degree spot on the Sekonic. For most shooters, that combination would be plenty. For paper reversal portraiture where I really need the tight 1-degree spot, it would not.
Sekonic L-308. Their smaller meter. Pocketable. Incident plus reflected. Does not do flash duration analysis, does not do delta EV, does not do 1-degree spot. About a third of the price of the L858-D and a fine choice if you do not need the high-end features.
Gossen meters. Even more expensive than the Sekonic and used by some professionals, though I see them less often in the field than I see Sekonics. I have not used one in anger.
For the photographer who wants the highest-end stills meter and is willing to pay for it, the L858-D is the answer. It is the meter Matt at Reveni Labs uses in his lab to calibrate his own meters against. The industry treats it as the standard.
Who should buy one
If you are a working professional whose income depends on getting exposure right every time, this is the meter to own. The reliability, the versatility, and the trust it earns over time pay for themselves quickly.
If you are an enthusiast shooting demanding processes where metering errors cost you sheets or rolls you cannot easily replace, the L858-D will earn its keep. Paper reversal is exactly this category. Large format colour negative is another. Anywhere the cost-per-frame is high enough that one missed exposure stings, the meter helps.
If you are a casual film shooter on a budget, you do not need this. The Reveni Labs combination, or a cheaper Sekonic, or even sunny-16 plus a phone meter, will serve you well at a fraction of the cost. Save the money for film.
If you are at the in-between stage, where you are getting more serious about your work and you can feel the limits of your current meter, you are probably circling toward this purchase whether you know it or not. There is a moment in many photographers’ lives when the price becomes justifiable, and after that moment they wonder why they waited.
For me, that moment came when I started a process so unforgiving that I could not afford to be uncertain whether my meter was the problem. The L858-D removes that uncertainty. The cost of the meter is less than the cost of the paper and chemistry I would have wasted figuring out a less reliable meter.
I cannot pretend it is cheap. But I can confirm it is worth it, for the right kind of photographer at the right point in their work.
Big thanks to Sekonic for the collaboration. The conclusion would have been the same if I had bought it myself, which I would have eventually.