Note: If your calculator is working in radians, you need the (180/π) part at the end. if your calculator is working in degrees, you do not need that bit! If you aren’t sure… it will become pretty obvious when you run the equation as results will be wildly wrong.

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Now, forgive the blindingly obvious statement here, but one problem is that to do, well, anything with the Ray-Ban Metas, you need to be wearing them. The whole point, ultimately, is that they're a camera on your face, allowing you to snap a pic of whatever you see even quicker than reaching for your phone.

Note that this equation HSize/2=f*Tan(FoV/2) is inaccurate if your DSLR lens has >1% distortion. So, it shouldn’t be used for lenses like the Canon 11mm-22mm and most <15mm EFL 35mm-format type lenses. The G6 14mm has ~5% distortion.

Sure, hardly anyone makes phone calls now, but the quality of the experience seriously impresses. On a test call to a friend, I could hear every word spoken to me, even outdoors with traffic passing by, and they could hear me perfectly. It was slightly surreal, speaking into the ether—and I got a few strange looks for talking to "myself" from passersby that likely wouldn't have even glanced if I'd had in-ear buds.

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GRATE meaning: a metal frame with bars across it that is used in a fireplace or to cover an opening.

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Even for those lucky enough to be blessed with 20/20 vision, you need to already be wearing them to benefit from that headline ability to shoot or record instantly—if you're not, it's going to take longer to get the glasses on, wait for them to pair, and then take a snap than it would just to grab your phone. Then consider that the Ray-Ban Metas presume you're not too precious about how well your pictures come out, given the framing issues.

Wrong. Not only have the Ray-Ban Metas already led to a college football spy scandal, but everyone I showed the glasses to during my review period had the same reaction: an immediate, almost visceral discomfort.

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Those factors combine for a puzzling return to questions of social etiquette when wearing smart glasses, and I'm not sure what the answers are. The only thing certain is that, in my experience, people really didn't like being around them.

If you want to use the field of view equation on this page to calculate the field of view for a sensor size other than the four that have been provided, you’ll need to refer to use this list of common sensor sizes and their crop factor.

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Image quality is solid from the 12-MP camera, and both color richness and detail captured impressed. However, everything always comes out slightly fish-eyed, and far more zoomed out than your own view of whatever you're shooting. This is fine if you want to take in as much of your surroundings as possible, but can prove to be disorienting when viewing photos back: Was I really standing that far away? No, the camera just makes it seem as if I was.

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While there's some dedicated integration with Spotify, the glasses pair with your phone as any other pair of Bluetooth headphones would, allowing you to use your preferred music service or podcast app. The directionality of the speakers means there's barely any audio bleed, too, which thankfully reduces that glasshole factor.

I need to shoot down on a square card table, 35 inches on each side (including margins) at a distance of about 1 meter. I am using a Panasonic G6 with the 14-42mm kit lens set at 14mm. Online calculators using the formula FOV (rectilinear) = 2 * arctan (frame size/(focal length * 2) indicate that the 14mm focal length should cover 35.14 inches in the vertical dimension at a distance of 41 inches. When I actually tried it, I had to be at least 11 feet back from the table. What gives?

Dan, I’m a newbie to landscapes, and I’m not a professional. So, here’s a little feedback. Please understand that I don’t necessarily have the right language to ask the right questions. What I was really looking for is a way to know what general lens size to use to get a “how large a field of view. The math is helpful, but really not intuitive, especially if your last experience with higher math was 30+ years ago. What was a very useful visual for demonstrating angle of view is the first illustration you had, namely, the “topdown” view of the camera with cones coming forward in different colors. A visual chart or series of charts showing an object at say 200 yards, with the focal point in the center, and a second overlay on top of that showing how much distance to the front & back of the focal point remains in focus relative to the aperture would be ideal. I realize you are probably laughing out loud at this, & don’t have anywhere near enough time for a project of that size, & probably even less inclination to actually do it, but it would be enormously helpful, and a lot more visually intuitive. Thanks so much.

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Half a world away, though, I'm testing out the new Ray-Ban Meta Smart Glasses in a gray and dismal UK. It is decidedly not sunglasses season, so walking around with a pair on my head in early November, the sun a distant memory, makes me feel (to use that most British of idioms) a bit of a pillock.

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On the sound front, the frames now feature five incredibly well-hidden mics that enhance the audio quality of your videos, and improved directional speakers that sit just in front of your ears, offering—Meta says—a 50 percent increase in volume and twice the bass of their predecessors.

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Factor in the semi-walled garden for sharing, especially when it comes to livestreaming, and the risk of being a glasshole and alienating your friends and peers, and it becomes increasingly tricky to imagine whom these are really for. Remember, Snap ended up with $40 million of unsold smart glasses.

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For listening to music or podcasts while walking around, the way those improved speakers pump sound right into your ears means the Ray-Bans can easily take the place of in-ear buds. Not only is this more comfortable, it has the benefit of leaving you with situational awareness, able to hear sounds around you.

Following in the footsteps of 2021's Ray-Ban Stories, the new model provides several notable upgrades to the hardware, making for a product that Meta now feels confident enough about to directly slap its name on. The integrated camera gets the biggest on-paper bump, leaping from 5 MP to 12 MP. That translates to an increase in photo resolution, up from 2592 x 1944 to 3024 x 4032. Video gets a similar increase, from 1184 x 1184 to 1376 x 1824, but remains at 30 fps.

If you hadn't already guessed from the brevity of the videos or the resolution dimensions (which amount to a 3:4 aspect ratio), these aren't so much smart glasses as they are social media glasses. Almost everything about the Ray-Ban Meta specs is centered on sharing to social platforms.

Improved comms features mean support for Wi-Fi 6 and Bluetooth 5.3 standards. Best of all for the snap-happy, onboard storage gets a whopping 8X upgrade, from 4 GB to 32 GB. Across the board improvements, then—but how are they to use?

Whatever combination you might opt for, though, the Ray-Ban Meta Smart Glasses are about the tech crammed inside the frames, with a suite of cameras, speakers, and communication tools aimed at letting wearers capture and share their lives with ease.

I would check that your camera is in full output. If you use are using a smaller output resolution, your FoV will be cropped. The frame size input will be smaller.

Taking a photo is as simple as tapping the button on the top of the right-side arm, while long-pressing starts video recording, with all media imported to the Meta View app to review. This can either be done manually through the app while wearing the frames, or else happens automatically when they're closed and charging in the case.

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Sadly, a superb audio experience isn't enough to make the Ray-Ban Metas an essential purchase (just ask Bose to explain why its sonically impressive audio frames got canned in 2022). Taken as a holistic product, they lack a clear purpose or identity, not convenient enough for unthinking point-and-shoot captures, nor comprehensive enough a recording tool for influencers.

Longer-term audio use is something of a battery drain, though, with the charge falling from full to about 15 percent over the course of a two-and-a-half hour walk about town. That's less than the proposed four hours per charge, and necessitated a return to the charging case.

As I continue to build out the photographic knowledge base on the site with articles like Understanding Neutral Density Filter Names and Numbers, and Understanding Aperture, I thought I’d write a quick post about how to calculate field of view for a photographic lens. Lenses are usually described by their focal length, expressed in mm, but how does this translate to field of view?

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Once you've imported media to your phone, you're presented with a raft of apps to which you can ping content. Unsurprisingly, Meta's own platforms are the default channels, with options to upload to Instagram, Facebook, WhatsApp, and Messenger (Threads, oddly, isn't one of those at launch).

Nikon specs their 10-24mm DX lens as having AoV of 109 degrees at 10 mm and 61 degrees at 24 mm when used on a DX camera. This does not agree with your table above. However, using their two numbers, you can easily calculate the sensor size from your formula–it is 28.4 mm. This is exactly the diagonal of the cropped sensor size of 23.5 x 15.7 mm.. Thus, Nikon uses the diagonal for quoting their specs, not the width of the sensor.

That's a problem that might only worsen as time goes by and Meta expands the integration of AI features into the glasses. Plans are in the works to be able to ask questions about your surroundings, or scan objects and ask for more details on it (an idea that could have use in retail, for instance), or even just to suggest caption ideas on your photos. Think of it as speaking with ChatGPT. Then imagine doing it in a public space, with people who are already creeped out by the camera functions. Those etiquette and privacy questions are only going to get tougher.

That said, you can seamlessly switch POV from your glasses to your phone and back again, which inventive creators are undoubtedly going to use to make some interesting videos. If you're brave, there's also the option to have comments read out to you in real time, via the glasses' speakers.

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If you read lens specifications (yes, I’m that kind of guy) on manufacturer’s websites, they’ll often quote the field of view (F.O.V) of a lens as well as the focal length. When they do this in photographic terms, they’re talking about horizontal field of view in degrees, and whilst any lens will also have both a vertical and a diagonal field of view, they are rarely talked about in relation to photographic lenses.

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Stylewise, they're better than you'd imagine. Apart from the camera rig and an LED that springs to life when filming—designed to signal to others around you that you're recording—embedded in the corners, at first glance they're almost indistinguishable from the classic Wayfarers.

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Thanks for the suggestion Kay. I like the idea, but there are many phone apps out there that offer this already, and they do a better job than I could ever do. I would suggest buying the app called “PhotoPills”, it has angle of view and depth of field calculators in it and it’s a great app for many things related to photography.

As glasses, they're surprisingly comfortable. The Wayfarer pair I've been testing—a "shiny black" model frame with dark green-tinged shades—felt slightly tight at first, but that was likely in contrast to my regular spectacles. Once accustomed to the different heft and grip—my usual glasses are 22 grams, while Meta's Wayfarers weigh in at 50 grams, but that's only 5 grams more than standard Wayfarers—they were cozy enough for longer periods of wear.

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So, while these Meta specs benefit from the classic Ray-Ban approach to style, making them glasses or shades you're more likely to want to wear for an aesthetic statement, as smart glasses they still feel more of a gimmick than a must-have.

Thanx for the math. Can the view angle and/ or field of view for fish-eye lenses both rectilinear and circular image types also be calculated? It is my understanding the formulas are more complicated. I am interested because I have two fisheye Zuiko lenses from OM-2 & 4 cameras which I would like to use with adapter on Panasonic G 85 or Canon M 50. Can you help? TIA

The equation with distortion is quite a bit more complicated, so even apps like PhotoPills haven't modelled it. It has 4 variable coefficients and an additional SIN function. Here is a calculator which extends to lenses with distortion: https://commonlands.com/pages/fov-calculator

The frame's right arm doubles as a touchpad for media controls. Sliding a finger forward or backward increases or lowers the volume, while a single tap plays or pauses. You can also answer and end calls with a double tap.

As far as I can tell, it is correct. I just plugged some values into other online FOV calculators and the FOV calculator in the most popular photography iPhone app and all got the same answers that are in my table. 36mm is the width of a full frame sensor.

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The larger the field of view, the wider the lens is and the more of a scene you are going to see with your camera. Telephoto and super telephoto lenses have very small fields of view, just a few degrees, so they aren’t able to see very much of the scene in front of them, although the compensating virtue is that what they do see, is much larger in the frame. A wide angle lens for landscape photography has a very small focal length, and therefore a large field of view that lets you record broad landscapes in a single shot.

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It must be noted here that Canon has actually used difference sensor sizes for their APS-C cameras over the years. Since the sensor dimension does affect the field of view, this should be taken into account in order to be 100% accurate. For the data table below I have chosen to use the sensor width of 22.5mm because this is the one that Canon seem to have stuck with for their own calculations, and it is also the dimension that gives exactly a 1.6x crop factor. Whilst they do have 22.3mm and 22.4mm sensor widths on the market as well, this minuscule difference would not actually make any noticeable difference to your images, but if you ran your own calculations for your own camera and found they did not match my numbers, this will be the cause of the difference. It was the source of some head scratching for me when I was figuring all this out myself!

The layout is designed to appear as though you have more options, though, with multiple sharing formats (story, reel, or post) for each app. Thankfully, it's not quite a walled garden—a generic share button lets you upload to other apps you have installed, such as sending a clip via Signal or posting an image to Bluesky.

You can also create montage clips from your photos and videos, mashing between four and 10 pics and vids into one shareable clip of up to 30 seconds. Editing is largely automated, with a few modes to select from—such as “Twist,” which adds a flip transition between each clip—plus the option to add one of 21 pregenerated music clips or size it in square or portrait orientation. If you do mix static images with video, a slow pan is added to the photos, so the whole montage flows without sudden stops.

So immediately rejected by wider society were they, that some establishments began preemptively banning Google Glasses from being worn on their premises. But that was in 2013. Everyone captures everything for the 'gram now, don't they? Or maybe TikTok. Whatever. We live in a world defined by the maxim “pics or it didn't happen.” Surely, here in 2023, wandering around wearing a pair of camera specs won't still faze people, right?

A pair of very discreet connectors under the bridge of the nose clips onto a bracket in the case, and they're back to full charge in just over an hour. The case itself is charged by a USB-C port (you'll need your own cable and plug, though) and is probably best left to charge overnight.

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Nov 27, 2023 — Thin-film optical filters are made by depositing alternating layers of materials onto a substrate, such as optical-grade glass.

Speaking of AI, remember that Instagram reel Zuck dropped to promote the Ray-Ban Meta glasses, asking Meta AI how to braid his daughter's hair? Well, forget about doing that if you're outside of the US. While some basic voice commands are available globally ("Meta, take a photo", “Meta, record video”), those hair-braiding instruction features and the like aren't active in all territories. Even in the US, they're in beta at time of writing.

As well as calculating the angle of view, we can also use the same trigonometry to calculate the field of view as a linear measurement, as long as you know the distance to your subject, or, if you know the size of your subject and the focal length you are going to use, it could tell you how far away from it you need to be to get it to fill the frame. The units of measurement will be constant in the equation, so if you use metres as your distance to subject, the linear field of view will also be in metres.

It's on the audio front that the Ray-Ban Meta glasses find their saving grace. Sound quality is surprisingly, almost shockingly, good—to the extent I had to double check if they used bone conduction. They don't, but the clarity nearly fooled me.

Whether it was my partner, friends I met for a meal, or even another regular I chat with at my local coffee haunt, when I explained what the glasses were and what they could do (often in response to “Why are you wearing sunglasses inside?”), their body language immediately changed, closing up and not wanting to look toward my eyes. Even when I reassured them that the Ray-Bans were only capturing when the LED was lit, they instinctively disliked the potential of surveillance.

your FOV table is wrong. i think you took 36mm width instead of the diagonal. =2*ARCTAN(SQRT(24^2+36^2)/(2*”focallength”))*(180/PI())

Of course, these new Ray-Bans aren't about blocking out harsh sunlight, although they're good at that anyway, rated to international safety standards for the US, UK, EU, and Australia. And they're not only available as sunglasses—Ray-Ban offers a choice of two frame styles, its classic Wayfarer and the new Headliner, in multiple colors and with lenses in opacities ranging from clear “regular” specs to transitions to dark shades. Prescription lenses are also available—and likely essential, as I'll get to—for an additional fee.

Since the equation for field of view contains the sensor width, which determines the crop factor of a sensor, this is another way to see the effect that the crop factor of a camera has on an image. The smaller the sensor, the larger the crop factor, and the smaller the field of view for a given focal length. Below I have included data for full frame field of view, as well as the three most common digital crop factors. If you want to learn more about crop factor, you can read my tutorial: How To Calculate a Camera’s Crop Factor.

Field of View. How many feet both horizontally and vertically in FOV using a 2000mm lens at 800 yards? I am trying to decide if I want to spend the money on a Nikon that comes with that lens.

Setup is simple enough, mostly done through the Meta View app. You pair the glasses by holding down a discreet button on the rear of the charging case, but a Meta account is required (existing Facebook or Instagram logins will work). The whole process, after some initial bumps, only took about five minutes. Incidentally, that charging case is another improvement on the Stories model, now an elegant tan leather, and capable of providing eight full charges for a combined 32-hour battery life.

Here are some use-case scenarios for when I would want to be already wearing a pair: A neighborhood cat is coming up for a scritch; a lion is walking the streets having escaped from the circus; or a rat is stealing a slice of pizza. In such cases I want—no, need—to take a photo instantly.

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Video seemed to fare better in terms of framing, but with the tradeoff of lower resolution. Still, visual quality was more than acceptable, especially for the truncated recording window of 60 seconds max. That sort of length is perfect for taking 360-degree tours of your surroundings: I got some nice pans and a few first-person vids of a local Christmas market. Transitioning from light to dark areas is handled with aplomb, too. But the big wins with video here are impressive stabilization and spatial audio recording from those five mics.

The LED itself isn't all that prominent, either—a gently pulsing white light that's easily overlooked, especially in broad daylight. It's not going to be a super clear indicator of recording, especially to anyone who doesn't know what the specs are. It's easily covered or obscured, too, with no impact on the actual recording.

If, like me, you already wear glasses, unless you spec prescription lenses (Meta and Ray-Ban were unable to prepare a prescription pair for this review, but you can choose from -6 to +4) every time you want to use them you'll have to actively swap them in place of your usual specs, destroying the immediacy of their intended use. Similarly, if your prescription Meta Ray-Bans are shades, but you go indoors, you'll either need a second clear pair or surrender to appearing like a cut-price Anna Wintour.

What's more likely to win some creators over is the ability to livestream directly from the Ray-Bans, a feature absent from the earlier Stories. You can broadcast for up to 30 minutes, but the catch is that this is a walled garden, only allowing you to link to Instagram or Facebook. Quality takes a further hit here, too, capped at a mere 720p.

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Still, the voice controls that are included work pretty well, and at least expand beyond just commanding the glasses to capture media. You can start a phone call, connect with people on WhatsApp, or dictate messages, all with a “Hey Meta …”, and with surprising accuracy, too. That five-mic array picks up audio clearly even when outdoors and walking down busy streets, or on windy days, and they always selected the contact I intended.

I’ll be honest Michael, I don’t have time to do the math for you. The idea was to create a resource for people to calculate this themselves. All the equations you need are right here on the page. Just plug your numbers in 🙂

However, while these Creations, as they’re called in-app, might find some use to document rapid-fire bursts of activity (especially for anyone wanting to make their life look more exciting than it is), users who like to really curate their #content won’t find enough precision in editing or customization here.

I am not at all sure which is the best way to quote, but it is important to know how the quoted numbers are defined. Thanks for your very useful discussion.

I also found framing an image to be a bit of a gamble. Anything I was looking at front-on would come out shifted to the left. To center an object, I'd have to turn my head to the left, almost looking past it. That then often resulted in overcorrection, and it regularly took multiple attempts to get the subject in shot as I wanted. When one of the selling points is meant to be the ability to instantly take a photo, that's not exactly ideal.

Remember the dawn of the glasshole? A decade ago, when Google first launched its Glass range of smart specs, they were met with a wave of condemnation from privacy campaigners, ethicists, and anyone who just didn't like the idea of strangers potentially recording them.

Launching a new generation of smart glasses in conjunction with one of the world's best-known sunglasses manufacturers right as the northern hemisphere heads into winter is the kind of thinking that could only come out of a Golden State company like Meta.