Overall, the Startech presenter is my current favourite and, oddly enough, it is volume control that I am most enthusiastic about. I like to play music before class while I circulate the room and later prefer to sit with students if watching videos. Discretely controlling volume from anywhere in the room gives control freak academics like me a little more control over the learning environment.

Field of view calculatorastrophotography

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An easy example is when shooting architecture or landscapes. For those, you often might want to be able to fit quite a wide perspective, or large angle of view, in the frame.

FOV to focal lengthcalculator

The University of Waterloo acknowledges that much of our work takes place on the traditional territory of the Neutral, Anishinaabeg, and Haudenosaunee peoples. Our main campus is situated on the Haldimand Tract, the land granted to the Six Nations that includes six miles on each side of the Grand River. Our active work toward reconciliation takes place across our campuses through research, learning, teaching, and community building, and is co-ordinated within the Office of Indigenous Relations.

Here’s a calculator for the angles of view from lenses on digital camera sensors, as well as angle of view charts for common focal lengths. And I’ve also included an explanation of why the diagonal angle of view matters more than you might think.

That’s because it’s the spec that lens manufacturers include in their spec sheets. So when you see that a lens has so-and-so degrees angle of view, it’s actually telling you it’s from one corner to the diagonally opposite corner. It’s not telling you the angle of view from side to side. In that respect, it’s a bit like the size spec that TV manufacturers use (i.e., a 55-inch TV is 55 inches from one corner to the diagonal corner, not from one side to the other side).

A larger angle of view corresponds to a wider lens, meaning you can fit more perspective within the frame. Conversely, a smaller angle of view gives you a narrow perspective, as you might get with a telephoto lens.

Camerafield of viewsimulator

The data here is calculated. For more specific data that applies to a particular model of lens, check the manufacturer’s spec sheets for that lens. Sometimes there might be, say, a half degree of variation, but in general, these rounded numbers should get you very close. I’ve compared them with a number of lens spec sheets and found the data here to be quite accurate.

It’s also a fixed reference point if you’re using the same or similar focal lengths but on different-sized sensors. For instance, a 20mm lens will give you a wider angle of view on a full-frame camera than on a Micro Four Thirds camera.

CCTVfield of view calculator

Yes, this angle-of-view calculator works for zoom and prime lenses. You can enter any single, specific focal length along the zoom range. For instance, for a 24-70mm zoom lens, you can enter 55mm to see the angle of view at that point in the zoom range.

The reason I’ve singled Canon out as a special case here is that Canon’s APS-C sensors are just a smidgeon smaller than most other APS-C sensors.

When you’re taking photos, the angles of view horizontally or laterally across the frame or vertically up and down the frame are probably the ones you’re most focused on. But it’s actually the diagonal measurement that comes up more often.

A laser presenter lives in my backpack, follows me to class, and helps with seamless integration of my presentation slides and a classroom learning experience. Although it may seem at first like the options for a presenter are endless, there are surprisingly few good presenters to choose from once a few criteria are applied. Hopefully this blog post, based on my experience with different presenters, will help offer some "pointers" for those looking to pick up a new model.

Olympus and Panasonic Lumix are the most prominent manufacturers using this sensor format. In practice, there can be very slight variations in the dimensions of the sensors from model to model.

Lensequivalentcalculator

When you see that a lens has so-and-so degrees angle of view, it’s actually telling you it’s from one corner to the diagonally opposite corner. It’s not telling you the angle of view from side to side.

The practical angle of view of a lens varies based on the camera’s sensor size, so I’ve included some of the most common sensor sizes.

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Lens field of view calculatorapp

Criteria. Because I do not stand behind the podium when I lecture, a laser pointer by itself is unhelpful. In addition, student feedback indicates that red lasers are difficult to see, especially for colour blind individuals. From the green laser presenter options, I have direct experience with three. All three shown below have an internally stored usb plugin that allows communication with a laptop and all three have similar intensity lasers that are not quite as powerful as you might want, but easier on the eyes than those crazy intense standalone green lasers.

This is a new presenter for me and the least expensive option. There is no display for battery strength, timer, or signal strength, but I don't want those anyway. It has an intuitive button layout and sleek design. It is ~5 g (~10%) lighter than the other two presenters - noticeable. Importantly, this presenter has volume controls on the side! Never seen this feature with any other green laser presenters. Although I am excited about this presenter, and it is my current favourite, there are some disadvantages. The tab and enter buttons are useless for a presenter. The case is an awkward box, the buttons click more audibly than the Logitech (although less than the Kensington), the laser button seems a bit wobbly, and the usb requires fingernails to extract it from the presenter. Most unusual, this presenter does not have an on/off switch; the instructions do not help. Through trial and error, it turns out that the presenter turns on when the usb is removed. I actually like this feature - unlikely to leave the presenter on accidentally. Both the Logitech and Kensington moels require that I remember to toggle the on/off switch after each lecture. My rating: 9/10 (remove the tab and enter buttons, quiet the button clicks even more, new case, firm up the laser button)

By having a reference point you can compare lenses in an apples-to-apples kind of way. That can be very handy when choosing the right lens for the job.

Lens field of view calculatoronline

This is backlit presenter, which means that the buttons light up so you know which is which. Given that I don't ever want to look down at my presenter mid lecture, this is irrelevant, and I assume will drain the batteries more quickly. Pressing on the buttons results in the most audible "clicks" of the three presenters, which will be picked up by the audience and lecture podcast. The usb houses a micro SD card so file storage is a convenient and unique feature of this presenter. The least useful (yet most unique) feature of this presenter is the joystick that protrudes from the middle and allows the presenter tool to be used as a mouse. Good luck with that. Even when in presentation mode (toggle switch on the side), you will frequently bump the joystick and accidentally advance or reverse the slides - super annoying. This was my first green laser presenter and I didn't use it long. My rating: 4/10.

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For 35mm film, that’s going to be functionally the same as using the full-frame option in the calculator above. I haven’t added other film sizes, but I might try to put together a separate calculator for that.

Hikvisionfield of view calculator

These charts offer an alternative way of visualizing the calculated data above. It might be useful if you’re approaching it from the other direction and trying to find a lens that has a particular visual coverage that you’re after.

This is for full-frame digital cameras with a sensor that measures 36mm x 24mm, which is the convention for a full-frame sensor. It also applies to SLR cameras using 35mm film.

All posts and reviews on this site are written by me. And I only review gear with which I have personal hands-on experience. By a photographer, for photographers. Proudly AI-free. More about me.

The same general principles apply for film, but instead of using the size of the sensor you’d use the size of the exposed film plane.

Although a little pricey, this is a solid workhorse. Zippered soft material case, intuitive button layout, quiet button clicks, and ergonomic shape. There is a digital screen that displays battery power, signal strength to usb base, and timer (buzzes you when your time is almost up). I never bother with these features so would be happier without a display. A drawback of this presenter is that the button labels wear off quickly. Although the controls are intuitive, it will be more difficult for a new user to figure out how to use your pointer without any labels on the buttons. Given that I play movies and music in class, one feature that I would love to see with this model is volume control. If you don't need volume control, and like timer functionality, this is the presenter for you. It has a solid high-quality feel to it. My rating: 8/10 (better button labels would help, as would volume control)

Knowing the angle of view gives you a baseline reference for how wide a perspective you can fit in the frame. In a practical sense, I find it useful for choosing which lens is right for the job.