35 votes
Accepted

So my iPhone 6 camera lens is as wide as my full frame 35mm DSLR lens?

You're right that the angle of view of the iPhone camera is a little bit wider than a 35mm lens on a full-frame film camera. Up until this point, you're not really confused. But the part after that, ...
  • 142k
16 votes
Accepted

As a blind person, how can I better understand how wide or narrow a field of view is?

When a field of view is described as 120°, that refers to the total angle. So, 60° to the left of center and 60° to the right. Most camera lenses show a very restricted subset of the field of view ...
  • 142k
14 votes
Accepted

Does aperture affect field of view?

Answer with an image : the guy on the left represents your (vertical) field of view and its image on the sensor is inverted on the right (in other terms, the guy fills your entire image). As you can ...
  • 4,123
13 votes

Shouldn't the diameter of the moon with a 600mm lens be double what it is with a 300mm lens?

Assuming both lenses are being used on the same size sensor, the area in the frame with a 600mm lens should be one quarter the area in the frame with a 300mm lens. The linear dimensions should change ...
  • 171k
12 votes

What focal length do I need to get the same field of view as an iPhone SE?

According to this the iPhone SE has an 29mm-equivalent lens, so on a Fuji with a 23.6x15.6 sensor (Fuji XT-3)(crop factor 1.53) you need a 29/1.53=19mm lens for the same field of view.
  • 18k
11 votes
Accepted

Is it exactly true that doubling the focal length makes everything look twice as big?

Your intuition is right. To validate it, we can dig into basic high-school geometry. Although a camera lens is actually a complex lens made from many elements, conceptually and mathematically for ...
  • 142k
11 votes
Accepted

does focal length change across an image?

There's really no such thing as a 'theoretically perfect' rectilinear lens with a perfectly flat field of focus and no geometric distortion. Even a lens that perfectly matches its blueprint would not ...
  • 171k
10 votes
Accepted

Why does Sony say that a 35mm lens is "35mm equivalent when used with an APS-C camera?"

The confusion here comes in entirely because "35mm" is the common name for the 135 film format, also known as "full frame" — and it happens to be the focal length of the lens you are looking at. The ...
  • 142k
9 votes
Accepted

Why do photographed objects in the distance appear smaller than they do by naked eye?

The only way to simulate with a camera and lens what our brain does when we look at distant objects is to use a much longer focal length. This, of course, also reduces the field of view in a dramatic ...
  • 171k
7 votes

What is the focal length on your typical cell phone camera?

Focal length does not change with sensor sizes - what actually changes is the field of view: FOV [°] = 2 * arctan ( d [mm] / (2 * f [mm]) ) FOV is our field of view in degrees, d is one of the ...
  • 6,437
7 votes

Is a 30mm lens a good general purpose lens on an APS-C sensor?

A “normal” lens is one that is not telephoto and not wide-angle. This works out be a lens with a focal length about equal to the diagonal measure of the format frame. The Advanced Photo System (APS) ...
  • 37.2k
7 votes
Accepted

Why is the field of view angle from exiftool different from Apple's official values?

In the linked tables, FOV refers to horizontal field of view, according to the key. The discrepancy would be due to the fact that the values calculated by exiftool refer to diagonal angle of view. As ...
6 votes
Accepted

What type of lens is more suitable for this type of portrait shot on railroad tracks?

I think you'll be best off with the 24-70mm zoom. You're going to want a smaller aperture than f/1.8 anyway -- at 10 feet, the 85mm set to f/1.8 will give you only a few inches of depth of field. Your ...
  • 31.4k
6 votes

Why is the field of view of my lens narrower than my calculations show it should be?

Here are some possible sources of error: Manufacturer stated focal lengths are often rounded favorably or sometimes plain exaggerated (e.g. a 200mm might well be only 190mm). Focal lengths are also ...
  • 118k
6 votes
Accepted

How do I find the focal length when stitching images made with an unknown lens in Hugin?

No, you need to enter either the field of view (FOV), or the lens and crop factor information. Luckily for you, for the Apollo mission images, the camera and lens information is well documented. The ...
  • 31.5k
6 votes

Buying a Nikon DSLR Camera body only, is a 35mm and 55-200mm lens enough for most cases?

35mm is not wide enough for many types of general photography. With any group shots, (especially indoors) or any large outdor landscape scenes, you will need something like 16mm to 18mm to get ...
  • 11.7k
6 votes

Can I optically zoom in but still capture the content seen when zoomed out?

No. Zooming in works by moving the optics of the lens so that the focal length is longer, resulting in a reduced field of view and greater magnification actually projected on to the sensor. This isn't ...
  • 142k
6 votes

Is it exactly true that doubling the focal length makes everything look twice as big?

It's not exactly true, but it's a first approximation and easily good enough for many practical purposes. Let's consider an ideal thin lens. We're already introducing one level of errors, because ...
  • 1,487
6 votes

Distortion towards the edges/corners of the field of view in an image

This is perspective distortion, and it is an inevitable outcome of projecting a three-d world onto a flat surface. See What is the difference between perspective distortion and barrel or pincushion ...
  • 142k
5 votes

Which sensor "full frame" vs. APS-C (1.6 crop) gives more distortion?

I think this is an "apples and oranges" comparison - of you use the same lens on a full frame and a crop camera, you get different fields of view, so it's not really meaningful to compare which has ...
  • 20.2k
5 votes
Accepted

Why do photographs make a place look bigger than it is?

Short answer: Lenses and field of view. Long answer: Your eyes work very much like a camera, with field of view for binocular vision at about 115 degrees. According to this site, the true central ...
  • 492
5 votes

Buying a Nikon DSLR Camera body only, is a 35mm and 55-200mm lens enough for most cases?

It depends. This is why getting a blanket lens recommendation almost never works. Everybody has a different set of priorities on what and how they want to shoot and how much they have to spend. ...
  • 50.2k
5 votes
Accepted

Is a 30mm lens a good general purpose lens on an APS-C sensor?

IMHO, 30mm would be ok for general purpose photography. I have a sigma 18-35 and I often find myself using the long end of this lens (from 28 and onwards). Distortion depends a lot on the specific ...
  • 168
5 votes
Accepted

Camera handling - right handed, left eye dominant

Do what is most comfortable to you. I am also right handed and for whatever reason got used to using my left eye to look thru the view finder. Personally, I find having both eyes open quite ...
  • 17.2k
5 votes
Accepted

How big is the sun in an image made with Canon APS-C and 300mm focal length?

As Alan Marcus mentions, the sun (as well as the moon) are very close to the same size in the sky, at 0.5° of arc. The angle of view 𝜃 of a lens with focal length ƒ, as seen by a camera with sensor ...
  • 31.5k
5 votes

Why are lenses characterized by focal length and not the effective field of view?

This question is predicated on a misconception. The flange distance is included in the focal length in lens labels — it is the distance from the optical center of the lens focused at infinity to the ...
  • 142k
5 votes
Accepted

Does a Canon 18-135mm have a wider field of view than a Canon 24mm?

If using it on the same camera yes. As long as the sensor size remains fixed the angle of view is determined by the focal length. And 18 is lower than 24 so it is wider.
  • 1,561
4 votes

So my iPhone 6 camera lens is as wide as my full frame 35mm DSLR lens?

More simply, what you are missing is that the lens on the iPhone is much MUCH wider than the lens on your DSLR. You have a 35mm lens on the DSLR, but you have a 4mm lens on the iPhone. The iPhone's ...
  • 34.6k
4 votes

Does the crop factor affect the field of view (FOV)?

You should use the actual focal length of the lens in question. When you include the sensor size into the equation FOV = 2 arctan(SensorSize/2f), you have already included the crop factor into your ...
  • 171k
4 votes

Why does Sony say that a 35mm lens is "35mm equivalent when used with an APS-C camera?"

What's causing confusion here is that "35mm" in the spec refers to the format (more commonly known as "full-frame"). So the part of the lens spec that states: 35mm equivalent ...
  • 118k

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