18 votes

How does crop factor affect perspective?

When I started photography, this one took me ages to figure out, because people tend to explain it with a lot of math, or in a way that makes sense once you already grasp the principle but not before. ...
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  • 20k
13 votes

I am getting a complete vignetting on my new canon 6D but only with the 18-270mm lens

From the "Recommended For" tab of the Tamron web page for that lens: Tamron Di-II lenses are engineered expressly for digital SLR cameras with image sensors commonly referred to as APS-C, measuring ...
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  • 1,123
13 votes

Confused about T-stop number. Does it account for crop factor?

Crop factor has nothing to do with T-stop. T-stop is strictly about light transmission which affects exposure. If a lens could be 100% transmissive the T-stop and f-number of the lens would be the ...
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  • 168k
11 votes
Accepted

Can I use a 127.5mm focal length on a crop camera to see what the view would be like using an 85mm full frame lens?

No. You should set your zoom to 85mm to see what an 85mm lens looks like on your camera. The focal length of a lens is a physical property that does not change no matter what size sensor you put ...
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  • 49.2k
10 votes

Lens upgrade paths (sub $1000) for the EF-S 18-55mm IS kit lens for Canon APS-C cameras

Here are a couple of different common paths you could go that are sub-$1000. But as everyone is telling you, usage is the easiest way to narrow down your choices to something you actually need, ...
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  • 49.2k
9 votes
Accepted

Does a full frame lens require more light on a crop body?

The amount of light passed through the lens stays the same, the lens will still be a F/2.8 lens. Since the smaller sensor only crops out a different area from the illuminated circle, the exposure ...
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  • 1,030
9 votes
Accepted

Where does the light go when a lens with a larger image circle is projected on a smaller sensor?

In general cameras do use darker materials to construct light boxes and the interior surfaces of lenses. Many also use materials, such as the flocking material found on the inner surface of higher end ...
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  • 168k
8 votes

Does a full frame lens require more light on a crop body?

The same light will pass through the lens regardless of the type of camera to which it is attached. Less of that total amount of light will land on the smaller sensor. But exposure, when discussed in ...
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  • 168k
8 votes
Accepted

How to achieve full-frame look/view on a crop-sensor - without changing the lens?

You can't. What we refer to as equivalence is only an approximation. You can't put a different lens on a crop sensor camera and get the same shot with the same field of view from the same shooting ...
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  • 168k
8 votes

Where does the light go when a lens with a larger image circle is projected on a smaller sensor?

Lens produces circular image (image circle), which projected on rectangular matrix. So question is not only about full frame lens on a crop sensor. AFAIK black box (mirror box) is specifically ...
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7 votes
Accepted

Is there a way to use an extender on a Canon EF-S lens?

The Canon extenders will not physically mount to an EF-S lens. Even if you defeat the keying the front part of the EF 2X (any of the three successive versions) would extend into the rear of the EF-S ...
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  • 168k
7 votes
Accepted

Why does crop factor apply with APS-C lenses, and why aren't these brighter than FF ones at same aperture?

Your logic is sound. If your assumptions were right, then your conclusion would be right. Let me turn one of your questions around. You ask: Why does crop factor apply with APS-C-lenses, while it ...
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  • 140k
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 ...
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  • 6,307
7 votes

Focal length on Full frames and cropped sensors

If you take a photo of a FF camera and 75mm DX lens and compare that image with another shot of same subject made by a cropped camera and a 50mm lens what you will see ? But to be able to see the "...
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  • 12.5k
7 votes

How do I tell whether a Nikon DSLR or lens is full or cropped frame?

Let's start with some Nikon terminology. Nikon refers to their full frame cameras and lenses as “FX” and their cropped frame cameras and lenses as “DX”. The crop factor for Nikon cameras is ...
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  • 904
7 votes
Accepted

Should I quote focal length using equivalent focal length in a photobook?

The "equivalent" focal length draws from history, namely how it relates to a 35mm film camera, and there should come a time (and I think it is past) when we move on. The focal length IS the focal ...
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  • 2,288
6 votes

Why does this article say that a 1.5× crop factor sensor is 43% smaller than a 35mm film cell?

There are many various film and digital sensor sizes and formats. 135 film (also known as "full-frame") became the most used film in the 60s and the most common format was 3/2, meaning 36mm ...
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  • 2,655
6 votes

Is 35mm or 50mm better on a cropped DSLR for street photography?

You said you own an 18-55mm zoom lens. You can just set that one to 35mm and 50mm (there is a scale on the barrel that tells you what focal length your current zoom position corresponds to). That way, ...
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  • 985
6 votes
Accepted

Will a DX lens have severe vignetting on a 20x20mm?

The only guarantee is that a DX lens will throw an image circle approximately large enough to cover a DX sensor. Some throw them a bit larger, but the only way you'll know if a given lens does that ...
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  • 5,412
6 votes

Does say a 35mm on an APS-C camera have the same facial/other deformations as a 35mm?

Short answer no - it will be approximately equivalent to the 50mm lens on a full frame camera. What you are referring to are issues of perspective. The perspective is not a property of the lens but ...
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  • 564
6 votes

How does the smaller mirror in APS-C cameras offer these advantages?

Just about any wide angle (WA) or ultra wide angle (UWA) lens used with an interchangeable lens camera will use a retrofocus design. That does mean larger, heavier, and more complex than a non-...
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  • 168k
6 votes

Confused about T-stop number. Does it account for crop factor?

The f-stop is a simple ratio. It is the focal length divided by the working diameter. We use this value to compare the image brightness of one lens vs. another. The f-stop is often in error because it ...
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  • 36.3k
6 votes

How does crop factor affect perspective?

Not correct. Perspective (referring to the size and spacing of background objects relative to subject) is determined by only the distance of camera to subject. This is the geometry drawn from the ...
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  • 12.5k
6 votes
Accepted

What's the equivalent of a 85mm portrait lens on Sony A6500 (APS-C)?

Well, sort of. There's no such thing as absolute equivalence. In terms of angle of view a 55mm lens will give the same AoV with a 1.5X APS-C sensor as an 85mm lens on a 36x24mm FF camera. In terms ...
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  • 168k
6 votes
Accepted

Why doesn't full frame have faster shutter speed than crop (all other things equal)?

A full frame sensor gathers more light for the total area, but that's because there is more total area. The light gathered for the same sized portion of the recording medium is the same for any ...
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  • 140k
5 votes
Accepted

Why does this article say that a 1.5× crop factor sensor is 43% smaller than a 35mm film cell?

The article you've quoted and linked to just seems to have some bad maths. When they're subtracting the percentages from 100, they seem to have forgotten to 'carry the one', so to speak. They've ...
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  • 5,584
5 votes

Effective focal length of kit 16-50mm lens on A6000 (APS-C 1.5x crop factor)

On the Sony A6000 (1.5x crop factor) a 16-50mm lens is a 16-50mm lens. In fact, on any camera it is the same 16-50mm lens. What changes is the field of view that the lens can capture which changes ...
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  • 45.7k
5 votes
Accepted

Why are crop lenses indicated with focal lengths they don't have?

Because a 10 mm lens is a 10 mm lens. Crop factor has nothing to do with the real mm of a lens. Crop factor is the same as if you take your Photoshop and crop the center of a photo. Take a look at ...
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  • 20.8k
5 votes

Why are crop lenses indicated with focal lengths they don't have?

The 35mm film camera format has been with us since 1924 when the German Leica was introduced. The image size (format size) measures 24mm height by 36mm length. Now digital cameras are replacing film ...
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  • 36.3k
5 votes
Accepted

Macro with crop body

The maximum magnification is an expression of the size as it is projected onto the recording medium. That is, it is a reference to the size of the projection on the surface of the sensor or film. If ...
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  • 168k

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