19
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.
...
- 21.6k
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 ...
- 1,133
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 ...
- 172k
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 ...
- 50.5k
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 ...
- 1,060
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 ...
- 172k
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 ...
- 172k
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 ...
- 172k
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 ...
7
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, ...
- 1,040
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 ...
- 6,467
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 "...
- 12.8k
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 ...
- 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 ...
- 2,318
7
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 ...
- 12.8k
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 ...
- 2,755
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 ...
- 5,492
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 ...
- 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-...
- 172k
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 ...
- 37.7k
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 ...
- 172k
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 ...
- 142k
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 ...
- 37.7k
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 ...
- 22.1k
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 ...
- 5,694
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 ...
- 46.4k
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 ...
- 172k
5
votes
Accepted
Is it beneficial to use a crop sensor camera with a full frame telezoom?
By using an APS-C camera with higher pixel density, you will get "more pixels on the subject" than with a FF camera with lower pixel density.
Sometimes that can be a good thing.
There are many ...
- 172k
5
votes
Should I turn off image stabilization when I am taking a landscape shot?
The correct answer totally depends upon the specific lens and also upon the manner in which you desire to use it.
When using a lens on a tripod, some lenses require you to turn IS off, some do it ...
- 172k
4
votes
Light Capture of Full-Frame Lens on Crop Body
Your last sentence gets it right. The extra light is wasted because it falls outside the sensor area. In the approximation that your lens is a single thin lens (it is not, but it is a useful way to ...
- 1,844
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