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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. ...
Tetsujin's user avatar
  • 23.4k
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 ...
Jim Garrison's user avatar
  • 1,153
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 ...
Michael C's user avatar
  • 175k
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 ...
inkista's user avatar
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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 ...
Michael C's user avatar
  • 175k
9 votes

Struggling to find DX-fit telephoto lenses. Advice?

You can use Nikon FX lenses on Nikon DX cameras. The smaller DX sensor will only capture the center portion of the larger FX image circle projected by the lens. The angle of view with a DX camera will ...
Michael C's user avatar
  • 175k
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 ...
aaaaa says reinstate Monica's user avatar
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 "...
WayneF's user avatar
  • 12.9k
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]) ) ...
flolilo's user avatar
  • 6,468
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 ...
NoahL's user avatar
  • 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 ...
Linwood's user avatar
  • 2,363
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 ...
WayneF's user avatar
  • 12.9k
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-...
Michael C's user avatar
  • 175k
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 ...
John's user avatar
  • 564
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 ...
Blrfl's user avatar
  • 5,572
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 ...
Alan Marcus's user avatar
  • 39.2k
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 ...
Michael C's user avatar
  • 175k
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 ...
mattdm's user avatar
  • 143k
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 ...
Alan Marcus's user avatar
  • 39.2k
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 ...
Rafael's user avatar
  • 24.9k
5 votes
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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 ...
Michael C's user avatar
  • 175k
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 ...
Michael C's user avatar
  • 175k
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 ...
Michael C's user avatar
  • 175k
4 votes

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

The interior of the camera is coated with a light absorbent paint plus the surroundings are shaped like the insides of a bellows. The accordion shape has sharp angles that reduce internal reflections. ...
Alan Marcus's user avatar
  • 39.2k
4 votes
Accepted

What’s an equivalent focal length of a fullframe lens on a crop sensor?

The focal length of the lens does not change. It remains a 58mm lens. What changes is the field of view the lens yields on the new, smaller format. The field of view will be similar to that a 58x2 => ...
inkista's user avatar
  • 52.2k
4 votes

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

That lens is designed to be used for APS-C sized sensors with the Canon EF-S mount. It projects a smaller image circle than is needed to cover the larger full frame sensor of your 6D. Most third party ...
Michael C's user avatar
  • 175k
4 votes

Macro with crop body

The magnification will be 1:1, unchanged with that lens at 1:1 on any body. The only difference is that the cropped body will crop the image. Say you photograph some 15 mm object at 1:1 with both ...
WayneF's user avatar
  • 12.9k
4 votes

Can a larger format lens provide more light to a crop sensor for a given f-stop?

Assuming I understand what you're saying, the answer is no. Or, depending on how you look at it, yes, but. The optics you use to squeeze that full-frame image into the smaller size are effectively ...
mattdm's user avatar
  • 143k
4 votes
Accepted

Nikon 35mm 1.8g or 50mm 1.8g on D3200?

For portraiture on crop sensor cameras, the 50mm lens is a better choice. The ideal portrait lens in general is about two times the diagonal of the image capture - about 100mm on 35mm and full-frame ...
Jim MacKenzie's user avatar
4 votes

Are there lenses which can give 180° fisheye circle with a cropped-frame camera?

What you're probably looking for is a circular fisheye lens for APS-C. Fisheye lenses come in one of two types: circular or diagonal. Circular ones put the entire image circle inside the frame of the ...
inkista's user avatar
  • 52.2k

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