# Questions tagged [crop-factor]

"Crop Factor" refers to the sensor size of a camera relative to a 35mm (Full-Frame).

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### Do I use the crop factor in calculating aperture size and area?

How do I calculate the aperture size and area, considering an 35mm equivalent focal length value and non-equivalent aperture f-number (in terms of exposure, no multiplication of the crop factor of the ...
7k views

### Can a smaller sensor's "crop factor" be used to calculate the exact increase in depth of field?

If APS-C and similar crop-sensor digital cameras have a focal length multiplying effect such that a 50mm lens has an apparent focal length closer to the field of view of an 80mm on a full frame camera,...
228 views

### How does background blur and DoF vary with sensor size for a prime lens?

Let's assume I have a prime lens for full frame, with fixed specs (let's say 85mm f/1.8). Changing the lens is not an option, but I have a choice of a full frame camera and a crop sensor camera. The ...
863 views

### Clarification for Effect of Pixel Size on Depth of Field [duplicate]

From Wikipedia's depth of field article, $$\mathrm{DOF} \approx {2u^2NC \over f^2}$$ for a given circle of confusion ($C$), focal length ($f$), F-number ($N$), and distance to subject ($u$). ...
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### APS-C crop factor 1.5x or 1.53x

I'm having issues wrapping my head around how to get crop factor based on 35mm. I understand what crop factor is but my math is confusing me. For example, everyone knows that aps-c is a 1.5x crop ...
142 views

### Does a wide angle crop lens designed for crop sensors have the same FOV as their full frame equivalents? [duplicate]

I'm looking to get into real estate photography and I'm often advised that for full frame cameras you want something like an 18-35mm and in the same breath they also say if you have a crop sensor ...
1 vote
218 views

### camera sensor size, crop factor and object "magnification"

I have been reading some things about photography and most make sense, with some exceptions. About sensor sizes, I was reading this nice article where at some point, scrolling down, it says that with ...
1 vote
109 views

### If a CSC sensor is closer to the lens, wouldn't that cancel out the smaller sensor size when compare to a full-frame

The APS-C sensor in my camera has a 1.62 crop factor, but the sensor is also closer to the lens, so the image projected on the sensor should also should be smaller. Wouldn't the reduced distance (from ...
1 vote
314 views

### Canon 5D Mark IV - 4K Crop Factor [closed]

The Canon 5D Mark IV was launched with a crop factor of 1.74X back in 2016. Is this crop factor now lower thanks to a firmware upgrade as was rumoured back in 2017? The official spec sheet does not ...
392 views

### FOV on an APS-C and Full frame 'lens' [duplicate]

So this is a question about aps-c and full frame 'lenses' and not sensor format. My sensor here is constant - a Canon APS-C. This might be an already answered question but I couldn't find any that ...
3k views

### Do you get more bokeh on a APSC sensor with a full frame 50mm f/1.8 lens or a APSC 30mm f/1.4?

I am trying to compose a detail shot where I want to get as much background blur as possible. I am using Sony a6500 camera (APSC 1.5x crop factor body). I am considering two lenses: Sigma 30mm f/1.4 (...
1 vote
616 views

### How to mathematically crop photo from one camera to match view of another?

Imagine I take a photo of the same scene using two cameras, one right after the other, from the exact same spot. The cameras may be different in every way possible. They could have very different ...
501 views

### 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?

I have a Nikon D7500 which is a DX format camera. I am thinking of getting a Nikon 85mm lens but I only see one that is in FX format. I have a 70-300 lens in DX format and was wondering if I set the ...
247 views

### How does crop factor apply on lenses? [duplicate]

I understand that the crop factor of a sensor multiplied by the focal length of the lens equals the focal length of an equivalent 35mm lens. Also, there are well known differences between wide, ...
634 views

### Why don't my calculations based on a crop factor of 1.5 work for the Nikon P1000?

I know that Nikon cameras APS-C sensors has a crop factor of 1.5 but if we apply this to calculate the equivalent focal lenght in 35mm format for the Nikon P1000 camera we will not get the exact ...
2k views

### How to achieve a normal 50mm look with a Nikon APS-C camera?

I have an APS-C camera and want a lens that will achieve a normal 50mm look. Do I buy a DX 50 mm or get the FX 35mm? Will they have the same effect?
2k views

### Using FF lens on APS-C changes lens aperture value?

Someone told me that hen using Full frame lens on APS-C camera (1.5x crop factor) in addition to multiplying focal length by crop factor (e.g. 35mm * 1.5 = 52mm actual focal length on APS-C) you also ...
286 views

### Do you have to account for crop factor in the NPF rule?

The NPF rule is somewhat more "advanced" and more accurate than the 600 or 500 rule for astrophotography - both the latter tend to still produce star trails as camera resolution increased in ...
714 views

### How can I get the same image with the same 50mm lens on both FF and APS-C?

First things first, I'm talking ONLY about framing here. No light sensitivity, no bokeh quality, no pixel quantity, etc. A 50mm in a FF camera will give a certain composition and framing. How can I ...
1 vote
856 views

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

I enjoy amateur wildlife photography, and have always used crop camera bodies + long lenses, and usually shoot handheld. Obviously the main difficulty is that I need very fast shutter speeds to get ...
2k views

### How do I calculate the difference in lens reach between a superzoom compact and a DSLR zoom lens?

I know it's a beginner question, but I spent the last 3 days reading this forum and other resources on the Internet and I reached a breaking point. So decided to ask the question after all, as I ...
2k views

### Do medium format lenses have a crop factor?

When having a 50mm lens made for a APS-C camera its often the case that the lens has a focal length of 50mm on fullframe. However this means that you are getting something like a 75mm due to the crop ...
794 views

### Can a focal reducer be used with a teleconverter?

Can you use a focal reducer with a teleconverter? I don't believe it would be possible to do it but, is it? If I were to use a full-frame 50mm lens on a 2x teleconverter with a 0.71x focal reducer ...
2k views

### Is it beneficial to use a crop sensor camera with a full frame telezoom?

I have a Canon 100-400L telezoom lens. It gives up to 400mm of focal length, but when used on a crop sensor camera, the equivalent focal length would be 640mm. Because the equivalent focal length ...
23k views

### Does my crop sensor camera actually turn my lenses into a longer focal length?

So, I mount a 200mm lens on my Canon 450D. It effectively becomes a 320mm lens. Is this the equivalent of 320mm on a full frame camera? That is, from what I've figured out I get an equivalent field of ...
4k views

### How to calculate focal reducer crop factor for APS-C to MFT?

As far as I can tell, the crop factor determines the size of the projected image circle and should match the ratio of sensor diameters (with standard mount forward / backward distance). My ...
90k views

### 50mm vs 85mm for portraits on a crop sensor?

I've read several times that a 50mm lens will make features like noses noticeably stand out compared to an 85mm lens. However, I'm never sure if the post/article is describing results on a full frame ...
1 vote
5k views

### Does it make sense to buy a Sigma Art f1.4 for a crop sensor body?

Im currently shooting on a Nikon D5300 with a 35mm f1.8 and I looking for a quality telephoto portraiture lens. I'm interested in the Sigma Art 85mm f1.4 DG HSM. I saw the lens is versatile and my ...
2k views

### Field of view using 50mm APS-C lens on APS-C body vs 50mm FF lens on FF body? [duplicate]

I am taking 2 pictures using: Nikon D3400 APS-C sensor and an APS-C kit lens, 18-55mm set at 50mm Nikon D850 full frame camera and a full frame lens 50mm that is designed for full frame Nikon ...
2k views

### How can I see the equivalent focal length of the current zoom of my Nikon P900?

I have a P900 that I use for birding. It's great for carrying around and not so great when (as usual) the light is low. I'm considering using an alternate set-up, for example a D500 coupled with a ...
3k views

### How does crop factor affect perspective?

I have a question about crop factor and how it affects the perspective. Suppose you have one Super 35 camera and one APS-C camera. As far as I understand, to photograph the same image on the APS-C ...
14k views

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

When conventional wisdom refers to 85mm as the perfect lens for portraits, it refers to 85mm for a full frame sensor. Is this right? In that case, is it correct to apply the crop factor and say a 55mm ...
2k views

### Which lens focal length to match binoculars' magnification: An alternative approach

The question of how lens focal length and binocular magnification appears to have been asked over 3.86 quinzillion times. Regardless, it's still hard to get an answer the layman can understand. I'd ...
1 vote
1k views

### Does crop factor affect light meter readings?

I was reading about crop factors that for example a Polaroid land camera on f/3.2 lens is something around f/1.4 equivalent in <...
46k views

### What is "angle of view" in photography?

I read on the Lens Buying Guide @ neocamera: Focal-length determines the angle-of-view seen through a lens for a given sensor-size. With a full-frame sensor a lens gives the same angle-of-view ...
5k views

### Crop Factor in real world, Sigma 150-600mm C on Canon 1300D [duplicate]

After I bought Sigma 150-600mm f5-6.3 Contemporary DG OS HSM Lens I ran some tests. This test was to see the difference in focal length compared to a crop sensor lens vs this full frame lens on a same ...
9k views

### Why don't comparisons of aperture take sensor size into account?

When one compares focal length, many times we use the 35mm equivalent length. A 50mm lens on an APS-C sensor camera(1.6x) would be a 80mm equiv. length on a full frame camera. But when we state the ...
157 views

### Can I emulate a fullframe sensor with angular lens? [duplicate]

If I'd use a 30mm lens on a crop sensor, would it be like a fullframesensor with a 50mm on it? 30*1.6=48~50
2k views

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

I understand that a T/stop number deals with how much light is let in, instead of the sensor size vs. aperture like the f/stop number. However, what I haven't found is whether or not that T/stop ...
1k views

### FX & DX Lenses on DX Body [duplicate]

If I use a 50mm prime FX lens on a FX camera, I will get 50mm. If I use a 50mm prime FX lens on a DX camera, I'll get 75mm (assuming 1.5x crop factor). Now, if I use a 50mm prime DX lens on a DX ...
5k views

### Is the kit lens focal length specified for APS-C or FF?

I have the 18-55mm kit lens for my Canon 50D and was wondering if they're still specified against full frame 1:1 crop? Would my 18mm actually be 1.6x? I ask because I doubt anyone with a full frame ...
1 vote
5k views

### Crop Sensor Enhances Zoom? [duplicate]

Possible Duplicate: What is the difference between focal length and crop factor? Does my crop sensor camera actually turn my lenses into a longer focal length? I keep reading about how crop-...
1k views

### Full frame lens works normally on Nikon DX body [duplicate]

I have the Nikon D5300 and it comes with a kit 18-55mm. I've been looking to get a 50 prime, and my friend has two (1.4 and 1.8) which she let me try out yesterday. So, my camera is not full frame, ...
1 vote
115 views

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

I'm putting together a (non-commercial) photobook from a year in a foreign country. I took all the photos with the Canon EOS-M3 which has an APS-C sensor (crop factor 1.6). I want to quote the ...
1 vote
463 views

### What mm equivalent is my Kodak No. 31 Anastigmat F 4.5 5 1/2 inch lens?

I just purchased an old large format Speed Graphic camera. It came with a Kodak No. 31 Anastigmat F 4.5 5½ inch lens on a Compur shutter. I was wondering what equivalent mm focal length of this lens ...
4k views

### Does a Nikon DX lens on a FX camera get subjected to the 1.5X crop factor?

My friend has a Nikon 35mm DX lens that I want to use on my FX camera. If I use his lens on my camera in DX mode, does the effective focal length of the lens become ...
1k views

### Will cropping an FX image to DX size have the same end detail for sensors with the same MP?

Let's say I have a 90mm and an 135mm lens, and Nikon's 24mp full frame and 24mp APS-C DSLR. Assume they are the same optically. Now, based on what I understood, doing a DX-crop on the image taken by ...
4k views

### Does wide angle equivalent in crop sensor skew image?

I see many posts on both this forum and elsewhere the discuss the use of a wide angle on a crop sensor. For example, they discuss how at 14mm lens is 14mm on a 35mm film or full frame, but with a 1....