Learn photography tech

Short read: What are DX and FX in a DSLR camera

DX and FX denote the image sensor size in a camera, which records the scene when you capture a photograph. It is the most expensive part of a digital camera and the whole camera is built around it.

© Diane Berkenfeld

FX is also known as full frame sensor and DX is known as cropped sensor. DX camera are cheaper and lighter than FX cameras. DX image sensor is about 50-60% of the size of a FX image sensor. Think of it as a hole in a cardboard box through which you are peeping. The bigger the hole (image sensor) the bigger is your view-able area. Size of the DX sensor depends on the manufacturer. If it’s size is 40% of that of FX, then it comes with a crop factor of 1.6. For example, if you’re using a 50mm lens in a DX camera with crop factor of 1.6, then the resulting lens will be of,

50mm x 1.6 crop factor = 80mm lens


100mm lens becomes 160mm lens

50mm lens becomes 80mm lens 

and so on.

Expensive cameras have large FX sensors which have no crop factor. FX camera’s produce images that are less noisy and better lit because of its high sensitivity to light.

Each lens is made in order to cast a circle on the camera’s sensor. As DX is smaller than FX, the circle casted on the sensor by DX is smaller as compared to FX lens.


The advantage that DX cameras have over FX is that they can work perfectly with both DX as well as non-DX lenses. However, you may use a DX lens with FX camera too, but it will come with a vignetting effect in the photographs.



12 comments on “Short read: What are DX and FX in a DSLR camera

  1. I will have to remember this when I purchase my first camera. For now, I use my tablet for photos.

    Liked by 1 person

  2. Claudia Krusch

    This is a great post for me. I am trying to elan more about taking photos. I just bought a dslr camera. I need to do a lot of practicing.

    Liked by 1 person

  3. Wow – I actually didn’t know that, and I thought I knew quite a bit about my DSLR camera! Thank you for sharing!


  4. Melanie

    I’m always looking to learn more about the tools I use as a blogger. This was clear and easy to understand.

    Liked by 1 person

  5. TColeman

    Photography has been something that I have been working on lately. This was such a great post for me to learn from.

    Liked by 1 person

  6. Krystle Cook

    I have to admit as long as I have been taking photos I never really knew the difference. This was a great read!

    Liked by 1 person

  7. I enjoy photography and I try to learn as much as I can with each camera I work with. Thank you for sharing!

    Liked by 1 person

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