Depth of field question- Crop / Full Frame

Started 5 months ago | Discussions thread
Tom Axford Veteran Member • Posts: 5,205
Re: Depth of field question- Crop / Full Frame
4

Pk8887 wrote:

I'm looking for a crop set camera for sports to lose some weight and gain and gain some length but am confused about depth of field and would like some help figuring out the following.

I like the background separation look I can get at 100mm f2.8 on my full frame 5dmk iii.

The rule you need to remember is that to get the same field of view and the same depth of field and background blur, you need a lens on your crop camera where both the focal length and the f-number are divided by the crop factor.  So, for a camera with a crop factor of 1.5 you need a 67mm f/1.9 lens to get similar pictures.

If I were to buy a crop camera and the lens was f2.8 from what I understood the background separation wouldnt be as obvious and the apparent depth of field wouldn't be as shallow (similar to f4 or f4.5 as i have read) due to the smaller sensor.

BUT as the crop would be a longer focal length in reality (1.5 x 100mm) and as focal length impacts the depth of field would it actually be similar?

In practical sense if I'm using a 2.8 lens on crop camera will I be able to achieve a similar shallow depth of field/backgroudn separation compared to a full frame equivalent at the same 'looking' focal lengths.

I may have just confused myself!

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