APS-C vs full-frame depth of field

Amateur Photographer - - Tech Talk - Q&A com­piled by Ian Burley

QI use a Canon EOS M5 and a friend has an EOS 5D Mark II. Can my M5 give the same level of lim­ited depth of field as his full-frame cam­era, with a sub­ject framed head and shoul­ders? I use an 18-135mm f/3.5-5.6; he uses a 24-70mm f/2.8. I think I could stand fur­ther back us­ing 135mm and this would at least match his 70mm. Fen Ca­ble

AYou’re not quite cor­rect. Let’s say you both stand the same dis­tance from the sub­ject, with both lenses at widest aper­ture and the 5D Mark II at 70mm and your M5 at 45mm so the framed view would be the same. Your M5 would pro­duce about twice as much depth of field. You’d need to stand a lit­tle more than three times fur­ther away from the sub­ject with your zoom at 135mm to main­tain the same fram­ing of the sub­ject. But if you do the cal­cu­la­tions, the depth of field will be hardly any dif­fer­ent. That said, depend­ing how far be­hind the sub­ject the back­ground is, that back­ground could be sig­nif­i­cantly dif­fer­ent. You’d see less of the back­ground be­cause of the nar­rower field of view and it would ap­pear to be more out of fo­cus. So, maybe, you’re half cor­rect.

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