I dont mean when for example 35mm on a crop sensor “equals” a 50mm on a full frame camera. My question is a bit weird, here we go.

So i have a 18-55mm lens (on a crop camera) and people say that 50-55mm is the focal length of the human eye. Here, my experiment comes into the play:

My camera has a 1.5x crop factor so 35mm looks like 50 mm on a full frame because of narrower field of view right? So when people say field of view of a 50mm on a full frame is the same as your eye, my first thought is 50mm on a full frame = 35mm on my camera. Then what i do is i take my camera put it on 35mm and then look at the vizor. What i expect is no zoom at all but the objects look smaller in the vizor (so fov is higher). When i put my camera at 55mm, the objects size match up with exactly what i see. But from what i learned 35mms should be like a 50mm on a full frame therefore it should match my eye.

So here comes my question:

Are the numbers of focal lengths on my lens already multiplier by 1.5x ? So do i have to subdivide the numbers to get the full frame equivalent ?

Sorry for spelling mistakes.

  • jlole@alien.top
    OPBEnglish
    1·
    1 year ago

    Oh i get it. İm asking this question because i am looking to buy a 200mm lens but is it going to look like a full frame on a 300mm or is it going to look like a full frame on a 200mm

    • TheDamien@alien.topBEnglish
      1·
      1 year ago

      I used to use an 18-200 on a crop sensor and I currently use a 28-300 on a full frame sensor. They’re basically the same.

    • Sneezart@alien.topBEnglish
      1·
      1 year ago

      A 200mm lens mounted on a 1.5 crop sensor will offer the same fov as a 300mm lens mounted on a full frame sensor.