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A place to politely discuss the tools, technique and culture of photography.

This is not a good place to simply share cool photos/videos or promote your own work and projects, but rather a place to discuss photography as an art and post things that would be of interest to other photographers.

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Are focal lengths on crop sensor lenses same as full frames ? (alien.top)

submitted 1 year ago by jlole@alien.top to c/photography@viewfinder.pro

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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.

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[–] oldskoolak98@alien.top 1 points 1 year ago (1 children)

iow, normal is a natural representation of near -far objects. Our peripheral is way wide, but a spherical vs flat focal plane is a game changer. No comparison. On a flat plane, any lens that projects our field of vision in its entirety will inevitably lead to terrible near-far relationships with subjects.

Btw, I'll never fly delta if you're ever behind the sticks.

[–] ApatheticAbsurdist@alien.top 1 points 1 year ago

Near-far is perspective. That is purely controlled by distance of viewer-to-subject. Focal length (combined with sensor/frame-size) just chooses the angle of view (or “crop” if you want to think about it in how we see a wider field of view with our eyes) once you’re at that given distance/perspective.

I haven’t been at the yoke in over 20 years and that was only single engine props.