best lens that mimics eyes.

Discussion in 'Digital Photography' started by AdamRock, Dec 8, 2010.

  1. AdamRock macrumors 6502a


    Aug 30, 2010
    Which canon lens best mimics eyes? so far i'm thinking of just getting the 50mm 1.8 as its the closet to eyes i could find :/
  2. Policar, Dec 8, 2010
    Last edited: Dec 8, 2010

    Policar macrumors 6502a

    Nov 21, 2004
    In terms of field of view, it's impossible to say because it's entirely reliant on viewing distance. If you're close to the print, a wide angle is natural; if you're across the room, a telephoto is natural.

    That said, a "normal" lens, meaning undistorted linear perspective, for full frame is 43mm; for 1.6x crop, maybe 28mm. But generally, 50mm and 35mm, respectively, are referred to as normal, since they're the closest common focal lengths.

    Generally, deep focus feels more naturalistic, as the eye has a relatively small aperture and focuses automatically. An out of focus foreground, in particular, can feel very unnatural (which is a good thing if it's what you want, but it seems it isn't). So shooting around f8 or f11 and avoiding really close foreground elements can help make a scene feel more naturalistic since everything will be in acceptable focus most of the time.

    You may also want to correct for converging vertical lines (tilt/shift lens) or crop appropriately in photoshop for a more natural feel. The eye automatically makes vertical lines feel straight, and so have painters corrected for this distortion since the Renaissance. (Look at trees and buildings in amateur photos as compared with how they look in paintings to see what I mean.) Lenses don't do this automatically, so you need a tilt/shift lens or post correction (trivially easy in Photoshop, but you lose a little resolution) unless you're shooting straight at the horizon.

    So, uh, the most "normal" lens would be the 45mm tilt/shift on full frame, shot for deep focus and corrected perspective. Unfortunately, the normal focal length is also kind of boring at times, or at least difficult to make super exciting. The 50mm f1.8 seems like a good choice, too--natural for full frame and a nice focal length for crop sensors, aesthetically. I actually prefer 50mm on a crop body, even though (or maybe because) it's a little longer than standard.
  3. gammamonk macrumors 6502a


    Jun 4, 2004
    Madison, WI
    I have the canon 50mm 1.8. When I look thru the viewfinder with one eye and open my other eye everything is exactly the same size. I can even regain depth perception after a few seconds. It's hugely cropped versus your normal vision of course.
  4. chrono1081 macrumors 604


    Jan 26, 2008
    Isla Nublar
    Are you on a full frame? If so 70mm is the closest match for me on a 5D2. But at others have stated this is very subjective.
  5. AdamRock thread starter macrumors 6502a


    Aug 30, 2010
    ah ok ill just get the 50mm.

    thanks man :)
  6. compuwar macrumors 601


    Oct 5, 2006
    Northern/Central VA
    It's not subjective, it's very measurable- it's just not consistent ;)

    The field of view of the human eye varies based on the distance and focal point from the nose. Generally though, the AOV is somewhere between 100 and 140 (130 being often quoted) degrees- most often equated with a 17mm lens in 35mm terms- however, the magnification is closer to ~48mm on average. So you'll need to make panoramas to approach what the eye sees.

  7. rpang, Dec 9, 2010
    Last edited: Dec 10, 2010

    rpang macrumors member

    Apr 20, 2009
    So Cal...
  8. toxic macrumors 68000

    Nov 9, 2008
    perspective is most closely preserved with a "normal" lens, meaning the focal length is the same as the diagonal of the sensor. for 35mm film, this is 43mm, and for APS-C it's ~28mm.

    in terms of AoV, it depends...what you can focus on is very narrow, but peripheral vision is very wide.

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