Samyang 10mm f/2.8 ED AS UMC CS lens detailed specifications



Update: this 10mm f/2.8 lens has already been announced last year. The Samyang 12mm f/2 will be a new mirrorless lens that will be announced during the next few weeks.

Either the information I posted two days ago got lost in translation or Samyang is preparing to announce another wide angle lens for mirrorless cameras. Either way, here are the detailed specifications for the Samyang 10mm f/2.8 lens:

  • Model: Samyang 1:2.8 10mm ED AS UMC CS lens
  • Aperture range: f/2.8 ~ 22
  • Optical construction: 14 element in 10 groups (2 aspherical elements)
  • Angle of view: 109.5˚(APS-C)
  • Minimum focusing distance: 0.25m (0.82ft)
  • Filter size: none
  • Length: 76.7 ~ 105.5 mm
  • Maximum diameter: Ф86mm
  • Weight: 710 ~ 740g
  • Mounts: Canon EOS, Canon M, Nikon, Pentax, Sony, Sony-E, FUJIFILM X, Samsung NX, Four-thirds, Micro Four Thrids
  • Lens multi coating
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  • vodanh1982

    That one is 10mm f/2.8 not 12mm f/2.0

    • Yes, like I said: something got lost in translation or they will release two lenses.

  • Sebastian

    Nice to see the optical schematics and the specs of the upcoming 10/2.8. Pretty heavy! That means good built, lots of glass, but more to drag around when hiking to wherever the sky is dark enough for the stars to be spectacular.
    As for a 12/2.0 mirrorless, I would also assume sth got lost in translation. That lens would be hard to do in f/2.0 for APS-C, and not very competitive for m43.

  • fjfjjj

    It looks like the forward aspheric (#5) is cemented to its neighbors. So how can its neighbors not be aspherics?

    • I think the two “gaps” before and after the forward aspheric are air spaces; it then counts up to 14 elements.

      Regardless, if the 10mm lens spec is also correct, that would be amazing for all the systems concerned.

      • Doesn’t CS mean it’s aps-c? At least for now?

        Also if the same lens is available for dslr mounts, it’s not the greatest news because it won’t be small on CSCs.

      • Sebastian

        Maybe I’m missing sth, but I think this is simply a cross-section of the 10/2.8 that has been delayed. It’s for DSLRs, so it can easily be modified to fit systems with shorter register, but, as is pointed out below, the inherent advantage of CSCs for short focal lengths is then wasted and the lens remains large.
        As usual on these ultra-wides, no filter. 86 mm is the outer diameter.

      • I’ve been slapping Leica R lenses on an E-M1, so I guess I don’t care about the size proportionality. We’ll see how the image quality holds up relative to price.

        The apparent lack of filter thread does bother me.

        Also, a lens tuned for APS will have lower absolute resolution than one tuned for µ43. But, a lens designed for APS won’t lose as much when used on µ43; crop factor between the formats is only 1.33x, and center performance is usually good on the Samyangs, and with retrofocus wides in general.

    • If you count the elements you can see the gaps arent greyed out. Likely a mistake.

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