void CLASS processNikonLensData (uchar *LensData, unsigned len)
{
  ushort i;
  if (!(imgdata.lens.nikon.NikonLensType & 0x01))
    {
      imgdata.lens.makernotes.LensFeatures_pre[0] = 'A';
      imgdata.lens.makernotes.LensFeatures_pre[1] = 'F';
    }
  else
    {
      imgdata.lens.makernotes.LensFeatures_pre[0] = 'M';
      imgdata.lens.makernotes.LensFeatures_pre[1] = 'F';
    }

  if (imgdata.lens.nikon.NikonLensType & 0x02)
    {
      if (imgdata.lens.nikon.NikonLensType & 0x04)
        imgdata.lens.makernotes.LensFeatures_suf[0] = 'G';
      else
        imgdata.lens.makernotes.LensFeatures_suf[0] = 'D';
      imgdata.lens.makernotes.LensFeatures_suf[1] = ' ';
    }

  if (imgdata.lens.nikon.NikonLensType & 0x08)
    {
      imgdata.lens.makernotes.LensFeatures_suf[2] = 'V';
      imgdata.lens.makernotes.LensFeatures_suf[3] = 'R';
    }

  if (imgdata.lens.nikon.NikonLensType & 0x10)
    imgdata.lens.makernotes.LensMount = LIBRAW_MOUNT_Nikon_CX;
  else
    imgdata.lens.makernotes.LensMount = LIBRAW_MOUNT_Nikon_F;

  if (imgdata.lens.nikon.NikonLensType & 0x20)
  {
    strcpy(imgdata.lens.makernotes.Adapter, "FT-1");
    imgdata.lens.makernotes.LensMount = LIBRAW_MOUNT_Nikon_F;
  }

  imgdata.lens.nikon.NikonLensType = imgdata.lens.nikon.NikonLensType & 0xdf;

  if (len < 20) {
    switch (len) {
    case 9:
      i = 2;
      break;
    case 15:
      i = 7;
      break;
    case 16:
      i = 8;
      break;
    }
    imgdata.lens.nikon.NikonLensIDNumber = LensData[i];
    imgdata.lens.nikon.NikonLensFStops = LensData[i + 1];
    imgdata.lens.makernotes.LensFStops = (float)imgdata.lens.nikon.NikonLensFStops /12.0f;
    if (fabsf(imgdata.lens.makernotes.MinFocal) < 1.1f)
    {
      if ((imgdata.lens.nikon.NikonLensType ^ (uchar)0x01) || LensData[i + 2])
        imgdata.lens.makernotes.MinFocal = 5.0f * powf64(2.0f, (float)LensData[i + 2] / 24.0f);
      if ((imgdata.lens.nikon.NikonLensType ^ (uchar)0x01) || LensData[i + 3])
        imgdata.lens.makernotes.MaxFocal = 5.0f * powf64(2.0f, (float)LensData[i + 3] / 24.0f);
      if ((imgdata.lens.nikon.NikonLensType ^ (uchar)0x01) || LensData[i + 4])
        imgdata.lens.makernotes.MaxAp4MinFocal = powf64(2.0f, (float)LensData[i + 4] / 24.0f);
      if ((imgdata.lens.nikon.NikonLensType ^ (uchar)0x01) || LensData[i + 5])
        imgdata.lens.makernotes.MaxAp4MaxFocal = powf64(2.0f, (float)LensData[i + 5] / 24.0f);
    }
    imgdata.lens.nikon.NikonMCUVersion = LensData[i + 6];
    if (i != 2)
      {
        if ((LensData[i - 1]) &&
            (fabsf(imgdata.lens.makernotes.CurFocal) < 1.1f))
          imgdata.lens.makernotes.CurFocal = 5.0f * powf64(2.0f, (float)LensData[i - 1] / 24.0f);
        if (LensData[i + 7]) imgdata.lens.nikon.NikonEffectiveMaxAp = powf64(2.0f, (float)LensData[i + 7] / 24.0f);
      }
    imgdata.lens.makernotes.LensID =
      (unsigned long long) LensData[i] << 56 |
      (unsigned long long) LensData[i + 1] << 48 |
      (unsigned long long) LensData[i + 2] << 40 |
      (unsigned long long) LensData[i + 3] << 32 |
      (unsigned long long) LensData[i + 4] << 24 |
      (unsigned long long) LensData[i + 5] << 16 |
      (unsigned long long) LensData[i + 6] << 8 |
      (unsigned long long) imgdata.lens.nikon.NikonLensType;

  }
  else if ((len == 459) || (len == 590))
    {
      memcpy(imgdata.lens.makernotes.Lens, LensData + 390, 64);
    }
  else if (len == 509)
    {
      memcpy(imgdata.lens.makernotes.Lens, LensData + 391, 64);
    }
  else if (len == 879)
    {
      memcpy(imgdata.lens.makernotes.Lens, LensData + 680, 64);
    }
  return;
}