void CLASS PentaxLensInfo (unsigned id, unsigned len)	// tag 0x0207
{
	ushort iLensData = 0;
	uchar *table_buf;
	table_buf = (uchar*)malloc(MAX(len,128));
	fread(table_buf, len, 1, ifp);
	if ((id < 0x12b9c) ||
		((id == 0x12b9c) ||	// K100D
		 (id == 0x12b9d) ||	// K110D
		 (id == 0x12ba2) &&	// K100D Super
		 (!table_buf[20] || (table_buf[20] == 0xff))))
	  {
		iLensData = 3;
		if (imgdata.lens.makernotes.LensID == -1)
		  imgdata.lens.makernotes.LensID =
			(((unsigned)table_buf[0]) << 8) + table_buf[1];
	  }
	else switch (len)
	  {
	  case 90:							// LensInfo3
		iLensData = 13;
		if (imgdata.lens.makernotes.LensID == -1)
		  imgdata.lens.makernotes.LensID =
			((unsigned)((table_buf[1] & 0x0f) + table_buf[3]) <<8) + table_buf[4];
		break;
	  case 91:							// LensInfo4
		iLensData = 12;
		if (imgdata.lens.makernotes.LensID == -1)
		  imgdata.lens.makernotes.LensID =
			((unsigned)((table_buf[1] & 0x0f) + table_buf[3]) <<8) + table_buf[4];
		break;
	  case 80:							// LensInfo5
	  case 128:
		iLensData = 15;
		if (imgdata.lens.makernotes.LensID == -1)
		  imgdata.lens.makernotes.LensID =
			((unsigned)((table_buf[1] & 0x0f) + table_buf[4]) <<8) + table_buf[5];
		break;
	  default:
		if (id >= 0x12b9c)				// LensInfo2
		  {
			iLensData = 4;
			if (imgdata.lens.makernotes.LensID == -1)
			  imgdata.lens.makernotes.LensID =
				((unsigned)((table_buf[0] & 0x0f) + table_buf[2]) <<8) + table_buf[3];
		  }
	  }
	if (iLensData)
	  {
		if (table_buf[iLensData+9] &&
			(fabs(imgdata.lens.makernotes.CurFocal) < 0.1f))
		  imgdata.lens.makernotes.CurFocal =
			10*(table_buf[iLensData+9]>>2) * powf64(4, (table_buf[iLensData+9] & 0x03)-2);
		if (table_buf[iLensData+10] & 0xf0)
		  imgdata.lens.makernotes.MaxAp4CurFocal =
			powf64(2.0f, (float)((table_buf[iLensData+10] & 0xf0) >>4)/4.0f);
		if (table_buf[iLensData+10] & 0x0f)
		  imgdata.lens.makernotes.MinAp4CurFocal =
			powf64(2.0f, (float)((table_buf[iLensData+10] & 0x0f) + 10)/4.0f);

		if (iLensData != 12)
		  {
			switch (table_buf[iLensData] & 0x06)
			  {
			  case 0: imgdata.lens.makernotes.MinAp4MinFocal = 22.0f; break;
			  case 2: imgdata.lens.makernotes.MinAp4MinFocal = 32.0f; break;
			  case 4: imgdata.lens.makernotes.MinAp4MinFocal = 45.0f; break;
			  case 6: imgdata.lens.makernotes.MinAp4MinFocal = 16.0f; break;
			  }
			if (table_buf[iLensData] & 0x70)
			  imgdata.lens.makernotes.LensFStops =
				((float)(((table_buf[iLensData] & 0x70) >> 4) ^ 0x07)) / 2.0f + 5.0f;
			if ((table_buf[iLensData+14] > 1) &&
				(fabs(imgdata.lens.makernotes.MaxAp4CurFocal) < 0.7f))
			  imgdata.lens.makernotes.MaxAp4CurFocal =
				powf64(2.0f, (float)((table_buf[iLensData+14] & 0x7f) -1)/32.0f);
		  }
		else if ((id != 0x12e76) &&	// K-5
				 (table_buf[iLensData+15] > 1) &&
				 (fabs(imgdata.lens.makernotes.MaxAp4CurFocal) < 0.7f))
		  {
			imgdata.lens.makernotes.MaxAp4CurFocal =
			  powf64(2.0f, (float)((table_buf[iLensData+15] & 0x7f) -1)/32.0f);
		  }
	  }
	free(table_buf);
	return;
}
Unknown