I can’t get my lens adjusted to be sharp (backfocal length). What can I do?

Some lenses have variable tolerances due to optical reasons.

The following camera series C-Mount models have an adjustable backfocal


  • Prosilica GX
  • Prosilica GT
  • Prosilica GE
  • Prosilica GC
  • Prosilica GS
  • Prosilica GB
  • Pike
  • Oscar

The information on the adjustment can be found in the corresponding camera manual:


All other cameras can be adjusted by using spacer rings.

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