because the photographer views through one lens but takes the photograph through another, parallax error makes the photograph different from the view on the screen. this difference is negligible when the subject is far away, but is critical for nearby subjects. parallax compensation may be performed by the photographer in adjustment of the sight line while compensating for the framing change, or for highly repeatable accuracy in tabletop photography (in which the subject might be within a foot (30 cm) of the camera), devices are available that move the camera upwards so that the taking lens goes to the exact position that the viewing lens occupied. [mamiya's very accurate version was called the para-mender, and mounted on a tripod.] some tlrs like the rolleiflex (a notable early example is the voigtländer superb of 1933) also came with - more or less complex - devices to adjust parallax with focussing.