pincushion

[holty]

can someone explain what pincushioning is and how to get rid of it
cheers
Grahame

 

[StewartR]

It's a kind of distortion you get with some lenses. Towards the edges if the picture, lines which should be straight are bent inwards towards the centre. Imagine having a sea horizon towards the bottom of the picture: it will bulge upwards in the middle.

You can fix it with most software tools these days. Programs like Lightroom can use the known characteristics of the lens to correct it automatically. Other programs have distortion or transformation tools which allow you to correct it manually by eye.

 

[Scarecrow]

The opposite is known as barrel distortion, where straight lines near the edge of the frame bulge away form the centre.

 

[holty]

thanks for the replys now i understand

cheers grahame