Hubble's Staircase Effect: What Caused It and How Was It Fixed?

[Shilly]

Hubble "Staircase" effect?

Hi, I was just wondering why some of the older Hubble pictures have a staircase effect on them? Any help would be appreciated! Example below

edit: refer to examples in post #3

 

[Ich]

http://de.wikipedia.org/w/index.php?title=Datei:Jfader_hubble.jpg&filetimestamp=20081226211828

 

[Shilly]

OHHH so each quadrant is taken with a separate camera? Why is it no longer like this?

 

[Ich]

Because they changed the http://en.wikipedia.org/wiki/Wide_Field_and_Planetary_Camera_2" for the WFPC3 in 2009.