“This video tutorial in photoshop created by Aziz Khan. In this video you can learn how to fix the reference images when there is difference in proportions of image or used differenent focal length. Later, showed how to bring the reference images into Maya to put them in reference planes to start modeling. Total length of this video is 17 minutes and little increase the volume of your speakers because the sound is little low.”
http://www.cgarena.com/freestuff/tutorials/photoshop/setting_referenceImages/references.html