Not quite. The original remark was about a true stereo SLR, thus with a stereo finder. By turning your head with the camera you could experience stereoscopic view (as that camera reveiled it) even over panning.
Viewmaster only offered a static image. Seitz in contrast designed a film viewer that offered you a respective continuous stereoscopic view when you panned your film viewer.
Viewmaster only offered a static image. Seitz in contrast designed a film viewer that offered you a respective continuous stereoscopic view when you panned your film viewer.