Yes, you may use your D200 Katz Eye screen on your new D300. The Katz Eye
screens for the D200 and D300 are physically and optically identical and may
be interchanged without problem. The D300 installation is slightly
different and to be sure that you don't have difficulty, please download our
new D300 installation guide:
www.katzeyeoptics.com/files/D300.PDF
Thanks for your continued patronage and if you have any other questions,
please feel free to ask.
Best regards,
Rachael Katz
Katz Eye Optics
+1.413.743.2523
www.katzeyeoptics.com