Anybody had any experience with the Nikon F6 Focusing screens ($30 at Adorama...http://www.adorama.com/NKSBF6.html?searchinfo=nikon%20focus%20screen&item_no=11)
Are they same size as Nikon D screens for the F3 camera?

Looks like this site....http://www.mir.com.my/rb/photography/hardwares/classics/nikonf3ver2/screens/
explains all the types of Nikon focusing screens. Also, according to that site the Type B screen is the one with the circle in the center with the Type D being the only one that is clear of any guides. Nikon F6 at Adorama is Type B but it is advertised as "Overall Matte surface". Whats up with that?

I guess its just me talking to myself now. If anybody is interested, here is the link that talks more about these screens http://www.mir.com.my/rb/photography/hardwares/classics/NikonF5/Screens/index.htm

From what it seems that F6 Screen is little bigger than the F3(Nikon D) and thus will be unusable in the Thorlabs tube. If you are not using thorlabs than F6 is the way to go because the article above mentions that they are brighter.(Plus it costs the same as F3)

Also, the Type B F6 screen is in fact clear of any markings. They just use different Type classification from the F3 screens.