Ken, could you give me a basic "Expo Disc for Dummies"? I have seen this posted but have yet to use one...
The following is from the Expodisc web site. But, you don't "install" the disc (unless it is the right mm size for the lens - I have a 77mm disc, so I hold it tightly against the front of any one of my lenses so that no light can get in around the edges. If you have any question that isn't covered by this "boilerplate", just ask! Every time I don't have it with me I kick myself later! The instructions follow the picture: I didn't have my disc with me....went into the dining room, and no WB setting I tried worked because of the different types of lighting and the entire ceiling was a glass skylight. Finally I just went to a white chair and used it to set the WB and it turned out well anyway!
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Nikon D70
Set the correct manual exposure ("M" mode) or allow the camera to set an automatic exposure using the "P" "S" or "A" modes.
Install the EXPOdisc
Set camera to Manual Focus mode
Push and hold ‘WB’ button with left thumb while turning right thumb wheel to select ‘Pre’ in the control panel, then release ‘WB’ button
Push and hold ‘WB’ button again until ‘Pre’ begins to blink in the control panel
While ‘Pre’ is blinking (10 seconds), aim camera towards scene or light source to balance and press the shutter release button
‘Good’ will replace ‘Pre’ in the control to indicate a successful balance capture
If ‘no good’, then repeat steps 4 and 5 until you see ‘good’ flash in the control panel (too much, or too little light may result in a ‘no good’ reading)
Press the shutter release button to exit menu functions
Remove the EXPOdisc, return camera to auto focus mode, and start shooting
Repeat procedure whenever the lighting changes.