Granted, the no. of frames left in ANY
mode will always be just a guesstimate - however, in RAW
mode on the D70 when the card is near empty the no. of frames left displayed is well off the mark. It's based on uncompressed NEF file sizes while the D70 does not support this
mode. In any of the JPEG
modes, its guesses are far closer to the truth. This is a "bug" I believe, yet to be addressed with firmware.
As for the hood - as mentioned above, you don't just 'slide' it a quarter turn, you slide it and twist it with great force until it 'clicks'.