fwiw, your eyes become 'dark adapted' 1/2 hr to a 1hr after zero exposure to white light. Fine. This varies with age. ie; increases...
But, when you view an object that is faint ie; neb or the like where colour is known to be seen by others, just take your time at the E/Pc & let your eyes become 'dark adapted' to the new 'darker'? scene. You'd be surprised how the details & colours can be discerned after a few mins viewing.
Not really a matter of 'training your eyes' imho. If your eyes cannot 'see' colour, (sorry Slice & others), because of lack of cones or genetics etc, then you never will 'see it' in the fainter objects.. Just not enough 'light' to activate them..etc etc...
L.
Quote:
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flash yourself in the eyes with a torch just before taking a look at M42
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ps. Fringey, only if it's got a red or green LED in it....
