Quote Originally Posted by Thilo Schmid

You should adjust film development to your enlarger and not to your densitometer. If your densitomenter has the same light characteristics as your enlarger, it will produce the same results. Otherwise, your enlarger will produce different paper densities than expected. Again: you may apply some correction factor here, but this will depend on film/developer combination.
Arrrghhh...exactly, you develop for the type of enlarger, all current commercial densitometers are of the diffuse type, they all measure diffuse light. Again, if you want a densitometer that will measure specular light similar to a collimated condenser enlarger you would have to MAKE one.......I never said you have to adjust developing time to a densitometer, I said there are no densitometers which measure specular light similar to a condenser enlarger.