Pentax 645NII vs 645N
Many of the new features incorporated into the 645NII are a response to the valuable suggestions and requests offered by enthusiastic 645N users, based on their experiences in actual photographic sessions. Pentax believes these added features will be extremely useful in a variety of applications and situations, and will make the 645NII more responsive and user-friendly than its predecessors for photographers around the world.

New features of the Pentax 645NII
Mirror-up function: A new mirror-up position has been added to the drive mode dial. The first press of the shutter release button swings the mirror up and locks it in place; the second press releases the shutter. This new function avoids unwanted camera shake at shutter release and improves exposure accuracy.

Choice of EV increments in exposure compensation and auto bracketing: In exposure compensation and auto bracketing modes, the user now has a choice of 1/2EV or 1/3EV increments within a ±3EV range. This allows the user to set the desired compensation value far more easily to create the intended visual effect.A wider range of on-the-film imprinting iformation: The 645NII allows the imprinting of a wider range of photographic data onto the film than was possible with the 645N. The new data includes: total number of film rolls, focusing mode, ISO film speed, use of the AE lock and/or auto bracketing functions, and use of flash synchronization.

Improved Pentax Functions: The Pentax Functions, designed to allow customization of some of the camera's basic functions to suit individual preferences, are now more user-friendly than before. The user can select whether or not the camera identification symbol is added to the on-the-film imprinting data, so that a check can be made afterwards on which camera was used to take a particular roll of film.

Compatibility with new electronic accessories: The 645NII is designed to accept the new generation of electronic accessories, such as the CS-105 and CS-130 Cable Switches and the TS-110 Release Timer Switch, for added convenience.