ExpoImaging ExpoAperture2 Depth-of-Field Guide Metric 2 Disc Kit, Includes Standard Dial and Telephoto Dial ExpoImaging ExpoAperture2 Standard Dial and Telephoto Dial - Sensor Format Reference Chart - Storage Pouch - CD-ROM Instructional Manual - Quick Start Guide - ExpoImaging Warranty Assert better creative control over depth-of-field Compensates for a wide variety of sensor formats and film sizes Develops an intuitive understanding of depth-of-field relationships with continued use Fast and easy to use