The Canon EOS R7 is here, and it is time to set up this camera for use. Following are the 48 steps taken to prepare an out-of-the-box EOS R7 for use. Record serial number and add camera to insurance policy; Open the box, find the battery, place it in the charger, and plug it in. While the battery is charging, unpack the other items you want As I recall (and this can be a little confusing), the OM body eyepiece lenses have a built in power of -0.5. So, if you need a minus 2, and you buy an Olympus diopter, diopter lens is really a -1.5, -1.5 plus eyepiece -0.5 equals -2.0. If you go to an optometrist and get him to make a -2 for you, you'll put it on the camera and it becomes -2.5.
Approx. 0.8x (-1 diopter with 50mm lens at infinity) Eyepoint : Approx. 20 mm: Built-in dioptric adjustment-3.0 – +1.0 diopter : Focusing screen : Fixed, precision matte: Mirror : Quick-return half mirror (Transmission: reflection ratio of 40:60, no mirror cut-off with EF600mm f/4L IS USM or shorter lenses) Viewfinder information
With a lens mounted and a subject focused on, adjust the viewfinder diopter until the scene is sharp; I make additional menu and other setting changes based on current shooting scenarios, but this list covers my initial camera setup process. To copy this configuration means you intend to shoot as I do - including in RAW-only format.

Thus 50mm = 20 diopters and 120mm = 8.33 diopters. The total is 28.33 diopters. Now we convert back to millimeters thus 1/28.33 X 1000 = 35.3mm (the focal length of the combination). The power of the reading glasses in diopters and the adjustment of the camera eyepiece correction are the same.

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diopter adjustment on canon camera