Canon diopters are rated based on their total effect when mounted on a film camera with a standard -1 diopter viewfinder. So a -1 does nothing. It says my right eye is +2.25 Sphere with a slight nearsighted astigmatism of -.75. Diopter strength refers to the optical power of a lens. It's commonly applied to reader-strength eyeglasses or bifocals, as well as telescopes & other magnifying lenses. Lenses with a focal length – defined as the distance between the center of a lens and the point at which objects are brought into clear focus – of 1 meter (about 39 inches The camera's adjustable dioptric range is -2.5 to +0.5 dpt. Remove the eyecup. While grasping sides toward the bottom of the eyecup, slide it upward to remove. Turn the dioptric adjustment knob. Turn the knob to the right or left until the focusing points look sharp in the viewfinder. The diagram shows the knob set at the standard diopter (-1 dpt) Corrective lenses (available separately; 0 Other Accessories) can be used to further adjust viewfinder diopter. Before attaching a diopter-adjustment viewfinder lens, remove the DK-17F viewfinder eyepiece by closing the viewfinder shutter to release the eyepiece lock ( ) and then grasping the eyepiece lightly between your finger and thumb and diopter adjustment in Canon Digital Cameras. The viewfinder apparent distance is 30" - 36". You ought to be able to read the viewfinder that is properly adjusted with the same ease as if you were looking at a printed page held at 30-36" (of course, assuming text which is not to small/large for 20/20 vision when reading) 5. Equipment: EOS 6D. 24-105m. 100-400mm. I must be doing something wrong. I have my trusty EF 24-105mm L lens attached via a genuine Canon EF EOS-R adapter. Things seem to be ok so far but the viewfinder (with rear screen closed) is never in focus whatever the dioptre adjustment. I have tried 7 or 8 times, from one end of the range to the Comparing the D800 and 5D MK III, it seems to me that the diopter 'jumps' in larger, far more discrete intervals on the D800, relative to the Canon. With the Canon, I find I'm able to tweak the VF perfectly to my liking; on the D800, my preferred diopter adjustment strikes me as approximately right, at best. I would get the -2 or -3 adjustment lens. This is because the 5D mark II has a built in diopter adjustment from -3 to +1 (centre point = -1). From what I have read on the web the marked value on the adjustment lenses becomes the new centre point of the built in adjustment, so a -3 lens would give you -5 to -1 adjustment. Hope this helps Vay Tiền Trả Góp 24 Tháng.

diopter adjustment on canon camera