The O-ME53 magnifying eyecup works with all PENTAX DSLR bodies offering 1.2 times magnification over the entire image field. This magnification is ideal for critical focusing and when using manual focus lenses.
Optional Nikon eyepiece diopters allow you to optimize your SLR
viewfinder's sharpness in conjunction with your individual eyesight. Eyepiece diopters are designed for specific camera models and are identified by a plus, a minus or a neutral numeric diopter ...