Where DSLRs use a focusing sensor that is separate from the sensor chip, mirrorless cameras calculate their focus directly off the imaging sensor chip. Mirrorless camera users are in luck, since the majority of mirrorless cameras use an entirely different method for their focus calculations. (Landscape photographers and others who shoot at low apertures probably wonвЂ™t notice slight focus issues much.) Add your lens being a little off and youвЂ™ll likely find yourself with the focus just a bit off more often than not. Shooting wide open already has a narrow window of error. YouвЂ™ll also want to calibrate your lenses if you tend to shoot at your widest aperture or are using a particularly fast lens. However, if youвЂ™re using a high megapixel camera (say 25MP or above), any error in focus is likely to be obvious. 12MP) either вЂ“ slight focus issues donвЂ™t tend to be as noticeable then. You probably wonвЂ™t need to if youвЂ™re shooting with a low-megapixel camera (i.e. If youвЂ™re shooting with a DSLR and not having focus problems, you donвЂ™t particularly need to calibrate each of your lenses. WeвЂ™re only talk about changing settings in your camera. Note: Lens calibration doesnвЂ™t make any physical changes to your lens or camera. ItвЂ™s really an awesome feature, and crucial for all DSLR users. Once dialled in, your camera will save these settings to memory and automatically load them in when you use this lens. Move the point into the negative numbers (closer to the camera) to compensate for back focusing and into the positive numbers (away from the camera) for front focusing. On most cameras, the focus point can be adjusted in small increments, usually spanning from -20 to 0 +20. If the area thatвЂ™s sharp is in front of the spot your were targeting (front focusing) youвЂ™ll want to move the spot farther out. If your lens has its focus shifted behind the area youвЂ™re targeting (back focusing) youвЂ™ll want to shift the focus point towards the camera body. If youвЂ™re shooting with a modern DSLR, your camera probably has a setting вЂ“ usually called AF Microfocus or AF Fine Tune вЂ“ that allows you to move the focus point either closer to the camera body or farther away from it. These variances are what lens calibration addresses. The exact spot where light is being focused onto the sensor doesnвЂ™t always end up in the same place. We spend a lot of money on camera gear вЂ“ and expect it to work as described вЂ“ but what weвЂ™re not told is that from manufacturer to manufacturer and lens copy to lens copy there are almost always slight variances.

Reikan focal af fine tune calibration