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<blockquote data-quote="Rexer John" data-source="post: 132327" data-attributes="member: 12691">Re: Service Question: getting AF and split prism focus screen to play &quot;nice&quot;OK, so you have 3 focus modes...1. Live viewNo mirrors are used and no setting up is required, just focus lens onto the sensor as it's seen in live view.2. Viewfinder, Manual focussing.The front mirror must be set so when the image is focused, you press the shutter. The mirror then raises and if the front mirror was set correctly, the same focussed image will now be on the sensor.3. Viewfinder Autofocus.The rear mirror must be set so when the image is in focus on the AF sensor, it gives the same focus to sensor plane when the mirror is lifted.<a href="http://photographylife.com/how-phase-detection-autofocus-works" target="_blank">&gt;&gt;CLICK HERE&lt;&lt;</a> for more information, and a picture that will help you understand the 3 focusing modes of your camera.The adjusters are 2mm allen grubs, inside the body, you can see them when the lens is removed and the mirror is raised.Best left to the professional if you don't know which is which or what way they need to be turned to correct back or front focussing issues.EDIT: Just noticed the page says the grub screws are 1.5mm, pretty sure mine was 2mm but not 100% certain.</blockquote>

[QUOTE="Rexer John, post: 132327, member: 12691"] [b]Re: Service Question: getting AF and split prism focus screen to play "nice"[/b] OK, so you have 3 focus modes... 1. Live view No mirrors are used and no setting up is required, just focus lens onto the sensor as it's seen in live view. 2. Viewfinder, Manual focussing. The front mirror must be set so when the image is focused, you press the shutter. The mirror then raises and if the front mirror was set correctly, the same focussed image will now be on the sensor. 3. Viewfinder Autofocus. The rear mirror must be set so when the image is in focus on the AF sensor, it gives the same focus to sensor plane when the mirror is lifted. [URL="http://photographylife.com/how-phase-detection-autofocus-works"]>>CLICK HERE<<[/URL] for more information, and a picture that will help you understand the 3 focusing modes of your camera. The adjusters are 2mm allen grubs, inside the body, you can see them when the lens is removed and the mirror is raised. Best left to the professional if you don't know which is which or what way they need to be turned to correct back or front focussing issues. EDIT: Just noticed the page says the grub screws are 1.5mm, pretty sure mine was 2mm but not 100% certain. [/QUOTE]

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