Canono EOS 1N: Possible to adjust focus?

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jseffel

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My EOS 1N backfocuses with all my lenses, my EOS 6D frontfocuses with the same lenses. Is it possible to adjust this by loosening / tightening something in the camera or is software related? Canon does not service the 1N and I am afraid that sending away the lenses might give even more problems on the 1N as the 6D frontfocuses. My theory is that the 6D is more correct than the 1N and if the lenses are actually frontfocusing my backfocus problem on the 1N will be even worse.
 

benjiboy

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I suggest you look on YouTube there are several videos that show you how to do this.
 
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jseffel

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I suggest you look on YouTube there are several videos that show you how to do this.
I have failed to find any, unless you mean videos about adjusting the 6D... I want to adjust the 1N.
 

neilt3

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Try downloading a copy of the service manual .
I don't know about the 1n , but on some cameras the position of the AF module can be adjusted by three screws on the base plate hidden by a sticker .


Obviously it will effect all lenses the same way , so as long as all your lenses are back focussing , that won't be a problem .
If your camera can be adjusted this way , be sure to be methodical .
Put masking tape on the base plate and mark the start point if each screw so you can reset to where you started if things don't work out .
Likewise , each screw should be turned exactly the same , otherwise will be different on one side of the frame than the other .

On some Nikon cameras their is a lobed cam in the mirror box you adjust The position of the mirror until what you see in the viewfinder matches up with the AF unit and resulting picture .
Though I'm not sure if this was just their early DSLRs or film cameras as well , and I don't think Canon did it this way anyway .

Just a couple if things for you too look further into before you attempt anything yourself .
Would an independent service centre not calibrate your camera to your lens ?
As long as your. Lear you don't want any adjustment done to your lens , it would effect the focus on the DSLR .
If all lenses are consistently off , you would probably only need to send it off with one lens to get to go us correctly .

The cameras I've adjusted myself are DSLRs I've converted for myself and others to infrared , and these have all been adjusted like this fine .
I couldn't say if the type of AF units in yours was the same as were carried over from film cameras to digital , but someone here that services cameras should know .
Also , adjustments made by the hardware method is less precise than adjustments made via software . But at least it's a DIY method .
 
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film_man

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My EOS 1N backfocuses with all my lenses, my EOS 6D frontfocuses with the same lenses. Is it possible to adjust this by loosening / tightening something in the camera or is software related? Canon does not service the 1N and I am afraid that sending away the lenses might give even more problems on the 1N as the 6D frontfocuses. My theory is that the 6D is more correct than the 1N and if the lenses are actually frontfocusing my backfocus problem on the 1N will be even worse.

No you can't do anything yourself. Maybe the mirror is slightly out of alignment, the AF sensor is behind it. Is focus ok if you focus manually? If it looks ok on the finder and still is backfocused then it is likely the mirror out of position, a service should fix it (though not sure who services the 1N any more but at least that's a mechanical issue).
 
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