Having problems with your Canon EOS 400D / Rebel XTi Digital Camera ?

Canon 400d constant backfocus

\015 Focus is too long with 3 cm at 90cm ,\302\240with\302\240any\302\240of\302\240autofocus\302\240points\302\240selected;\302\240setting\302\240that\302\240exclude\302\240false\302\240focus\302\240(\302\240just\302\240a\302\240relatively\302\240small\302\240-but\302\240thick-\302\240cross,\302\240on\302\240gray\302\240background). Very bad for Canon EF 85mm f1.8 with depth of field of 0.5 cm in this situation. I suspect light having to travel diferent distances to CMOS / autofocus sensors.\302\240Same,\302\240but\302\240less\302\240noticeable\302\240with\302\240EFS\302\24018-55mm. How can i increase the lenght that light travel to autofocus sensors? Thanks for your time!\302\240Romania\015

Answers :

Backfocus problems will be magnified when using wide aperture lens with shallow depth of field, nice lens btw. Camera's adjustments for manual and autofocus are inside mirror cage behind mirror, and you dont want to risk getting dust on sensor or damaging sensor. Qualified camera repair shop or sending to canon for adjustment would be my suggestion.
Repair Help & Product Troubleshooting for Canon EOS 400D / Rebel XTi Digital Camera

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Canon 400d constant backfocus


Backfocus problems will be magnified when using wide aperture lens with shallow depth of field, nice lens btw. Camera's adjustments for manual and autofocus are inside mirror cage behind mirror, and you dont want to risk getting dust on sensor or dam ... Canon EOS 400D / Rebel XTi Digital Camera

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On my Canon 400D I can't select the AF point I want. (I'm trying to select the middle point). In P TV and AV and Manual it seems to randomly select a point and I cannot control the focus point as, when the AF button is pressed, it doesn't come up on the screen. (Whereas other 400D cameras work OK) My camera seems to be missing this important function.


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