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I am using 450d. When using a-def,m,av,tv,p mode, the shutter does not work properly. After pressing the shutter button, you have to press it again to lower the shutter. Do you have a solution? Also, AF is not possible when using the above mode.

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Your camera has “Mirror Lockup” enabled. You need to go into the Custom Function menu and disable CF III-9.

Here is a link to a short video that describes this in more detail.

Canon XSi/EOS 450D: Mirror Lockup

enter image description here

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  • \$\begingroup\$ Thank you so much \$\endgroup\$
    – Kostk
    Jun 7, 2023 at 3:23

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