Sergey_H, XDA forum member has came up with an app which can increase the level of satisfaction that you gain from the default camera app of your HTC HD2 WP7 device. SHCameraApp is fun app for Windows Phone 7 which able to get auto-focus feature. This software is suitable for HD2 WP7.
* Resolution from 320×240 up to 5MP
* Auto-focus enable/disable
* Image preview
* Flash settings (auto, on , off, red eye correction)
* Save settings
* Video recording
* On/off for vibration
* Focus on screen tap
For more details and information about the application, please visit at XDA Forum thread. Also, you can find the download link over there, as the app currently not available in the MarketPlace.