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Your secondary mirror is little too high in the tube. You will need to lower it by loosening the central secondary mirror bolt then re-collimate.
BE CAREFUL!!!! If you loosen it too much then the secondary mirror could break loose and drop on the primary mirror. Hold the secondary mirror stalk while loosening it to avoid any accidental drops. In addition, have the tube in a horizontal position to keep the primary mirror safe from any accidental drops.
That dark crescent you see at the right edge of the secondary mirror as shown in your photo is actually the reflection of the inner wall of the tube in the area right above the focuser opening towards the tube opening.
Jason
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