The adapter doesn't fit the camera specifically. Most telescope adapters are T-adapters. The 1.25'' refers to the eyepiece barrel that it fits in, and that scope looks like it doesn't take any larger than 1.25'' eyepieces. To connect the camera you thread the T-adapter into a T-ring that fits in your camera's lens mount.

So I would get the 1.25'' adapter, then try to find a T-ring for your camera's lens mount, which should be easy as most camera and telescope stores supply them.

But skintigh is right, you'd have better results with a modified webcam for lunar and planetary. Some popular choices are the Phillips SPC900NC and TouCam, which you can find 1.25'' adapters for all over the astronomical market.

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