I bought this product mainly to protect my lens with an UV Filter. Turned out to be very useful, and very easy to install. Doesn't come with any instruction, and would say you donot need it. Although the viewfinder gets obstructed by the use of this conversion lens adapter, but pictures will be unaffected. Delivery by amazon was good but the super saver shipping takes quite a bit of time.
Canon LA-DC58H Conversion Lens Adapter for Canon G7 digital cameras, camcorders for sale