This kit contains the [url=https://app.astrobin.com/equipment/explorer/accessory/472/]SD Flattener HD (4417002)[/url] and the [url=https://app.astrobin.com/equipment/explorer/accessory/473/]Reducer HD (4517002)[/url] used together to produce a net focal reduction of 0.77x - 0.79x. It is compatible with models SD81S, SD103S, and SD115S.