The assailability and also availability of the conversion lens, however, I call as "poor". The conversion lens is almost impossible to buy in Germany. Pansonic itself is not to deliver the product in the situation. In very many mails with Panasonic always came only the message "please contact the dealer." But the dealer inter alia Amazon need to order the conversion lens with Panasonic and get seemingly only very small quantities. My order for a first dealer I need to cancel after many months. My second order with Amazon, also with a term of 5-6 months could not be served.
Therefore I can only recommend to anyone to buy the lens at the same time using the camera or respect at many retailers. Availability of to ask.