Hi everyone. I have found that very simple dew caps can be made from BEE HIVE corn syrup containers, 1 litre size, for the oberwerk 15 x70's probably no doubt for the 11 power also and as well for other brand name chinese binoculars. Simply have a sharp knife and cut them out as long as you want. Then fill the inside with black heavy paper leaving about an inch space inside for the dew cap to go over the objective. I covered the outside with you guessed it duct tape! I'm from Canada and therefore I don't know if this brand and size is available in the USA but it fits perfectly. Regards, and hopefully clear skies, Gary
Attached Image: