I have been using the FZ38 with LA3 Adaptor and 1.7 T/Conv and have had some great results.On seeing the new FZ45/100 was thinking of upgrading,so did a bit of enquiring,only to find that the thread size on the body has been reduced to from 55mm on the FZ38 to 52mm on the FZ45/100.This makes the LA3 Adaptor and T/con unusable.Having spoken to Panasonic they say there are no plans to produce a reducer ring,which basically means if I upgrade to the 45/100 my adaptor and lens will become redundant.As these attachments cost in excess of £130 I,m now having second thoughts about upgrading.I,m can,t be the only person using these accessories,so would be interested to hear from anyone who can offer any advice.