I just received the Nikonos 105 today and leave for a trip to Micronesia the end of the month. I have had experience with the Nikonos 103 and was curious if any users of the 105 can help with any "tricks" or suggestions on use of the 105 that may be different than I am accustomed to. Also, are you aware of whether the guide numbers are similar between the two. Thanks! Mike Decker