It'll make a difference when using a 31mm Nagler or a 41mm Panoptic or other EP's with similar field stops. If you use something like that most of the time then it could be worth it to you.
-------------------- John C
Urban Observatory Tele Vue Pronto
A&M/Astreya 76mm F/6 APO
TMB/LOMO 80mm F/7.5 APO
Tak FSQ-106N F/5 APO
Meade 152ED F/9 "APO"
Meade 178ED F/9 "APO"
Meade ETX-125AT
Tak CN-212 8" F/12 classical Cass/ F/4 Newt
Teeter 20" F/3.8 truss Newt w/ServoCat
LXD750, EM-200, CI-700
ST-10XME