I’m going to see if I can get a few pre and post SLC and EL’s and play around a bit. This thread has made me curious. Not having the newer EL version on hand at the moment , when you say the focuser might np e slower on the post short focus models , are you saying there are more revolutions from close focus to infinity? I would’ve thought the opposite. I’m also curious to see if there is a focus ratio difference, meaning a larger focus travel from close to 30 feet, and from 30 feet to infinity. I can’t say It was something I noticed when using different versions. My thinking was the only difference would be in travel from close to 30 feet, from there everything being the same.