Hi Lee
I didn't stuff around with those el-cheapo FR's, I went straight to a William Optics model. I havn't used it photographically yet but Paul, 1 Ponders, has and it appears to do an excellent job, I will get around to using it if I can ever get any decent weather.
http://www.williamoptics.com/accesso...r_features.htm
I just steer away from the cheap ones.
Cheers