What Diameter are you considering? For a 24" scope, I would say F4.5 for the sake of saving the foot higher up on the ladder I would need to go to look through the eyepiece. For any size under 16" I do not think that small a difference would matter much in the height, and certainly not much for the view. Lisa Zeigler www.johnstelescopes.com www.mirrorkits.com -----Original Message----- From: Debbie [mailto:astrodeb@earthlink.net] Sent: Tuesday, August 24, 2004 10:34 AM To: Utah Astronomy Subject: [Utah-astronomy] f/4.5 or f/5 I was wondering if people would rather have an f/4.5 or an f/5 dobsonian reflector. I've looked through both and can't see any major difference. The f/5 scope would be easier to collimate but the f/4.5 would be easier on my knees. What do you guys/gals think? Debbie _______________________________________________ Utah-Astronomy mailing list Utah-Astronomy@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Visit the Photo Gallery: http://www.utahastronomy.com