I am a finnish ds observer and ATM mirror maker since 1992. I joined this forum awhile ago and enjoy very much reading all stuff here. Hopefully i could be more active in observing during the next season just about to begin here very north of Europa.
My scope is nowadays an modified ServoCat driven Obsession 25" with a main mirror of my own, 490mm/19.3" f 6.52. The brand new 591mm/23.3" f 5.38 is not installed yet. As it may be understood I prefer the quality of image above all. After having observed briefly with two sub f4 scope(24"/42" they were great) i still think the longer the better. Seriously as mirror maker I will endeed go for sub f4 in order to be able to say i have done those
Thank you all to be able to join in this very intresting and inspiring forum!