I'm not really a beginner, but figured this would be the best place for this.
I currently own a N11 GPS, and I'm trading it in for a new 15.5" dob. I know that the straight-up light grasp calculation would be 11*11=121 and 15.5*15.5=~241 and 241/121=~1.99.
The new mirror will have and ultimate light grasp increase of nearly double, but shouldn’t I get further increases from a smaller central obstruction and fewer air/glass surfaces?
Am I on target? Would any of you be able to tell me about how much the perceived increase would be?
Thanks,
Dannon
I currently own a N11 GPS, and I'm trading it in for a new 15.5" dob. I know that the straight-up light grasp calculation would be 11*11=121 and 15.5*15.5=~241 and 241/121=~1.99.
The new mirror will have and ultimate light grasp increase of nearly double, but shouldn’t I get further increases from a smaller central obstruction and fewer air/glass surfaces?
Am I on target? Would any of you be able to tell me about how much the perceived increase would be?
Thanks,
Dannon