Here is my 10 inch f10 newt with a 1 inch diagonal , thats her in 2 pieces .
the Dobbo base , next to Goldie , and the top 1/2 , now you want to see Jupiter in this baby !!
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Dont knock the quality of a mirror Wulfgar , I made and figured both of these , along with their mountings ,
Go buy an 10 inch f/5 , it will give great views up to about 200x , thats where my 5 inch f/13 is just comming on song ..
Dont go here with my M210 ,,,
Brian .
Quote:
Originally Posted by wulfgar
It's long known standard. An F12 Newt with average optics can take on the best. That long focal length isn't as sensitive to optical faults as short focal lengths are. That's something fast Newtonian fans need to be aware of......................your F4 optics have to be good to work well. Any figure errors get multiplied by the fast optics. For that matter a similar rule applies to fast refractors.
Originally I used a 3/4 inch Royal secondary and a recessed eyepiece collar. But I got tired of Hex keying the eyepieces into the collar to change them, so I shifted the main mirror up an inch and put in the one inch secondary.
The downside of course is the step ladder required for Newtonian focal lengths over 50".
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