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Kenneth Novak books; Still solid information?

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#1 Davey 8V71

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Posted 14 October 2019 - 08:03 PM

Kenneth Novak put out a couple books that I am aware of. "Newtonian Notes" by Peter Francis, and "Cassegrain Notes" by Kenneth Novak himself. Yes, I understand the information is "older", and things are often done differently now. My question is this; As far as those familiar with the books are concerned, is the information contained in the two books accurate, and correct??



#2 John Fitzgerald

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Posted 14 October 2019 - 08:07 PM

I have "Newtonian Notes", and the information is still relevant, though dated.   I built a complete 8" f/8.6 Newtonian back in the late 1980's using that pamphlet as a guide on placement, sizing of the secondary, collimation, etc.


Edited by John Fitzgerald, 14 October 2019 - 08:07 PM.

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#3 macdonjh

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Posted 15 October 2019 - 08:13 AM

Seems to me the optics part can't really go out of date.  Construction techniques have changed over the years, though.



#4 Oregon-raybender

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Posted 17 October 2019 - 11:57 AM

Well we still make Newtonians, get much older than that, or even better simple lens scopes. I guess

optics has not changed much. gramps.gif  Now materials and such yes, but we still grind and polish with rocks!

 

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#5 Davey 8V71

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Posted 17 October 2019 - 07:51 PM

Thanks for the replies so far. I appreciate the input.

 

Tucked in the section covering Selecting Diagonal Size and Offsetting A diagonal in my copy of Newtonian Notes, I have some notes from Telescope Making #39 Winter 1989 / 90. The math formulas from TM #39 look quite a bit more involved than the ones in Newtonian Notes. I don't know that more involved math is always better, but I hope some refinement had occurred from 1976, the first printing of Newtonian Notes, and 1989 when TM printed their equations for the same.

 

  And so goes progress...



#6 JohnH

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Posted 18 October 2019 - 03:16 PM

Most of it was Cassegrain/Newtonian designs




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