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  #41  
Old 15-12-2017, 11:44 PM
bigjoe (Joe)
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Quote:
Originally Posted by glend View Post
The GSO imaging newts, sold by Andrews as imaging newts, achieve camera focus easily. From memory, there is plenty of range there, however, you may need to use the supplied 35m extension to achieve focus visually with some EPs.
Thats true Glen ; had one of these very underrated 10" F/4 , definitely needs an extension..30mm to 50mm about for eyepieces.
bigjoe

Last edited by bigjoe; 15-12-2017 at 11:47 PM. Reason: Adding
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  #42  
Old 16-12-2017, 02:42 AM
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skysurfer
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Rather simple.

Pros of Refractor:
* crisper images due to lack of central obstruction (particularly ED / APO)
* allows lower magnification at same aperture for wide fields because f/ratio is usually lower (particularly ED / APO)
* no collimation duty which is even more difficult than a Newton / Dobson

Pros of SCT:
* More aperture for money
* More aperture for weight
* No color errors (CA) (while an APO also has negligible CA).

Make your choice.
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