How good are the optics of the NP127 is compare to the tak 130 in planetary globular galaxies nebulas?
How good are the NP127is optics
Started by johnbatchler, 05/22/2011 11:37PM
Posted 05/22/2011 11:37PM
Opening Post
Posted 05/23/2011 01:19AM
#1
I've looked through a tak 130 up at Mt Pinos. It got the job done on planets, double stars, etc. But it didn't knock my socks off as I thought it might. I would expect an NP 127 to be very close in performance to the Tak 130 and there might be sample variation with both models. I actually saw a meade 4" ed apo owned by Jake Jacobson perform extraordinarily well on Jupiter. The contrast on the belts was phenomenal. In Jake's words, it was "crazy" on how well it performed. I'd agree with that...John Batchler said:
How good are the optics of the NP127 is compare to the tak 130 in planetary globular galaxies nebulas?
Posted 05/23/2011 02:35AM
#2
5" is pretty small to try to resolve globular clusters. I have an NP101 and the optics are very good, details look as good as anything on a given night of that size.
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Posted 05/23/2011 11:19PM
| Edited 05/24/2011 03:08AM
#3
I've looked in a couple of these NP127 where high power star testing reveals collimation problems such as coma. Apparently the front and back lens groups were not square to each other. Unfortunately NP127 are not readily adjusted by the end user. At least one other person has reported similar things:
http://www.excelsis.com/1.0/entry/televue-np127-12-543.html?PHPSESSID=5ac3119c52f72ba2866708e6f8668
What about collimation in the TOA130? Has anyone seen similar issues in the Tak TOA130 -- I have much less experience with those. The TOA does have user-adjustable collimation screws, so there might be some hope for the user to correct things, if needed.
The shorter focal length of the NP-127 (F/5.2 vs F/7.7 for TOA 130) will allow wider and brighter views at the low-power end. But this is probably useful only for very large star clusters (M45?) and large diffuse nebulae (Veil Nebula) and maybe one or two galaxies (M31). For planets, most star clusters, globulars, most galaxies, I would not expect the F-ratio difference to be important, as you can always go to longer or short eyepieces to get the same view.
http://www.excelsis.com/1.0/entry/televue-np127-12-543.html?PHPSESSID=5ac3119c52f72ba2866708e6f8668
What about collimation in the TOA130? Has anyone seen similar issues in the Tak TOA130 -- I have much less experience with those. The TOA does have user-adjustable collimation screws, so there might be some hope for the user to correct things, if needed.
The shorter focal length of the NP-127 (F/5.2 vs F/7.7 for TOA 130) will allow wider and brighter views at the low-power end. But this is probably useful only for very large star clusters (M45?) and large diffuse nebulae (Veil Nebula) and maybe one or two galaxies (M31). For planets, most star clusters, globulars, most galaxies, I would not expect the F-ratio difference to be important, as you can always go to longer or short eyepieces to get the same view.
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