VintageBigBlue.org

 

RE: [Losmandy_users] Re: Polar alignment redux


Jul 8, 2002

 


----------------------------

#10872 Jul 8, 2002

I had a chance to work on my elaborate protocol for aligning the

mount and have come to a conclusion.



It doesn't work the way it ought to. Moreover, the reason I've ben

having good results lately is because Ed Joganic sent me some plastic

bushings that do a marvelous job of holding the polar scope steady

and getting it closer to its theoretical performance level.



I'm not sure why. But if the math guys had figured out a way, there

wouldn't be these elaborate T-point systems designed to reduce all

the sources of error.



I have a hunch that much of the problem lies in the nature of right

ascension. I suspect that the reason drift alignment works is

because drift alignment as a technique starts with the assumption

that you are workingon the celestial equator. That I think is key.

It is possible that two star gem alignment might work better if

objects on the equator are chosen, but I'm beginning to think there

is no easy solution here. Well actually the easy solution is Ed

Joganic's bushings. I've had pretty damn solid results with those.



regards,

Greg Nowell



----------------------------

#10874 Jul 8, 2002

--- In Losmandy_users@y..., "gnowellsct" gnowell@n...> wrote: > I had a chance to work on my elaborate protocol for aligning the

> mount and have come to a conclusion.

>

> It doesn't work the way it ought to. Moreover, the reason I've ben

> having good results lately is because Ed Joganic sent me some

> plastic

> bushings that do a marvelous job of holding the polar scope steady

> and getting it closer to its theoretical performance level.

>

> I'm not sure why. But if the math guys had figured out a way, there

> wouldn't be these elaborate T-point systems designed to reduce all

> the sources of error.

>

> I have a hunch that much of the problem lies in the nature of right

> ascension. I suspect that the reason drift alignment works is

> because drift alignment as a technique starts with the assumption

> that you are workingon the celestial equator. That I think is key.



Does this have to do with the refractive index being variable

throughout the sky?



The plastic washers sound like a winner, any chance of getting ahold

of some?





Tim > It is possible that two star gem alignment might work better if

> objects on the equator are chosen, but I'm beginning to think there

> is no easy solution here. Well actually the easy solution is Ed

> Joganic's bushings. I've had pretty damn solid results with those.

>

> regards,

> Greg Nowell



----------------------------

#10886 Jul 9, 2002

The plastic washers sound like a winner, any chance of getting ahold

> of some?



I agree. Is there any chance we could find out the source of these washers

and how we might obtain some of them?



Thanks!,



Scott



website: www.rsiphotos.com/

email: ireland@...



Contact Us
This Site's Privacy Policy
Google's privacy policies

S
e
n
i
o
r
T
u
b
e
.
o
r
g