VintageBigBlue.org

 

Re: Polar alignment, DSC, clutches, etc.


Oct 14, 2000

 


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#623 Oct 14, 2000

Allen,



Thank you for posting that picture of the polar alignment scope in

the files section--it confirmed any doubts I had as to its proper

use. Why isn't it in the manual? For that matter, why are there no

pictures in the manual whatsoever? Would be helpful.



Group,



As a previous fork mounted user (U2K), I used my G-11 for the first

time the other night. Based on previous experiences with new

equipment, I didn't even get my CCD cameras out so I could try to get

used to this mount and DSC.



It was previously mentioned to have 2 paper widths between the gear

and the shaft--what if mine seems to have quite a bit more (like 5-

10)?



I found the RA smooth, but the DEC axis stiff even with the clutch

loose--why?



Are the CKS worth the money? After tightening the RA clutch I wonder

how sturdy the setup will be when I hang the cameras. Will it slip

without the CKS?



Using the DSC and doing a one star alignment it appeared only to work

properly if you choose SECOND star when you pick the one star. The

manual implied only select SECOND star if you had a german mount and

chose a star in the west. I chose a star very east. Do most of you

do a one star or two star alignment? With a one star alignment I got

the objects in a 26mm eyepiece FOV on my C8, but not centered enough

I'm guessing for CCD work.



I bought a Losmandy polar finder through Pocono from stock but it

might have been the last one--anyone interested give them a call.

I'm very impressed with the quality/machining of the mount and after

seeing the discussion on the CI-700 believe this is a winner. Take

care all.



Mike Chapa

members.aol.com/mjchapa/astroimaging/main.html



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#625 Oct 15, 2000

Using the DSC and doing a one star alignment it appeared only to

work > properly if you choose SECOND star when you pick the one star. The

> manual implied only select SECOND star if you had a german mount

and > chose a star in the west. I chose a star very east. Do most of

you > do a one star or two star alignment? With a one star alignment I

got > the objects in a 26mm eyepiece FOV on my C8, but not centered

enough > I'm guessing for CCD work.

I've been using one star alignment, with Losmandy encoders coupled to

a JMI SGT-MAX interface, for months. The software is Earth Centered

Universe. I find one star alignment works very well, although the

software asks you to set the scope to either 0 or 90 degrees

declination first. When I asked David Lane (the author of ECU) if

there was any merit in setting the scope manually to 0 degrees

declination, he said it formed part of the overall alignment and

would increase accuracy.



Maybe moving map software is easier to use - it's more intuitive than

a 'calculator' display, but I certainly find it works superbly with a

CCD for finding faint deep sky objects. The only down side is you

tend to loose your dark vision by viewing a laptop screen (even with

a dark filter over it). The scope is a 10" SCT, at either f6.3 or f4,

with a Starlight MX5 series CCD. I discarded the use of a flip mirror

and now use a home made pair of camera adapters that give me a par

focal eyepiece, SLR camera and CCD camera, all using Canon Ft bayonet

mounting. By re-aligning on a nearby star, I can place any deep sky

object on the MX5 every time (maybe not right in the centre, but at

least on the CCD). The G-11 mount is stable enough to swap these

items without moving the scope.



Details at www.astromag.co.uk



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