Page 6 of 9

Re: Advanced Newtonian Collimation Idea

PostPosted: Sun Jun 03, 2012 8:03 pm
by Malamuteboy
Dion wrote:I've had a go at using the mire de collimation and centering it on the outline of the focuser tube vignette and that seems to work too.


Yep .I've done that with mire de collimation, but the Sharpcap cross hairs a still way off the centre of the image. :rage:

Advanced Newtonian Collimation Idea

PostPosted: Sun Jun 03, 2012 11:09 pm
by teslar
Did again with mire d collimation alone had to tweak it again to get the laser good but checked again after and mdc still looks ok and Cheshire looks aligned so should be good to go if only the sky would clear :rage:


Sent from tapatalk

Re: Advanced Newtonian Collimation Idea

PostPosted: Sun Jun 24, 2012 4:13 am
by FlikR
do you think this method would work using a canon 1100D and live view? Using the reticle in BYE and mire de collimaiton??

Re: Advanced Newtonian Collimation Idea

PostPosted: Sun Jun 24, 2012 9:38 am
by Dion
All I can say is, it can't hurt to try it. ;)

Re: Advanced Newtonian Collimation Idea

PostPosted: Sun Jun 24, 2012 10:03 am
by FlikR
Ok, tried it, but need to attach lens, meaning ya gotta manually hold the camera at the focuser and in the middle, fairly easy as it is the same diameter as the end of the lens. Manual focus it and then take a snap shot using BYE. Then I used Al's reticle and the circle feature to see if the secondary was a circle. Mine seemed pretty good and without having a second person holding the camera with the live view playing while I made adjustments to the mirror, it could be difficult. Either way it did show me that my secondary (aligned with collimaiton cap only) was pretty damn good. When I finally get my hands on the bits and pieces I will do the secondary mod and do the full collimation, focuser included.

Thanks for the tut.

Re: Advanced Newtonian Collimation Idea

PostPosted: Sat Jul 07, 2012 6:17 pm
by Yosimitysam
Dion; thanks for the vid, it put me onto something I've been concerned about for years! Even though I've been using Nils (can't for the life of me remember his last name) 'barlowed' laser method, I have my grandmother's "square eye" and have thought I can see a bit of discrepancy in my secondary, but never knew how to make it perfectly aligned. Your vid will correct that! I do have one question: how do I get the mire de collimation to download to a shortcut on my desktop? (I have sucessfully loaded the Sharpcap.) It is downloaded to my downloads page, but when I right click on the folder it says nothing about 'send to shortcut'. I hate to admit it, but I'm not ultra computer literate yet. Can you help out with that? Thanks in advance, Jeff
BTW, is the Orion Starshoot USB cam compatable with Sharpcap? I believe it is an ASCOM type device, so therefore should be compatable(?) but I don't wish to burn anything up out of hand since funds are not unlimited. (LOL)

A bit later...I tried the Orion cam and it worked perfectly! So, that question answered. All I need now is to look up billetparts and ghonis sites. Later.

Re: Advanced Newtonian Collimation Idea

PostPosted: Sun Jul 08, 2012 1:24 am
by Dion
The mir de collimation isn't an installing program, it's an executable, so just drag the whole file onto your desktop and double click it to open it. Nils Olaf Carlin is the name you were thinking of ;)

Re: Advanced Newtonian Collimation Idea

PostPosted: Fri Apr 05, 2013 10:57 pm
by ricardo
Dion, first of all thanks for all the videos, really informative!!

I have the same scope, a 10" Quattro, and maybe you can give me a clue. Secondary Offset. Do you know if the secondary geometric center should be used, or shall I use the offset (I've marked the secondary on the offset point, 0,5 cms away from the geometric center) to align the secondary mirror ?

I've moved the secondary to match the focuser center with the offset point, but my images are near awful, with the left of the image with a mix of coma and defocus, and flat fields not centered (according to CCD Inspector Flat Field Analysis).

I've checked the focuser and it's ok, I've marked the focuser center opposite inside the tube, and all this are ok, but images are not good. By the way, rotating the CCD rotates the image problem.

I'm clueless, any tip/opinion/consideration is truly appreciated!

Best Regards!

Re: Advanced Newtonian Collimation Idea

PostPosted: Sat Apr 06, 2013 12:05 am
by graham72
Thanks Dion good tut
I did my 200p a few weeks back never had such good collimation and my views say it all :thumbsup: just used a laser before to do secondary and primary and was shocked when I viewed my secondary through my webcam just how out of alignment it was :shock:
Wasn't presented as a circle and set to far down the tube
With the secondary sorted a couple if goes between laser and webcam and I was all done :thumbsup:

Re: Advanced Newtonian Collimation Idea

PostPosted: Sat Apr 06, 2013 1:13 am
by Dion
I believe the offset is built in on the secondary of skywatchers news, but nontheless I've never added an offset to either my 200p or my quattro, but i do swear by the using a camera to align secondary under focuser, and i can also say that in many brand new reflectors, it isn't centered and usually needs a nudge down the tube.