Jump to content

Banner.jpg.b83b14cd4142fe10848741bb2a14c66b.jpg

Messed up collimation again

Anthony1979
 Share

Recommended Posts

Ciaran Meier

Ciaran Meier

Posted
Posted

Looks good to me and better lined up than my newt.  The real test is how it performs under the stars. My own test is to get onto a nice close double of similar mag,  about 3 to 4 arcseconds seperation and if I'm happy with that I leave it.  It's possible to get a bit carried away with collimation and chase perfection until the cows come home.  That's my opinion anyway 😀.

 

20200329_193856.jpg

  • Like 1
Link to comment
Share on other sites
Ciaran Meier

Ciaran Meier

Posted
Posted
7 minutes ago, Anthony1979 said:

Its stressed me out all day been at it since 1 this afternoon trying to get it perfect

Yup,  know what you mean 😐, been there and done that.  Next time you need to collimate it'll be a lot quicker and less stressful now that you've been through the process already. 

Link to comment
Share on other sites
JOC

JOC

Posted
Posted (edited)

This is the definitive and most recommended guide.  http://www.astro-baby.com/astrobaby/help/collimation-guide-newtonian-reflector/ it needs following to the letter doing absolutely everything even if it sounds odd.  You will see if you read to the end that sometimes the perfect collimation isn't an absolutely symmetrical picture of circles and vanes.

Given this fact I don't think you are far out.

Edited by JOC
Link to comment
Share on other sites
Peter Drew

Peter Drew

Posted
Posted

Looks good enough to me.  Other issues such as seeing conditions and cooling to ambient temperature of the optics will have far more effect on performance than collimation being a few % short of perfection.     😀

  • Like 3
  • Thanks 1
Link to comment
Share on other sites
Ally8446

Ally8446

Posted
Posted
3 hours ago, Anthony1979 said:

Is this good

DSC_0444.JPG

I'd say that's pretty Bob on. If one wanted to be really picky, the secondary could come down (as you look at the photo) just a smidge. But to be honest you wouldn't notice a great deal of difference. What focal length is your    ota ? If memory serves, it's F6. If that is the case, I'd leave the collimation as is. Just my opinion of course. I'm open to be corrected. 

Al. 

Link to comment
Share on other sites
Anthony1979

Anthony1979

Posted
  • Author
Posted

The scope is f/5

3 hours ago, Ally8446 said:

I'd say that's pretty Bob on. If one wanted to be really picky, the secondary could come down (as you look at the photo) just a smidge. But to be honest you wouldn't notice a great deal of difference. What focal length is your    ota ? If memory serves, it's F6. If that is the case, I'd leave the collimation as is. Just my opinion of course. I'm open to be corrected. 

Al. 

The telescope is f/5... How would i move the secondary down a bit

Link to comment
Share on other sites
Neil H

Neil H

Posted
Posted

That's look good to me as well , just check after its cooled down and just adjust as need are you using a Cheshire I had a skywatcher 150/750 F5 and with a laser it was always miles out so I got a Cheshire and also followed astro baby got is spot  then popped the laser in and it said the Collimation was miles out t did star test and it was spot on so laser went in the bin I find the Cheshire is a really great tool and easy to use 

Link to comment
Share on other sites
Ally8446

Ally8446

Posted
Posted

The secondary isn't precisely in the middle but as I said, it's as near as damn it to not matter. I'm purely visual as I suspect is Anthony, atm anyway. It's close enough to get really good views. I'd leave it as is. 

Clear skies to all. 

Link to comment
Share on other sites
wookie1965

wookie1965

Posted
Posted (edited)
12 minutes ago, Anthony1979 said:

I use for imaging.... Thats why im wondering if it needs to be perfect

If you read about the 150p as I have said there is a slight offset of the secondary because it is a F5 scope.

Here is another guide this may help better I have just found it.

 

https://www.dropbox.com/s/z101875limcuzjy/Newtonian Collimation.pptx?dl=0

Edited by wookie1965
  • Like 1
Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing

  • Recently Browsing   0 members

    • No registered users viewing this page.
×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. By using this site, you agree to our Terms of Use.