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Used Kendrick's Laser Collimator for an SCT?



 
 
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  #1  
Old May 3rd 04, 12:33 AM
Dan Wenz
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Default Used Kendrick's Laser Collimator for an SCT?

Has anyone read Kendrick's comments re. the laser collimator as used for
an sct at the url below?

http://kendrick-ai.com/astro/misconceptions.html

I've read pros and cons in the past comparing the laser collimator vs. a
star test and still like the idea of a test I can use on cloudy days, or
just because it's "there"!

  #2  
Old May 3rd 04, 11:31 AM
Jon Isaacs
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Default Used Kendrick's Laser Collimator for an SCT?

I've read pros and cons in the past comparing the laser collimator vs. a
star test and still like the idea of a test I can use on cloudy days, or
just because it's "there"!


I read the thing. I am not a pro at SCT collimation.

However I was not impressed with the discussion. Anytime I hear the claim
that anything other than the star test can give the best collimation for any
scope, I am dubious.

Wonder what Uncle Rod had to say....

jon
  #3  
Old May 3rd 04, 01:34 PM
Dan Wenz
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Default Used Kendrick's Laser Collimator for an SCT?

Jon Isaacs wrote:

I read the thing. I am not a pro at SCT collimation.

However I was not impressed with the discussion. Anytime I hear the claim
that anything other than the star test can give the best collimation for any
scope, I am dubious.

Wonder what Uncle Rod had to say....

I'll just wait and see :-)

  #4  
Old May 3rd 04, 09:45 PM
Ray Porter
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Default Used Kendrick's Laser Collimator for an SCT?


"Jon Isaacs" wrote in message
...
Wonder what Uncle Rod had to say....

jon


Uncle Rod, as he's stated here before, prefers the star test.

However, I've owned a couple of the Kendrick SCT collimators and they
perform pretty much exactly as indicated in the documentation on the
Kendrick site. I'm not sure about the 5 times greater accuracy claimed by
Kendrick but they are at least as accurate as a star test as long as you
follow the directions precisely.

I don't own one of these now. I've sold both the ones I owned to fund other
projects. My scope doesn't need collimating very often since I almost never
move it. I will most likely buy one of these again at some point in the
future if I have the extra cash lying around.

Ray Porter


  #5  
Old May 3rd 04, 11:33 PM
Dan Wenz
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Default Used Kendrick's Laser Collimator for an SCT?

Ray Porter wrote:

However, I've owned a couple of the Kendrick SCT collimators and they
perform pretty much exactly as indicated in the documentation on the
Kendrick site. I'm not sure about the 5 times greater accuracy claimed by
Kendrick but they are at least as accurate as a star test as long as you
follow the directions precisely.


etc.

Thanks! Actually, a secondary reason for using a laser collimator is the
knowledge that, at age 70 time is rapidly moving along, and he/she who
dies with the most toys wins ;-

  #6  
Old May 4th 04, 07:12 AM
Chotechai
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Default Used Kendrick's Laser Collimator for an SCT?

I've owned C8 for ten years without need for collimation due to the
round star test in and out of focus.

One day my friend shows me his laser collimator and make me interested
in testing with this equipment. After inserting the collimator without
diagonal, I found that the laser dot did not center which meaned I
need to adjust my secondary mirror. After making the adjustment and
make the laser dot center, I found that the image get noticeable worse
than before!

Eventually, I have to adjust the secondary mirror without the
collimator and use only star test method; and be able to make the
image tack sharp again.

I am also able to collimate my friend newly bought C9.25 without the
collimator within 20 minutes, even with my 2nd time experience.

The lesson is, I don't need collimator and the chance of need to
re-collimate is very low.

Chote

Dan Wenz wrote in message ...
Has anyone read Kendrick's comments re. the laser collimator as used for
an sct at the url below?

http://kendrick-ai.com/astro/misconceptions.html

I've read pros and cons in the past comparing the laser collimator vs. a
star test and still like the idea of a test I can use on cloudy days, or
just because it's "there"!

  #8  
Old May 4th 04, 09:19 PM
Ray Porter
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Default Used Kendrick's Laser Collimator for an SCT?


"Chotechai" wrote in message
om...

The lesson is, I don't need collimator and the chance of need to
re-collimate is very low.

Chote


A good point but you apparently didn't look at the instructions on the
Kendrick web site. If you use a laser collimator on an SCT in the same
manner you would with a Newtonian, you will most likely badly decollimate
your scope. Check out the Kendrick site if you're interested in the correct
way to collimate an SCT with a laser.

As to your point, the fact that my scope almost never needs collimation
since I don't move it very often, is why I've sold my Kendrick laser.
However, I may buy another in the future once some other projects are
finished. It's handy to be able to achieve a really good collimation when
the weather doesn't allow a good star collimation.

Ray Porter


  #9  
Old December 5th 17, 04:38 AM posted to sci.astro.amateur
[email protected]
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Posts: 1
Default Used Kendrick's Laser Collimator for an SCT?

Hi, my name is Stanley.. I have a Newtonian telescope 150/750 which needs to be collimated,i was wondering if anyone has a laser collimator so I could come over and get it collimated... I stay near bannaswadi Bangalore. Thanks...
Mob:9741862056
 




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