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  • Seben Laser Collimator to align telescopes LK1 31.7mm (1.25")
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Seben Laser Collimator to align telescopes LK1 31.7mm (1.25")

by Seben
| 3 answered questions

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2 new from £23.49
  • Quickly and precisely align your Newtonian reflector telescope
  • 31.7mm (1.25") thread
  • Metal housing

Product details

  • Boxed-product Weight: 100 g
  • Item model number: tls_acc_lk1
  • ASIN: B006FGYWM0
  • Date first available at Amazon.co.uk: 28 Nov. 2011
  • Average Customer Review: 4.5 out of 5 stars  See all reviews (181 customer reviews)
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Product Description

Seben Laser Collimator to align telescopes LK1 31.7mm (1.25")

This solid high precision metal laser collimator allows you to quickly and precisely align your Newtonian reflector telescope.

The handling is very easy. All you have to do is fit the laser collimator into the 1.25" focuser. This allows you to check if the mirrors are well aligned.

The laser collimator can be aligned itself, too. But that is usually not necessary, as it will be delivered well aligned.

It uses a common CR2032 3V lithium battery.

Contents of delivery:
1x Laser Collimator incl. battery


Customer Questions & Answers

Customer Reviews

4.5 out of 5 stars

Most Helpful Customer Reviews

18 of 18 people found the following review helpful By Paul on 10 May 2013
Verified Purchase
OK, I'm seriously impressed with this. It's so easy to use, my telescope was properly and accurately collimated within about 10 minutes!

It's very well made. It feels solid, and not at all flimsy.

As other reviewers have recommended, I first checked the collimation of the collimator, in my case by placing it on a windowsill against the window frame, turning it on and gently turning it. No problems, it was delivered properly collimated, and the little red dot stayed stationery as I rotated it.

I next put it into the eyepiece holder on my telescope. As another reviewer said, it's very helpful if the centre spot of your primary mirror is marked, and I was pleased to see a very small circle at the centre point of my (Skywatcher) telescope's primary. The red dot from the collimator was way off, at least a centimetre, so I then adjusted the angle of the secondary mirror to centre the dot onto the primary.

I then moved to adjust the primary. As you can see from the pictures, the collimator has a cut away in the side, with a 'target' fitted in. You can turn the collimator in the eyepiece holder so you can see this target when you're up at the back end of the telescope. The red dot reflected back from the primary was a little off centre in my case, so I had to adjust the primary mirror to centre the reflection on the collimator target.

And that's it. My telescope is collimated, and I can check it whenever I need - certainly whenever I transport my telescope!

A very worthwhile purchase. I'd strongly recommend it to anyone with a reflector telescope.
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10 of 10 people found the following review helpful By S. J. Kirk on 22 Mar. 2013
Verified Purchase
Very solidly built and robust piece of kit. Feels like it will last many a year so very impressed from that angle. However, a star knocked off since mine was not accurately enough collimated. From a distance of three meters the laser spot was prescribing a circle of about two inches radius on the wall. That is not accurate enough to collimate your scope properly and as such is disappointing. Fortunately it is a simple enough matter to collimate your laser collimator in half an hour or so if you know what you are doing and there are plenty of guides on the web to show you how. The three adjustment grub screws (Allen key required) are covered in sealant but just press your allen key through this sealant to get to the grub screws underneath.

You really should know how to collimate a laser collimator anyway and should check it every few months so for that reason only one star knocked off instead of two.
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8 of 8 people found the following review helpful By umhlope on 30 July 2013
Verified Purchase
Aligning a reflector telescope is a challenging job and can leave you with doubts as to whether it is absolutely right. This simple piece of kit will remove that doubt. With a centre marked primary mirror, it is very easy to set up your secondary mirror. My Seben laser collimator arrived perfectly adjusted ( I checked it by rolling it in a V block!)and within minutes I was satisfied with the telescope alignment. It is orders of magnitude better than a Cheshire alignment tool. This is £20 very well spent and by the way it was the cheapest one advertised on Amazon. It is a robust and well made instrument and I am happy to give it the full five!!
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5 of 5 people found the following review helpful By M. J. Holroyd on 9 Mar. 2013
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I was told by someone knowledgeable about amateur astronomy and telescopes that these kind of collimators are worse than useless (not just this product, but all of this kind). He said the problem lies with the fact is doesn't sit centrally at the optical axis in the focus tube/eye-piece adaptor. Not only can you wiggle it about in the focus tube (you see the laser dot dance all over the primary mirror) but once you have tightened up the grub screws and clamp it in place, this pushes the collimator against the side of the focus tube/eye-piece adaptor and hence away from the optical axis.

Maybe so, said a guy in a telescope shop in Stockport, but this is as accurate as you can expect to get it. Indeed, the way to check whether a telescope needs collimating is to de-focus on a star and look at its Airy disc. If the shadow of the secondary mirror isn't central in the Airy disc then it needs collimating. I checked this on mine and yes, the shadow was offset quite some way. So I bought this product anyway because of all the great reviews and followed a YouTube tutorial. The shadow of the secondary mirror is now central on the Airy disc, showing that it is nicely collimated.

Indeed, I have been trying to take webcam photos of Jupiter (I'm a beginner at all of this). I managed to get a hazy-looking picture showing two of its main cloud belts. After collimation: well, the photo wasn't great (but that was down to capture-software issues) but this time I saw more detail on the planet's surface. Okay, the seeing conditions may have been batter that day, and I might have focussed the 'scope better, but I reckon that this collimator did its job.

I found that the collimator itself didn't need collimating.
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20 of 21 people found the following review helpful By Ronny on 15 Jun. 2012
Verified Purchase
I thought that with this being one of the cheaper collimators on the market I was a little doubtful as I clicked "confirm your order." I need not have worried in the slightest. I switched it on, popped it into my focusser and instantly saw how badly aligned my Dobsonian was. I decided to take my primary mirror out and mark the centre with a permanent marker. (I would advise this as you really need to have a centre point.) From there I was able to adjust my secondary to hit the centre exactly and then adjust the primary mirror so that it hit dead centre of the focusser. The beauty about this product is that you can see where the laser hits the focusser from the bottom of the scope as you adjust making it a one person job. All in all, about a half hour for the first collimation and now it's a simple 5 minute or less job to fine tune each time I transport my Dob.

I would recommend this product.
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