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Used Laser Collimation
Telescope collimation trouble?
Hello,
I'm new to astronomy and am confused on the collimation of my telescope(Orion classic 10")I understand how it is done but always used the collimation cap that came with my scope.I recently purchased a laser collimator from Hoitech linked below,
http://www.telescopes.com/telescope-acce…
When I collimated my telescope with it,then tried the collimation cap and found its collimation off-I'm not real sure on which one is correct.Its not off allot I have try'd to re adjust the collimation but one way or the other depending on what I use to check it its off.
Please can you help me?
Wally
There are a few points to bear in mind with a laser collimator.
The first is to ensure that the collimator is itself collimated. Not all collimators are adjustable (e.g. my Antares collimator has fixed collimation, but is is pretty much bang on) but if yours is you need to ensure it is accurate. The textbook way of doing this is to use a V-block but I have always been dubious of this: even if you have a suitable engineer's V-block handy there is no guarantee that the outside casing of the collimator is accurately machined. With some collimators this is visibly not the case. I prefer instead to use the scope to check its collimation: rack the focuser in all the way (so it is most rigid), drop the collimator in and tighten it up. Make a mental note of where the beam hits the primary. Rotate the collimator 180 degrees, tighten up again and make sure it is in the same place.
The second thing to check is that the centre marking ring on the secondary is actually in the optical centre of the mirror. Generally you can assume this is also the physical centre of the mirror. Pull out your mirror cell and carefully measure it with a ruler: on some scopes the ring can be several mm from the correct position.
Even if everything checks out it is possible for a laser collimator to give incorrect results. Lasers ensure that the primary and secondary mirrors have parallel optical axes. They do nothing to ensure that those axes are on one and the same line. Having said that, they are still at least an order of magnitude better than the typical collimation cap supplied with a scope: those are difficult even for the experienced to use accurately. As such I would trust the collimation given by your laser. A Cheshire eyepiece is the most accurate tool for collimation but is nowhere near as quick or as convenient to use.
Update: I'm not entirely sure where digquickly is coming from here. You need to remove the dust cover to collimate your scope: you can't see the spot on the secondary with it still in place. Indeed, once your scope is not wildly miscollimated the beam will never leave the front end of the scope anyway since the beam will travel back into the focuser from the secondary mirror.
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Orion LaserMate Pro Laser Collimation Kit $99.99 If you'd like a collimator that stands up to the rigors of real-life field astronomy, our new LaserMate Pro Heavy Duty collimation kit is for you. Even if you dropped it into your bag, don't worry. Did you accidentally bang it? No problem. This hardened design will guarantee the alignment of the collimating laser for a lifetime. Collimation is the process of the mechanical centering of your optics to give your telescope the best possible optical performance. If you own a Newtonian reflector (especially an assemble-on-site telescope) it needs to be checked every time you reassemble it. For tack-sharp images through some telescopes, you may even need to check alignment during your nighttime viewing session as well. With the LaserMate Pro, you'll get a lifetime of precise collimation so you'll enjoy the best possible visual and imaging experience to get the most out of your telescope. Achieve quick collimation with laser precision in a simple two-step process. First, insert the LaserMate Pro into a standard 1.25" eyepiece holder and adjust the secondary to center the red laser dot on the primary mirror. For 2" eyepiece holders, use a 1.25" to 2" expansion adaptor or Orion's Precision Centering Adapter for greatest accuracy. Then, use the included Cheshire eyepiece for final collimation by tilting the reflector's primary mirror. Illustrated instructions and centering dots are included. The LaserMate Pro is built of durable metal in gunmetal grey and has a lifetime guarantee! |
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Laser Projection by Busker, Matthias [Paperback] $114.71 Lasers are an interesting option as a light source for projection displays, because of their high directivity. As a result, a high brightness light source with a small beam profile, a good beam quality and good collimation characteristics is obtained. This allows the application of small light engines and display panels without loosing much intensity. As a result, a small and quite cheap projector can be gained. If the panel costs are still too high, laser sources can also be used to realize even cheaper architectures that use 1D display modules or a flying spot scanner. Additionally, the laser beam is highly monochromatic, so a projection unit using three primaries can cover a large colour gamut. The intention of this book is to give an overview on state of the art projection techniques, applicable laser sources and challenges in setting up micro or even high power laser front projection systems. Author: Busker, Matthias Binding Type: Paperback Number of Pages: 156 Publication Date: 2008/12/01 Language: English Dimensions: 9.00 x 6.00 x 0.33 inches |
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The Susi Beam Emittance Collimation Channel. $115.71 The Superconducting Source for Ions (SuSI) is a newly designed, fully superconducting Electron Cyclotron Resonance (ECR) ion source working at 14.5 and 18 GHz microwave frequencies at the National Superconducting Cyclotron Laboratory (NSCL). Preliminary results indicate that SuSI is capable of producing ion beam currents comparable to other 18 GHz sources 1]. In parallel to the increase in beam currents offered by SuSI compared to existing sources at the NSCL, a dedicated collimation channel has been designed to tailor the beam emittances to the K500 cyclotron acceptance, which is about 75 pimmamrad ?], so as tcy minimize the beam losses in the cyclotron extraction channel. The collimation channel uses four collimation stages and three solenoids in between to rotate the beam transversely in phase space. Beam simulations showed that the proposed design can efficiently collimate Learns from SuSI under various scenarios. The collimation channel was commissioned with SuSI in a test area in June 2009. Experimental results have confirmed the effective collimation capability observed in the beam simulations. The collimation channel anti SuSI were moved to the Coupled Cyclotron Facility (CCF) ECR. area in July 2009 in replacement of the former 6 GHz SuperConducting ECR ion source (SCECR). Since then the collimation channel has been recommissioned and provided adequate capability for emittance collimation and ECR parameter optimization at the CCF. Author: Zhang, Chi Binding Type: Paperback Number of Pages: 124 Publication Date: 2011/09/02 Language: English Dimensions: 9.69 x 7.44 x 0.26 inches |
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Orion LaserMate Deluxe Telescope Laser Collimator $69.99 With our LaserMate Deluxe you will get perfect alignment of your reflector's optics, and faster than with standard collimators. Precise collimation ensures that you'll enjoy the sharpest possible images. Using the LaserMate Deluxe is a simple one-step procedure. A new rear view port in the anodized aluminum housing lets you see both the emitted and return laser beam spots while standing at the rear of the telescope. Just tweak the scope's collimation screws until the beams overlap in the center of the LaserMate's target pattern. Done! Perfect collimation at lightening speed. Only 4" long, it's easy to stash in your accessory case. Ideal for Newtonians and a must for those with focal ratios of f/5 or lower. Fits any 1.25" eyepiece holder. Includes one CR2032 battery and instructions. One-year limited warranty. This Class IIIA laser product complies with US 21 CFR 1040.10 and 1040.11 |
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Collimation problems with telescope?
I collimated my 12" dobsonian using a Hotech laser collimator and a cheshire collimator and every time I move the telescope up and down it goes out of collimation. What is the reason for this happening and is there anyway to fix it? Any help is greatly appreciated.
Thank you
Also check the focuser. Is it flexing? I usually collimate at about 45 degree tilt as mentioned above with the focuser about a third of the way out. Make sure you don't over tighten the locking bolts on the primary, as this can also throw the collimation off a bit.
I always warn folks not to waste a lot of viewing time obsessing with "perfect" collimation.
Clear Skies
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