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Equipment Discussions >> Reflectors

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star chaser
member


Reged: 02/10/13

Collimation adjusting screws and lock screws new
      #5770739 - 04/01/13 12:39 PM

Hi everyone.
I have a Orion SkyQuest XT 10 Newtonian which is fantastic but I would like to do DSLR photography with it but I am unable to reach primary focus even with a low profile focus devise. I am however very close. I am within 1-2 mm. The next thing I would like to try is moving the primary mirror in but I have maxed that out and would like to find some longer screws both lock and adjusting screws. I think I only need to move it in a centimeter or two at the most. Does anyone know where I might find some other then searching out hardware stores? I have tried "Bob's Knobs" online but they do not offer screws for the Orion SkyQuest XT 10 (they say they are to close together). My concerns are:
1. Would I need to replace the springs also?
2.Do the screws have special threading

Any thoughts would be appreciated.

Thanks Victor


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Jason D
Postmaster
*****

Reged: 10/21/06

Loc: California
Re: Collimation adjusting screws and lock screws new [Re: star chaser]
      #5770802 - 04/01/13 01:16 PM

How are you planning to use your XT10 for astrophotography? That is, what kind of tracking do you have? do you have the XT10g version or the XT10+tracking_platform?

Here is a temporary idea:
Loosen and tighten appropriate spider vanes thumb knobs to move the secondary mirror as close as possible to the focuser. That will give you few millimeters room to bring the image to focus.

Jason


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wirenut
Pooh-Bah


Reged: 09/21/06

Loc: m'dale Pa
Re: Collimation adjusting screws and lock screws new [Re: Jason D]
      #5770912 - 04/01/13 02:18 PM

Lowes had replacement screws to hold my cell in tube, they were a common metric thread. So I'd think they'd have what you need too, take the screws with you to match threads. you'll want longer springs or you could add a spacer with the springs you have.

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star chaser
member


Reged: 02/10/13

Re: Collimation adjusting screws and lock screws new [Re: wirenut]
      #5771333 - 04/01/13 05:44 PM

Thanks the info is great.! My XT 10 can be mounted on an Atlas EQ which will be my tracking system.

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panhard
It's All Good
*****

Reged: 01/20/08

Loc: Markham Ontario Canada
Re: Collimation adjusting screws and lock screws [Re: star chaser]
      #5774302 - 04/02/13 10:15 PM

Victor how much weight will that mount handle?

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star chaser
member


Reged: 02/10/13

Re: Collimation adjusting screws and lock screws new [Re: panhard]
      #5821488 - 04/25/13 08:55 AM

Sorry for the lone delay, but to answer your question "how much weight can your mount handle?". Answer is about 40 lbs. I have an Orion Atlas EQ.

Victor


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panhard
It's All Good
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Reged: 01/20/08

Loc: Markham Ontario Canada
Re: Collimation adjusting screws and lock screws new [Re: star chaser]
      #5821560 - 04/25/13 09:19 AM

Victor that tube will probably be too heavy for that mount. For astro photography the mount should only be loaded to approx 50% of max. load. So therefore 20 lb. max. load on that mount.

Edited by panhard (04/25/13 09:29 AM)


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Jarrod
Pooh-Bah
*****

Reged: 01/20/13

Loc: SE USA
Re: Collimation adjusting screws and lock screws new [Re: panhard]
      #5821674 - 04/25/13 09:54 AM

User Jeff2011 has done this on his XT8. He told me that he referred to this guide to figure out what to do.

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csrlice12
Postmaster
*****

Reged: 05/22/12

Loc: Denver, CO
Re: Collimation adjusting screws and lock screws new [Re: Jarrod]
      #5821737 - 04/25/13 10:22 AM

Be sure to let us all know which way the wind is blowing.....A 10" newt/dob on a EQ mount is a terrible beast. Agree that you will get some shots, but probably not what you're expecting as that is a lot of weight for that mount. For AP, most use a smallish refractor/APO; while a large newt on an ADEQUATE mount will give you some great pics, this is not the way to begin.....

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dan777
scholastic sledgehammer
*****

Reged: 11/16/07

Loc: Indiana
Re: Collimation adjusting screws and lock screws new [Re: star chaser]
      #5823175 - 04/25/13 09:20 PM

Quote:

Does anyone know where I might find some other then searching out hardware stores? I have tried "Bob's Knobs" online but they do not offer screws for the Orion SkyQuest XT 10



These are the top two stores for fasteners. Both are online as well as having brick-and-mortar retail shops.
www.mcmaster.com
www.fastenal.com


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B. Cook
professor emeritus
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Reged: 10/18/10

Loc: No. California
Re: Collimation adjusting screws and lock screws new [Re: dan777]
      #5823291 - 04/25/13 10:36 PM

You might consider the Orion 8 in astrograph scope instead of the 10 inch. The 8 in astrograph only weighs in at 17.5 lbs compared to the 10in at 27.2 lbs. Shorter tube and a lot less load on that Atlas mount especially when you start adding photography equipment. I have the same mount and 10in newt and that's all I want to load on that mount. Any wind will drive your photo equip. on the 10 in crazy.
Something to think about. Thanks Bill


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star chaser
member


Reged: 02/10/13

Re: Collimation adjusting screws and lock screws new [Re: B. Cook]
      #5827564 - 04/28/13 12:27 AM

Thanks everyone great info!

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star chaser
member


Reged: 02/10/13

Re: Collimation adjusting screws and lock screws new [Re: star chaser]
      #5827565 - 04/28/13 12:29 AM

Thanks everyone great info!

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