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PRejto
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Reged: 02/11/07

Loc: Sydney, Australia
Mirror Lock and Collimation?
      #5654502 - 01/31/13 03:11 PM

Hello,
I'm new to CAT type scopes...I was testing my Meade 12" ACF with a camera for the first time last night. After getting near focus with the built in focuser I finished up focus with the Feather Touch focuser I have on the back. I took a few star field photos that I observed in CCDInspector and was quite pleased to have a flatter field than I expected (17% KAF8300), and quite good collimation. I then realized that I had not locked the mirror. After locking, and after refocusing, my results were appreciably worse....poor collimation and poor curve results 30-40%. I did not expect this kind of result, but perhaps this is normal behavior. I ran out of time/energy to attempt physical scope collimation after locking. Is this normal?

Thanks,
Peter


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Christopher EricksonModerator
Carpal Tunnel
*****

Reged: 05/08/06

Loc: Waikoloa Village, Hawaii
Re: Mirror Lock and Collimation? new [Re: PRejto]
      #5655083 - 01/31/13 09:09 PM

Check your collimation with the mirror lock off and again with the mirror lock on.

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PRejto
super member


Reged: 02/11/07

Loc: Sydney, Australia
Re: Mirror Lock and Collimation? new [Re: Christopher Erickson]
      #5655205 - 01/31/13 10:26 PM

Quote:

Check your collimation with the mirror lock off and again with the mirror lock on.




Thanks! Sure...I plan to do this. What I'm wondering is what other people observe. Do you see any change in collimation with the mirror lock on or off?

Peter


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Christopher EricksonModerator
Carpal Tunnel
*****

Reged: 05/08/06

Loc: Waikoloa Village, Hawaii
Re: Mirror Lock and Collimation? new [Re: PRejto]
      #5655370 - 02/01/13 12:05 AM

Quote:

Quote:

Check your collimation with the mirror lock off and again with the mirror lock on.




Thanks! Sure...I plan to do this. What I'm wondering is what other people observe. Do you see any change in collimation with the mirror lock on or off?

Peter




It would be normal to experience a small amount of change in collimation and pointing. However a whole-bunch of difference wouldn't be normal.


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Markigno
sage


Reged: 01/09/10

Re: Mirror Lock and Collimation? new [Re: PRejto]
      #5655672 - 02/01/13 07:12 AM

Quote:

What I'm wondering is what other people observe. Do you see any change in collimation with the mirror lock on or off?

Peter



No, the collimation is affected in very small part, or for nothing, after mirror lockup.
Marco


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