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Equipment Discussions >> Reflectors

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mtb54703
professor emeritus
*****

Reged: 11/12/08

Loc: Eau Claire, WI
Re: Laser on primary moves as focuser racked in/out new [Re: mtb54703]
      #5715486 - 03/05/13 10:13 PM Attachment (6 downloads)

And lastly, the new focuser, collimator rotated 90 degrees again:

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mtb54703
professor emeritus
*****

Reged: 11/12/08

Loc: Eau Claire, WI
Re: Laser on primary moves as focuser racked in/out new [Re: mtb54703]
      #5715506 - 03/05/13 10:25 PM

Nothing appears loose on the old focuser, but something is certainly amiss.

I'll add that it doesn't appear to be gravity related. All these pictures were taken with the scope at 45 degrees. If I pointed the scope straight up I see the same movement along the same line on the template.

Also, when I racked the focuser in/out I did so slowly, as I did notice that if I hit the stop at either end of travel quickly the laser dot would jump (as Mike R noted), so when I took the picture I was careful to not introduce that effect.


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Starman1
Vendor (EyepiecesEtc.com)
*****

Reged: 06/24/03

Loc: Los Angeles
Re: Laser on primary moves as focuser racked in/out new [Re: mtb54703]
      #5715530 - 03/05/13 10:37 PM

This is fair proof the drawtube either:
a) has a bore not colinear with the exterior surface, or
b) has a travel not in-line with the focuser body.
I suspect A.


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nevy
professor emeritus
*****

Reged: 02/07/12

Loc: UK
Re: Laser on primary moves as focuser racked in/out new [Re: Starman1]
      #5715574 - 03/05/13 11:06 PM

Could it be that the flat on the draw tube isn't quite flat & uniform ? Mine did that and after I used a wetstone on it it cured the moving dot.

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mtb54703
professor emeritus
*****

Reged: 11/12/08

Loc: Eau Claire, WI
Re: Laser on primary moves as focuser racked in/out new [Re: mtb54703]
      #5716290 - 03/06/13 12:24 PM

After posting the pictures last night I also fired off an email with the same problem description/pictures to Starlight Instruments and asked what I needed to do to get the focuser back in shape.

They replied to send the focuser to them and they will adjust it and/or replace the drawtube if necessary under warranty.

More places should have super customer support/service like that!


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Jason D
Postmaster
*****

Reged: 10/21/06

Loc: California
Re: Laser on primary moves as focuser racked in/out new [Re: mtb54703]
      #5716298 - 03/06/13 12:27 PM

Quote:

More places should have super customer support/service like that!




I believe this is common with vendors in this hobby. The customer base is too small to risk a negative reputation.


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