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Equipment Discussions >> Reflectors

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Jason D
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Reged: 10/21/06

Loc: California
Re: Concise thread about autocollimators+improveme new [Re: CatseyeMan]
      #3604162 - 02/04/10 10:53 AM

Quote:

... not quite - my 6" has that claim to fame.





Quote:

... just a technicality, Jason. You have the template "upside down" (unless you reversed the pic).




Because of the direction the template was rolled-in, I felt I was going to get little more puffiness at the center to keep the sticker away from the mirror while positioning it. So, I did what I did for a reason. However, in retrospect I don't think it really made much of a difference.

Jason


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Jason D
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Re: Concise thread about autocollimators+improveme new [Re: Jason D]
      #3607818 - 02/06/10 01:56 AM Attachment (144 downloads)

First installment of photos.

BLACKCAT Cheshire


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Jason D
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Reged: 10/21/06

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Re: Concise thread about autocollimators+improveme new [Re: Jason D]
      #3607820 - 02/06/10 01:57 AM Attachment (134 downloads)

INFINITY XLK offset pupil

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Jason D
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Re: Concise thread about autocollimators+improveme new [Re: Jason D]
      #3607825 - 02/06/10 01:58 AM Attachment (124 downloads)

INFINITY XLK central pupil

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Jason D
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Re: Concise thread about autocollimators+improveme new [Re: Jason D]
      #3607826 - 02/06/10 01:59 AM Attachment (132 downloads)

CDP via central pupil

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cheapersleeper
Carpal Tunnel
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Reged: 01/22/10

Loc: Sachse TX
Re: Concise thread about autocollimators+improveme new [Re: Jason D]
      #3607830 - 02/06/10 02:01 AM

Great thread but no longer concise.

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Jason D
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Re: Concise thread about autocollimators+improveme new [Re: Jason D]
      #3607852 - 02/06/10 02:34 AM

My first impressions:

Hotspot is definitely more accurate when using it with the cheshire. It has the best of both the donut and triangle center spot advantages.

Hotspot is definitely more accurate when using it for stacking P+2 reflections via the XLK offset pupil. Small shifts are easier to detect with the Hotspot shape compared to the triangle/donut shapes.

Hotspot wins again when it gets to stacking P+1 reflections since there is more perimeter to reference compared to both triangles and donuts spots

However, when it gets to CDP the triangle wins because a typical CDP view is already busy with reflections around P+3 and the large size of the Hotspot cluttered the view. But the Hospot wins over donut spots.

I like the yellow color because of its contrast against the cheshire ring but I felt successive reflections of the yellow color in the XLK where not as bright as the white color.

Above are first impressions. I am continuing with my evaluation.

Jason


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Jason D
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Re: Concise thread about autocollimators+improveme new [Re: Jason D]
      #3607875 - 02/06/10 03:04 AM Attachment (124 downloads)

Attachment shows how small and even smaller P+2 shifts can be easily detected with Hotspot

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Jason D
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Re: Concise thread about autocollimators+improveme new [Re: Jason D]
      #3607878 - 02/06/10 03:06 AM Attachment (145 downloads)

Attachment shows how little extra effort is needed to avoid pupil reflections and to clear the clutter around P+3 CDP with Hotspot. Right photo is a better CDP setup.


Edited by Jason D (02/06/10 10:53 AM)


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CatseyeMan
Vendor (Cats Eye Collimation)
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Reged: 12/16/04

Loc: Madison, AL USA
Re: Concise thread about autocollimators+improveme new [Re: Jason D]
      #3608058 - 02/06/10 08:25 AM

Jason,

As always - GREAT PICS! Once again ... another of your innovative concepts is now a reality!

Were these pics taken with just "room" lighting or did you have any supplemental source directed at the spot?


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CatseyeMan
Vendor (Cats Eye Collimation)
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Reged: 12/16/04

Loc: Madison, AL USA
Re: Concise thread about autocollimators+improveme new [Re: Jason D]
      #3608066 - 02/06/10 08:35 AM

Quote:

... Left photo is a better CDP setup.





Actually, I prefer the "Right" pic queues.


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Starman1
Vendor (EyepiecesEtc.com)
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Reged: 06/24/03

Loc: Los Angeles
Re: Concise thread about autocollimators+improveme new [Re: CatseyeMan]
      #3608274 - 02/06/10 10:45 AM

Do I understand correctly, though, that the diameter of the hotspot centermark has to be calibrated to the focal length of the scope to actually correspond well to the inside diameter of the central dark area in the cheshire?
If that's the case, then several different sizes of marker would be necessary.
Though the ability to find the focal point of the scope by matching sizes of reflected spots would seem to be a definite plus of this center mark.
The field could be a little "busy" if this mark were employed with the CAM modification, though.

Edited by Starman1 (02/06/10 10:46 AM)


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Jason D
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Re: Concise thread about autocollimators+improveme new [Re: CatseyeMan]
      #3608305 - 02/06/10 11:00 AM

Quote:

another of your innovative concepts is now a reality!



And thank you for encouraging innovation, Jim.

Quote:

Were these pics taken with just "room" lighting or did you have any supplemental source directed at the spot?



Just room lighting though the OTA was poiting close to a source light but not directly at it. As part of my continued evaluation I will use a diect light source (white and red) in the dark. Stay tuned.


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Jason D
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Re: Concise thread about autocollimators+improveme new [Re: CatseyeMan]
      #3608311 - 02/06/10 11:01 AM

Quote:

Actually, I prefer the "Right" pic queues.



I meant to say "right". I made the edit.


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Jason D
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Re: Concise thread about autocollimators+improveme new [Re: Starman1]
      #3608342 - 02/06/10 11:14 AM

Quote:

Do I understand correctly, though, that the diameter of the hotspot centermark has to be calibrated to the focal length of the scope to actually correspond well to the inside diameter of the central dark area in the cheshire?
If that's the case, then several different sizes of marker would be necessary.



No.
The Cheshire reflection's apparent size is one focal length away but located at infinity.
The Hotspot reflection's apparent size is one focal length away and located one focal length away.
Therefore, one Hotspot size will work for all scopes regardless of their focal lengths.
Think of it this way, if your thoughts are correct then Jim would have been selling different triangle sizes depending on your scope's focal length over the past years.


Quote:

Though the ability to find the focal point of the scope by matching sizes of reflected spots would seem to be a definite plus of this center mark.



I still need to evaluate this benefit. Stay tuned.

Quote:

The field could be a little "busy" if this mark were employed with the CAM modification, though.



Good point. My XLK+CAM is inaccessible to me at the moment. I will evaluate and post photos in few days. Stay tuned.

Jason


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Jason D
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Reged: 10/21/06

Loc: California
Re: Concise thread about autocollimators+improveme new [Re: Jason D]
      #3608377 - 02/06/10 11:35 AM Attachment (117 downloads)

You can see how my old center spot placement by the factory was off by around 1.5mm. If you purchased quality collimation tools but have no plans to replace the center spot, at least check the placement of the existing spot. In my case, my original stock mirror center spot placement would have introduced 0.75mm PAE.

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Starman1
Vendor (EyepiecesEtc.com)
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Reged: 06/24/03

Loc: Los Angeles
Re: Concise thread about autocollimators+improveme new [Re: Jason D]
      #3608405 - 02/06/10 11:55 AM

Jason,
Jim HAS offered triangles of different sizes, and does recommend different triangle sizes based on focal length.


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CatseyeMan
Vendor (Cats Eye Collimation)
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Reged: 12/16/04

Loc: Madison, AL USA
Re: Concise thread about autocollimators+improveme new [Re: Starman1]
      #3608437 - 02/06/10 12:12 PM

Quote:

Jason,
Jim HAS offered triangles of different sizes, and does recommend different triangle sizes based on focal length.




Don,

Half of what you said is true. I do offer a "smaller" triangles for the 1.25" Cheshire (smaller ring ID). The "larger" triangles are for the 2" Cheshire tools (BLACKCAT & TELECAT). In each case, they are all the same triangle size (only 2 sizes offered) with varying hole perforation size (or solid) options.


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Jason D
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Reged: 10/21/06

Loc: California
Re: Concise thread about autocollimators+improveme new [Re: Starman1]
      #3608450 - 02/06/10 12:17 PM

Quote:

Jason,
Jim HAS offered triangles of different sizes, and does recommend different triangle sizes based on focal length.




I thought Jim offered different perforation sizes which is different from what we are talking about.

The different triangle sizes are for different focuser sizes -- not different focal lengths.

http://www.catseyecollimation.com/spotsbig.jpg

Jim, please clarify.


EDIT: I just noticed that Jim has responded while I was working on this reply

Edited by Jason D (02/06/10 01:01 PM)


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Jason D
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Loc: California
Re: Concise thread about autocollimators+improveme new [Re: Jason D]
      #3609696 - 02/07/10 12:10 AM Attachment (145 downloads)

Attached is an animation showing how P+2 stacking is more accurate with the HotSpot compared to the triangle.
Note how it is easier to discern the unstacking of P+2 using the Hospot compared to the triangle spot even though both are shifted by the same amount.


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