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Old 02-08-2020, 06:27 PM
Stefan Buda
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Grzybowski collimator

About 20 years ago I made a small alignment telescope with cross-hairs that can focus from a few inches to couple of metres. A few days ago I decided to turn it into a Grzybowski collimator, by adding the light sources and a 2" barrel to the front end.

Hopefully I will be able to use it to fix Andy01's TOA-130 problem.
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Old 02-08-2020, 07:04 PM
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Atmos (Colin)
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Looks a bit like one of those Hubble Star things.
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Old 02-08-2020, 07:45 PM
Stefan Buda
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No, this is an auto-collimator. It plugs into the eyepiece holder and looks at retro reflections from lens surfaces.
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Old 02-08-2020, 08:24 PM
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Ah! So it’s kinda like a Tak collimating scope on steroids
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Old Yesterday, 08:45 AM
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Sunfish (Ray)
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Very interesting device. I tried to make a collimating scope with an old lense but I could not sort out a light source. Is the placement of the led critical in relation to each other and the centre ?
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Old Yesterday, 10:23 AM
Stefan Buda
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Quote:
Originally Posted by Atmos View Post
Ah! So itís kinda like a Tak collimating scope on steroids
The Tak one is not very useful for refactors. With this one you can see the retro reflection from each air/glass interface.

Quote:
Originally Posted by Sunfish View Post
Very interesting device. I tried to make a collimating scope with an old lense but I could not sort out a light source. Is the placement of the led critical in relation to each other and the centre ?
Yes, the placement of the light sources need to be accurate and also the optical/mechanical axis of the whole device.
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Old Yesterday, 05:20 PM
sharpiel (Les)
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Quote:
Originally Posted by Stefan Buda View Post
About 20 years ago I made a small alignment telescope with cross-hairs that can focus from a few inches to couple of metres. A few days ago I decided to turn it into a Grzybowski collimator, by adding the light sources and a 2" barrel to the front end.

Hopefully I will be able to use it to fix Andy01's TOA-130 problem.
Hello Stefan. I see youíre still at the forefront of optical-engineering excellence. Is there a thread link to Andyís TOA problems? I have a TOA 130 also so want to be abreast of inherent issues...I havenít been on here much since December 2019.
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Old Yesterday, 08:33 PM
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Hi Les,

Nothing is seriously wrong with Andy's TOA. The objective appears to have a bit of a tilt and that prevents the flattener/corrector to work properly.

The rest of the problems were not from Tak hardware. The field rotator could not be locked in a way that would guarantee squareness and the focuser had a bit of a tilt too. Focuser tilt can be adjusted but only in one plane, which is not enough to get it perfect.

Other than that, he inherited a bunch of adaptors/extenders with wedge errors.
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Old Yesterday, 09:09 PM
sharpiel (Les)
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Ok. It's always been a fear of mine that one day misadventure would require re collimation of my TOA. Would your "Grzybowski collimator" in the hands of a reasonably handy intelligent person enable self re collimation in situ?
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