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Old 10-08-2019, 06:37 PM
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Bobbyoutback
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Hi ,
Like to get one of these books , what one would you recommend ?

1. Adjustment & Testing of Telescope Objectives
By : Harold Dennis Taylor

2. Star Testing Astronomical Telescopes
By : Harold Richard Suiter

Or maybe I should get both depending on cost .

Bobby
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Old 11-08-2019, 07:16 PM
Saturnine (Jeff)
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Hi Bobby
Depends what you need the books for but if wanting to evaluate the optics in your telescope(s) and how to fix any issues that may be noted with the help of the book then Suiters book Star Testing Astronomical Telescopes is comprehensive in detail. Am not familiar with the other book but assume it would be quite suitable as well.
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Old 11-08-2019, 11:25 PM
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Quote:
Originally Posted by Saturnine View Post
Hi Bobby
Depends what you need the books for but if wanting to evaluate the optics in your telescope(s) and how to fix any issues that may be noted with the help of the book then Suiters book Star Testing Astronomical Telescopes is comprehensive in detail. Am not familiar with the other book but assume it would be quite suitable as well.

Thanks for your thoughts , if I get the Suiter book I'll need to make or buy an artificial star for ease of use

Cheers
Bobby
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Old 11-08-2019, 11:35 PM
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Ukastronomer (Jeremy)
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I don't want to stop you spending money but I prefer FREE books.

Have you googled what you want to "do" and FREE PDF download
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Old 11-08-2019, 11:41 PM
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Hi Jeremy ,
There is something about real books I like ' hence I've run out of book shelf room .
But thanks for the advice

Bobby .
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Old 12-08-2019, 08:27 AM
Saturnine (Jeff)
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An artificial star will help rather than star testing at night and have to mount on an EQ but what is the problem in the first place that you are trying to diagnose.
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Old 12-08-2019, 01:11 PM
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Quote:
Originally Posted by Saturnine View Post
An artificial star will help rather than star testing at night and have to mount on an EQ but what is the problem in the first place that you are trying to diagnose.
The reason for an artificial star is as you alluded to' is ease of testing , I want
to tweak my scopes for best collimation .

Cheers
Bobby
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Old 13-08-2019, 09:02 AM
Sunfish (Ray)
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I have used a shiny round christmas tree ornament on a film canister in my yard , reflecting the sun, for rough collimation after a reassembly on an SCT during the day.

I have also tried a pin hole in a film canister with bright light inside or beaming a laser measure through an eyepiece at a target. The shiny ornament worked more easily.

For complete collimation however, a star at night gives the best results if you donít happen to have a Hotech laser collimator.

Quote:
Originally Posted by Bobbyoutback View Post
The reason for an artificial star is as you alluded to' is ease of testing , I want
to tweak my scopes for best collimation .

Cheers
Bobby
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Old 13-08-2019, 04:11 PM
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Quote:
Originally Posted by Sunfish View Post
I have used a shiny round christmas tree ornament on a film canister in my yard , reflecting the sun, for rough collimation after a reassembly on an SCT during the day.

I have also tried a pin hole in a film canister with bright light inside or beaming a laser measure through an eyepiece at a target. The shiny ornament worked more easily.

For complete collimation however, a star at night gives the best results if you donít happen to have a Hotech laser collimator.
I've tried looking at a reflection on a distant insulator but daytime reflections are difficult to see the supple rings each side of focus .

The other reason i need an artificial star is I've no EQ mount .

Cheers
Bobby .
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