Star Testing

[ariefm71]

Hi, i need some advise on doing a star test. Anyone read this book before: http://www.willbell.com/tm/tm5.htm? Any other good references/links out there?

clear skies,
arief

[Debash]

These might be of some help:

http://www.cloudynights.com/howto/star%20testing.htm

Simple step by step instructions:

http://aberrator.astronomy.net/html/star-testing.html

Also..you can download the Aberrator software from here:

http://aberrator.astronomy.net/

cheers

[kingkong]

my st102f5az refractor gives this very peculiar out-of-focus pattern - a disc with a diagonal (more or less) line across it.
in a reflector or other hybrids, one may gets a cross, and the black center, but a single diagonal line in a refractor? where can that possibly comes from? the diagonal?
i'll try to capture the image and do some tests of elimination, but would appreciate some tips from here.
thanks.

[VinSnr]

Hi, i need some advise on doing a star test. Anyone read this book before: http://www.willbell.com/tm/tm5.htm? Any other good references/links out there?

clear skies,
arief

I have that book. It is very theoretical, but very useful.

[ariefm71]

I have that book. It is very theoretical, but very useful.

can borrow? or buy together with your meade diagonal if you don't use it anymore? need something to read during my overseas trip next week.

[kayheem]

my st102f5az refractor gives this very peculiar out-of-focus pattern - a disc with a diagonal (more or less) line across it.
in a reflector or other hybrids, one may gets a cross, and the black center, but a single diagonal line in a refractor? where can that possibly comes from? the diagonal?
i'll try to capture the image and do some tests of elimination, but would appreciate some tips from here.
thanks.

Hi,

Are you by any chance using a 45 deg Amci erect image diagonal? These diagonals are not suitable for astro use as they cause a single line across a bright star.

Kay Heem