9 replies to this topic

[Jerry Lodriguss]

I’ve just posted a fairly long article on Diagnosing Trailed Stars on my web site.

 

http://www.astropix....iled_Stars.html

 

Click on the link to see the article.

 

Trailed, or elongated stars in long-exposure astrophotographs are something that every astrophotographer runs into sooner or later. Usually sooner!

 

I’ve got a lot of tips here to help you diagnose and solve problems with trailed stars.

 

Let me know what you think!

 

Jerry

 

[DavM]

Great write up! Many thanks Jerry.

Regards Dave

[NorthField]

Good stuff Jerry!! fun and informative read

 

( my biggest causes are: #1 Aliens #2 Earthquakes #3 the dog ate my roundness )

[Jerry Lodriguss]

Great write up! Many thanks Jerry.

Regards Dave

Thanks Dave!

 

Jerry

[Jerry Lodriguss]

Good stuff Jerry!! fun and informative read

 

( my biggest causes are: #1 Aliens #2 Earthquakes #3 the dog ate my roundness )

I should add your number three, that's hilarious!

 

Jerry

[calypsob]

I’ve just posted a fairly long article on Diagnosing Trailed Stars on my web site.

 

http://www.astropix....iled_Stars.html

 

Click on the link to see the article.

 

Trailed, or elongated stars in long-exposure astrophotographs are something that every astrophotographer runs into sooner or later. Usually sooner!

 

I’ve got a lot of tips here to help you diagnose and solve problems with trailed stars.

 

Let me know what you think!

 

Jerry

 

Trails_09.jpg

Good stuff Jerry, I wish I had known about how to diagnose polar drift a long time ago.  It took a while to get that figured out. Im sure that future green AP'ers will really benefit from your insight! 

[Jerry Lodriguss]

 

I’ve just posted a fairly long article on Diagnosing Trailed Stars on my web site.

 

http://www.astropix....iled_Stars.html

 

Click on the link to see the article.

 

Trailed, or elongated stars in long-exposure astrophotographs are something that every astrophotographer runs into sooner or later. Usually sooner!

 

I’ve got a lot of tips here to help you diagnose and solve problems with trailed stars.

 

Let me know what you think!

 

Jerry

 

Trails_09.jpg

Good stuff Jerry, I wish I had known about how to diagnose polar drift a long time ago.  It took a while to get that figured out. Im sure that future green AP'ers will really benefit from your insight! 

 

Hi Wes,

 

Thanks for taking a look!

 

Jerry

[GoldSpider]

I wouldn't be surprised if some of my PHD2 challenges can be traced back to some cable-tug.  I bet you could make a whole article out of the subject of cable management.

 

Edit:  If only Jerry would write an article on the subject for Sky & Telescope...

Edited by GoldSpider, 25 October 2017 - 07:35 AM.

[Phil Sherman]

I think that very few of us can take exposures of a worm period or longer without saturating the image. The longest I can do at home is around one minute, a result of light pollution. An alternative to a long exposure is to stack, without alignment, a series of short exposures. I've done this using 30 second exposures with great success.

 

Periodic error is easy to measure doing this if you deliberately polar misalign a bit in azimuth and measure at the meridian on the celestial equator.

[Goofi]

Moderator Note:

 

I added this thread to our Best Threads in Beginning Imaging