AstroBin

AstroBin

AstroBin

Scattered light from nearby bright stars Celestron EdgeHD 11" · Vitali · ... · 7 · 502 · 3

sunlover 10.46
Vitali
...
· 
·  4 likes
·  Share link
Hi everyone!

There is a known issue with Celestron EdgeHD scopes: a nearby bright star produces rays of scattered light. It looks like this:


Little Dipper - An Asterism in Perseus

According to my measurements a bright star should be approximately from 27 to 35 acrmins from the center of the field of view to produce this effect in EdgeHD 11 scope.

Here is an animation of frames (full frame sensor) where a 2m star Mirach is positioned from 21 to 35 arcmins from the FOV center. As you can see, frames at 29, 31 and 33 arcmins are affected:



And the same frames in a column:

Mirach_Distance_from_Center.png

I hope that this will be helpful. I take this into account when I frame targets and try to make sure that no bright stars are located in the "bad"  range.

CS,
Vitali
Like
×

Sorry :-(

Editing a post is only allowed within 24 hours after creating it.
×

Share this forum post

Copy the URL below to share a direct link to this post.

Close
×

Post editing not available

This post cannot be edited using the classic forums editor.

To edit this post, please enable the "New forums experience" in your settings.

Go to Settings Close
sharifov 0.00
Vilen Sharifov
...
· 
·  Share link
Thanks for info, Vitali! 
CS!
Like
×

Sorry :-(

Editing a post is only allowed within 24 hours after creating it.
×

Share this forum post

Copy the URL below to share a direct link to this post.

Close
×

Post editing not available

This post cannot be edited using the classic forums editor.

To edit this post, please enable the "New forums experience" in your settings.

Go to Settings Close
Christophorus 12.36
Christoph Lichtblau
...
· 
·  1 like
·  Share link
This problem dissapeares by using a dew cap very nicely.

Cheers, Christoph
Like
×

Sorry :-(

Editing a post is only allowed within 24 hours after creating it.
×

Share this forum post

Copy the URL below to share a direct link to this post.

Close
×

Post editing not available

This post cannot be edited using the classic forums editor.

To edit this post, please enable the "New forums experience" in your settings.

Go to Settings Close
StHz 0.00
Stefan
...
· 
·  Share link
Indeed, I always use a dew cap and have not encountered that issue so far. 

Cheers, Stefan
Like
×

Sorry :-(

Editing a post is only allowed within 24 hours after creating it.
×

Share this forum post

Copy the URL below to share a direct link to this post.

Close
×

Post editing not available

This post cannot be edited using the classic forums editor.

To edit this post, please enable the "New forums experience" in your settings.

Go to Settings Close
sunlover 10.46
Vitali
Topic starter
...
· 
·  Share link
Christoph Lichtblau:
This problem dissapeares by using a dew cap very nicely.


Stefan:
Indeed, I always use a dew cap and have not encountered that issue so far.


I've forgot to mention that my scope has an Astrozap aluminium dew cap (AZ-256).
Like
×

Sorry :-(

Editing a post is only allowed within 24 hours after creating it.
×

Share this forum post

Copy the URL below to share a direct link to this post.

Close
×

Post editing not available

This post cannot be edited using the classic forums editor.

To edit this post, please enable the "New forums experience" in your settings.

Go to Settings Close
StHz 0.00
Stefan
...
· 
·  1 like
·  Share link
Vitali:
I've forgot to mention that my scope has an Astrozap aluminium dew cap (AZ-256).

That‘s interesting. I use an APS-C sized sensor not a full frame. Perhaps that is part of the story.
Like
×

Sorry :-(

Editing a post is only allowed within 24 hours after creating it.
×

Share this forum post

Copy the URL below to share a direct link to this post.

Close
×

Post editing not available

This post cannot be edited using the classic forums editor.

To edit this post, please enable the "New forums experience" in your settings.

Go to Settings Close
sunlover 10.46
Vitali
Topic starter
...
· 
·  Share link
Stefan:
I use an APS-C sized sensor not a full frame.

Actually you are right. I did not notice this issue with my old ASI071MC camera which has APS-C sensor. Now I use a full frame ASI2400 and these rays became visible.
Like
×

Sorry :-(

Editing a post is only allowed within 24 hours after creating it.
×

Share this forum post

Copy the URL below to share a direct link to this post.

Close
×

Post editing not available

This post cannot be edited using the classic forums editor.

To edit this post, please enable the "New forums experience" in your settings.

Go to Settings Close
Corvik 0.90
Alex
...
· 
·  Share link
It's not tied to the EdgeHD specifically.  I've had the same thing happen with my William Optics GT81 and ASI6200MM.  I'm wanting to say it was Deneb when I was shooting the North American Nebula and Pelican Nebula.  I suspect it's tied to sensor size and what the image circle from the scope is plus how far out of frame the bright star is.  I had a momentary panic that my at the time new ASI6200MM was dying.
Edited ...
Like
×

Sorry :-(

Editing a post is only allowed within 24 hours after creating it.
×

Share this forum post

Copy the URL below to share a direct link to this post.

Close
×

Post editing not available

This post cannot be edited using the classic forums editor.

To edit this post, please enable the "New forums experience" in your settings.

Go to Settings Close
 
Register or login to create to post a reply.
×

Warning!

This operation will reload the current page. If you have any unsaved information in a form, it will be lost.

You can also dismiss this window, and your operation will be applied at the next page navigation.