AstroBin

AstroBin

AstroBin

Using a doublet for mono imaging? [Solar System] Acquisition techniques · Photon_Collector · ... · 5 · 246 · 0

Photon_Collector 1.43
Photon_Collector
...
· 
·  1 like
·  Share link
I have the Zenithstar 61 small refractor from William Optics. I will send my bigger Askar 120 to a remote observatory with a OSC camera, and would like to buy a mono camera to use from home (light polluted) while my better rig is imaging from Bortle 1. 

I've heard doublets are actually good for mono imaging, anyone have experience(s) they can share?
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
Gondola 8.11
Tony Gondola
...
· 
·  2 likes
·  Share link
Yes, you certainly can. I've done a lot with a cheap ST-80 doublet using dual band filters and a relatively small sensor camera (585). Shooting mono would work even better as you don't have to deal with the different best focus points you get with dual-band OSC.
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
messierman3000 7.22
Oscar
...
· 
·  1 like
·  Share link
if you don't take luminance and you had an achromatic scope (single element, worse than doublet), and if you refocus per RGB filter, you can get away with no CA (because CA comes from R, G, B focus points that vary from each other a little)
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
jimmythechicken 19.44
Charles Hagen
...
· 
·  2 likes
·  Share link
if you don't take luminance and you had an achromatic scope (single element, worse than doublet), and if you refocus per RGB filter, you can get away with no CA (because CA comes from R, G, B focus points that vary from each other a little)

That is a wildly inaccurate oversimplification. Red, Green and Blue all are ranges of wavelengths that can all experience CA within their respective band passes. Even if you are shooting narrowband which is effectively a single wavelength that will not experience CA, your singlet will likely not be optimized for that wavelength and you will get other extreme aberrations. If you are looking to take nice images, a high quality doublet can be fine for narrowband, but I would not recommend anything cheap. There are many other considerations to be made beyond the number of elements in the scope.
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
messierman3000 7.22
Oscar
...
· 
·  Share link
Charles Hagen:
if you don't take luminance and you had an achromatic scope (single element, worse than doublet), and if you refocus per RGB filter, you can get away with no CA (because CA comes from R, G, B focus points that vary from each other a little)

That is a wildly inaccurate oversimplification. Red, Green and Blue all are ranges of wavelengths that can all experience CA within their respective band passes. Even if you are shooting narrowband which is effectively a single wavelength that will not experience CA, your singlet will likely not be optimized for that wavelength and you will get other extreme aberrations. If you are looking to take nice images, a high quality doublet can be fine for narrowband, but I would not recommend anything cheap. There are many other considerations to be made beyond the number of elements in the scope.

thank you for correcting me
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
Taman 1.81
Taman
...
· 
·  1 like
·  Share link
I have the Zenithstar 61 small refractor from William Optics. I will send my bigger Askar 120 to a remote observatory with a OSC camera, and would like to buy a mono camera to use from home (light polluted) while my better rig is imaging from Bortle 1. 

I've heard doublets are actually good for mono imaging, anyone have experience(s) they can share?

I have the Zenithstar 73 and have successfully used it for narrowband. Provided your stars look reasonable with a colour camera, you should have no problems with mono. Here's one of my better examples:

https://www.astrobin.com/0fue8u/C/
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.