Jump to content

Stargazers Lounge Uses Cookies

Like most websites, SGL uses cookies in order to deliver a secure, personalised service, to provide social media functions and to analyse our traffic. Continued use of SGL indicates your acceptance of our cookie policy.

JSeaman

Spacing Atik 314 to an ED80 with Reducer

Recommended Posts

I could do with a bit of guidance on spacing please, after looking here:

https://stargazerslounge.com/topic/180389-atik-314l-with-ed80-questions/page/2/

I see the recommendation is:

0.85 reducer --> M4/T2 --> 11mm --> T2/M54 --> EFW2 --> Atik 314L+

I currently have (see pic)

0.85 reducer --> Adaptor --> EFW2 --> Atik 314L

I have no problem focussing with a Bahtinov mask but don't know what the effect is of having replaced the bits between the focal reducer and EFW with the adaptor I just happened to have lying around. I've never really thought about it until now!

Note I'm also using the 314L not the +, I am assuming they have the same spacing

James
 

Spacing.jpg

Share this post


Link to post
Share on other sites

Try spacing upto 60mm. What total length of spacing do you have?

Edited by Skyline

Share this post


Link to post
Share on other sites

I use the same reducer on my ED80 with both a Canon 70D and an Atik 414ex-osc.

This is what works for me and why:

When using a Canon 70D the EoS adapter sets the distance from the reducer end face to the sensor at 55mm

1479020149_Canon-reducerspacing.thumb.jpg.2e22ca269569b7a7e692c075f0bc9d8d.jpg

So I use spacers to create the same spacing when using the Atik414ex-osc - so B-D on the photo below needs to be 55mm

Spacing.thumb.jpg.ff6fab6b01177382c944e7d0d70cfa7a.jpg

If you're using a mono with filters the spacing will increase slightly.

Others may have different advice to offer but the above works for me. I am able to achieve good focus and no odd shaped stars.

HTH

Adrian

Share this post


Link to post
Share on other sites

Thanks, I guess my query is, if I'm achieving focus does anything need to change?

Share this post


Link to post
Share on other sites
Quote

Thanks, I guess my query is, if I'm achieving focus does anything need to change?

What are the corner stars like in your images.  If they are perfectly round you have the spacing right, if they are elongated then the spacing is not right.

Carole 

  • Like 1

Share this post


Link to post
Share on other sites
1 hour ago, JSeaman said:

if I'm achieving focus does anything need to change?

I agree with Carole. I was often asked why I used the flattener at all; you might argue it is not required for a camera with a chip size of the 314 (or 414 in my case). It was easier for me to leave it in place in case I ever wanted to switch to the 70D.

Why not try it without and see how you get on?

 

Share this post


Link to post
Share on other sites

I bought it for use with a 70D coincidentally, now I have moved ot the Atik I considered removing it actually.

My stars are quite blobby everywhere in the image but no worse in the corners so guess I'm OK 

Thank you all

Share this post


Link to post
Share on other sites
39 minutes ago, JSeaman said:

My stars are quite blobby everywhere in the image but no worse in the corners

Just for comparison this is M81-M82 I took back in Feb 2017 just after I got the 414ex-osc using my ED80DS-Pro on an NEQ6. I think the focus could have been better but at the time I was still learning how to focus correctly with the software I was using at the time.

050217-M81-M82.thumb.jpg.548c80e624497f5bb619d30dedd70a36.jpg

This was processed in DSS and CS6 - well before I started using PI.

One of these days (cloudy nights) I should revisit my early images and reprocess them.

Hope this is of interest.

Good luck.

Share this post


Link to post
Share on other sites

I'd measure it with callers, a 10mm spacer isn't always 10mm

With my 16hr( same sensor) I used 55mm plus .66 for filters

Share this post


Link to post
Share on other sites

Removed the focal reducer, needed the lakeside focuser fully extended and an extension tube to focus but still blobby stars :(

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


  • Recently Browsing   0 members

    No registered users viewing this page.

×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.