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.

keramos

Help needed 3D printing Bahtinov Mask for ZWO mini guide scope

Recommended Posts

Hello All,

I wondered if someone could 3D print a Bahtinov Mask for me, I've got the STL file from thingiverse.com for this particular guide scope. I'll be more than happy to pay for time, material, and postage cost.

Alternatively if someone know's where I can get the mask printed that too will be very helpful.

ps: couldn't find a mask for such a small scope/aperture with any of the online vendors.

Thanks in advance.

Share this post


Link to post
Share on other sites

My understanding is that guiding benefits from slightly soft focus so doing it by eye would be fine and even then it might need slightly defocused.

Michael

  • Like 1

Share this post


Link to post
Share on other sites

Well I thought I had good focus, set the guide camera and scope in ASI Air as main camera and scope and too some test shots. Then swapped back to Red Cat and DSLR as main scope and primarily camera.

In guiding it shows up the star as a fuzzy blob so I wondered if it was focus as guiding was all over the place (in one instance I had nothing on the graph).

Scope is balanced and polar aligned.

Share this post


Link to post
Share on other sites

Why not just adjust the focus - as said it doesn't have to be spot on.

  • Like 1

Share this post


Link to post
Share on other sites

How “soft” does the focus need be? Any examples so that I have an idea of what to aim for.

Share this post


Link to post
Share on other sites

usually a fuzzy, not too bright blob, is ok..... Let PHD2 decide what it wants to use to guide on !!

  • Like 2

Share this post


Link to post
Share on other sites

If you are using one of the later versions of PHD2, the present developers (Andy Galasso, Bruce Waddington &c) recommend (sometimes on an almost daily basis on the Open PHD guiding forum) getting the guide camera focus as sharp as possible: 

link 1

link 2

While the centroid computation can cope with some pretty hefty distortion (fortunately for those of us using OAGs), they state that the best results come from sharp guide stars.

They suggest using the HFD figure as a guide and adjusting guide scope focus to minimise this.  For me that figure is seldom stable enough to judge whether an adjustment has improved matters so some sort of mask can be very helpful.

To get a small 3d print, I have used 3d Hubs  in the past and they were pretty reasonable and fairly quick.  I think it was a case of up load the file, choose the material and some other things and they quoted there and then.
 

  • Like 1

Share this post


Link to post
Share on other sites
7 hours ago, keramos said:

I wondered if someone could 3D print a Bahtinov Mask for me, I've got the STL file from thingiverse.com for this particular guide scope. I'll be more than happy to pay for time, material, and postage cost.

Send me the file and your address by PM and I'll get it done this week.

Michael

  • Like 2

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

  • 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.