Jump to content

  •  

CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.

Photo

ZWO ASI533MC + William Optics ZenithStar 61II + L-eXtreme 1.25"

  • Please log in to reply
13 replies to this topic

#1 Spastroof

Spastroof

    Explorer 1

  • -----
  • topic starter
  • Posts: 96
  • Joined: 27 Mar 2021
  • Loc: Riyadh, Saudi Arabia

Posted 11 June 2021 - 06:03 AM

I'm planning to upgrade from my Canon 70D astro modified to ZWO ASI533MC to use it with my William Optics ZenithStar 61II. I'm just wondering how to connect the ASI533MC to the Telescope with Flat61 (not the Adjustable one) , is everything included in ASI533MC box or I have to buy an additional adapter to be able to connect it? Also, I'm planning to use the Optolong L-eXtreme 1.25" filter and not sure if that will affect anything with the back focus.

 

This is my flattener: https://agenaastro.c...ttener-z61.html


Edited by Spastroof, 11 June 2021 - 07:13 AM.


#2 DeanCN

DeanCN

    Mariner 2

  • -----
  • Posts: 210
  • Joined: 13 Sep 2011
  • Loc: Dundas, ON

Posted 11 June 2021 - 07:52 AM

the ASI533MC Pro I have and the companion documentation for it also show that it comes with a T2-1.25" adapter

you can thread a 1.25" filter into.  The T2 outer male threads allow you to thread the adapter inside one of

the T2 extenders that also come with the camera.


  • Spastroof likes this

#3 Spastroof

Spastroof

    Explorer 1

  • -----
  • topic starter
  • Posts: 96
  • Joined: 27 Mar 2021
  • Loc: Riyadh, Saudi Arabia

Posted 11 June 2021 - 09:04 AM

the ASI533MC Pro I have and the companion documentation for it also show that it comes with a T2-1.25" adapter

you can thread a 1.25" filter into.  The T2 outer male threads allow you to thread the adapter inside one of

the T2 extenders that also come with the camera.

 

So what I understood is that I can attach the ASI533 to the Flat61 and the 1.25" with the adapters that come with the camera and I'll have no focus issue, correct?



#4 ChiTownXring

ChiTownXring

    Mariner 2

  • *****
  • Posts: 282
  • Joined: 12 Aug 2020
  • Loc: Sugar Grove, IL

Posted 11 June 2021 - 09:25 AM

So what I understood is that I can attach the ASI533 to the Flat61 and the 1.25" with the adapters that come with the camera and I'll have no focus issue, correct?

You will have to measure and achieve the correct back focus (55mm) just like with any camera and may need to use more or less adapters to get there but you probably already knew that..


  • Spastroof likes this

#5 unimatrix0

unimatrix0

    Ranger 4

  • -----
  • Posts: 355
  • Joined: 03 Jan 2021

Posted 11 June 2021 - 09:35 AM

If your non-adjustable flattener requires 55mm space to your ASI533  (you have to check this one, because the adjustable version of it needs 67.7mm), the ASI533 comes directly with 3 spacers and if you look at the online diagram, you gonna see that if you use all 3 spacers, you get 55mm. 
Also the ASI 533 comes with a filter adapter ring thingie,  that goes inside the first spacer directly front of the sensor. 
You basically get everything in the box along with the ASI533 all the necessary hardware (beside the 12 volt power adapter) to connect your camera to a flattener that needs 55mm back focus. 
Scroll to the bottom of this page what is included. 

https://astronomy-im...533mc-pro-color

 

55MM-COOLED-CAMERA-1024x474.jpg


Edited by unimatrix0, 11 June 2021 - 09:38 AM.

  • Spastroof likes this

#6 Spastroof

Spastroof

    Explorer 1

  • -----
  • topic starter
  • Posts: 96
  • Joined: 27 Mar 2021
  • Loc: Riyadh, Saudi Arabia

Posted 11 June 2021 - 10:06 AM

You will have to measure and achieve the correct back focus (55mm) just like with any camera and may need to use more or less adapters to get there but you probably already knew that..

 

 

If your non-adjustable flattener requires 55mm space to your ASI533  (you have to check this one, because the adjustable version of it needs 67.7mm), the ASI533 comes directly with 3 spacers and if you look at the online diagram, you gonna see that if you use all 3 spacers, you get 55mm. 
Also the ASI 533 comes with a filter adapter ring thingie,  that goes inside the first spacer directly front of the sensor. 
You basically get everything in the box along with the ASI533 all the necessary hardware (beside the 12 volt power adapter) to connect your camera to a flattener that needs 55mm back focus. 
Scroll to the bottom of this page what is included. 

https://astronomy-im...533mc-pro-color

 

55MM-COOLED-CAMERA-1024x474.jpg

 

Thank you both for the explanation, I'm not too familiar space measurement but I found this image in William Optics website for the flattener that I'm using and I understood nothing from the image 😅 could you please check if the spacers will give the required mm for focus or not? 

 

A-Z61_Back_Focus.png



#7 unimatrix0

unimatrix0

    Ranger 4

  • -----
  • Posts: 355
  • Joined: 03 Jan 2021

Posted 11 June 2021 - 11:25 AM

Yeah, according to the diagram, you need 54.80mm, with the 55mm you're fine. 


  • Spastroof likes this

#8 Spastroof

Spastroof

    Explorer 1

  • -----
  • topic starter
  • Posts: 96
  • Joined: 27 Mar 2021
  • Loc: Riyadh, Saudi Arabia

Posted 11 June 2021 - 11:36 AM

Yeah, according to the diagram, you need 54.80mm, with the 55mm you're fine. 

 

Thank you so much for your help.



#9 jonnybravo0311

jonnybravo0311

    Surveyor 1

  • *****
  • Posts: 1,736
  • Joined: 05 Nov 2020
  • Loc: NJ, US

Posted 11 June 2021 - 11:46 AM

I'm not sure how you're going to get that 1.25" filter in the imaging train... ZWO has a filter drawer, but it's for 2" filters, not 1.25".

 

EDIT

 

I found a thread discussing how to use the 1.25" filter: https://www.cloudyni...-4#entry9831093


Edited by jonnybravo0311, 11 June 2021 - 11:54 AM.

  • Spastroof likes this

#10 dx_ron

dx_ron

    Ranger 4

  • *****
  • Posts: 341
  • Joined: 10 Sep 2020
  • Loc: SW Ohio

Posted 11 June 2021 - 11:53 AM

I never noticed the "166.20" at the very bottom before. If you have a good way to measure that, it should get you a good start for rough focus. Probably easiest to measure 111.2 from the back of the telescope body to the back of the reducer to use as your focus starting point. (I use the Astro-Tech AT60ED reducer on my Z61, and it does not have that measurement on the diagram, so I can't promise this actually works)


Edited by dx_ron, 11 June 2021 - 12:02 PM.

  • Spastroof likes this

#11 DeanCN

DeanCN

    Mariner 2

  • -----
  • Posts: 210
  • Joined: 13 Sep 2011
  • Loc: Dundas, ON

Posted 11 June 2021 - 01:50 PM

johnnybravo0311 has posted the link with the image of the 1.25" adapter and filter threaded inside the 11mm spacer in front of the sensor.

I used the ZWO 1.25" UV/IR cut filter this way.  Use latex gloves: its small and finicky to thread it and snug it just so without getting any finger prints on the filter.

You can also carefully use a small jeweller's screwdriver or toothpick inserted into one of the 4 holes of the adapter and rotate it in snug.



#12 Spastroof

Spastroof

    Explorer 1

  • -----
  • topic starter
  • Posts: 96
  • Joined: 27 Mar 2021
  • Loc: Riyadh, Saudi Arabia

Posted 11 June 2021 - 02:15 PM

I'm not sure how you're going to get that 1.25" filter in the imaging train... ZWO has a filter drawer, but it's for 2" filters, not 1.25".

 

EDIT

 

I found a thread discussing how to use the 1.25" filter: https://www.cloudyni...-4#entry9831093

Yes I had the same concern but I saw the same post you posted here and I believe it's a good thing as the 1.25" is much cheaper haha

 

I never noticed the "166.20" at the very bottom before. If you have a good way to measure that, it should get you a good start for rough focus. Probably easiest to measure 111.2 from the back of the telescope body to the back of the reducer to use as your focus starting point. (I use the Astro-Tech AT60ED reducer on my Z61, and it does not have that measurement on the diagram, so I can't promise this actually works)

 

Will try this but what I usually do to know exactly the sharp point after the 1st use is to mark by a knife by making a really small scratch on the number lol

 

johnnybravo0311 has posted the link with the image of the 1.25" adapter and filter threaded inside the 11mm spacer in front of the sensor.

I used the ZWO 1.25" UV/IR cut filter this way.  Use latex gloves: its small and finicky to thread it and snug it just so without getting any finger prints on the filter.

You can also carefully use a small jeweller's screwdriver or toothpick inserted into one of the 4 holes of the adapter and rotate it in snug.

 

I see. Will check that once I received the items.



#13 bobzeq25

bobzeq25

    ISS

  • *****
  • Posts: 24,679
  • Joined: 27 Oct 2014

Posted 12 June 2021 - 11:48 AM

With my C8 RASA and PreciseParts adapter, I had to thin the t2-1.25 piece a fraction of a mm (I used sandpaper) to fit everything together.


  • Spastroof likes this

#14 Kevin_A

Kevin_A

    Viking 1

  • *****
  • Posts: 671
  • Joined: 22 Aug 2018
  • Loc: Belmont, Ontario Canada

Posted 12 June 2021 - 02:33 PM

The camera should come with all the adapters and spacers… mine did. 


  • Spastroof likes this


CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.


Recent Topics






Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics