#1  
Old 18-01-2024, 03:43 PM
MarkInSpace (Mark)
Registered User

MarkInSpace is offline
 
Join Date: Jul 2020
Location: Melbourne
Posts: 243
Pimped up my RC-8

When I read that fellow iceinspacer and engineer Joshua Bunn has made a focuser mount for the GSO RC-8, I couldn’t wait to get one.
A well known flaw of the RC-8 is that the focuser directly hangs off the back of the Primary mirror, making collimation problematic.
Joshua’s addition to the telescope provides a platform for the focussed to sit on- this removes the link between mirror and focuser.
A picture is worth a thousand words. The first shows the extension in its raw state.
The second and third photos show the extension mounted on the back plate of the RC-8. Joshua’s attention to detail and excellent anodising makes the entire assembly super smart looking.
Finally- first light through the upgraded and easily collimated RC-8.
So nice!! Thanks Joshua!!
Attached Thumbnails
Click for full-size image (pro-FvMXdDUc.jpg)
107.9 KB140 views
Click for full-size image (image0.jpg)
190.0 KB147 views
Click for full-size image (image1.jpg)
216.4 KB133 views
Click for full-size image (image2.jpg)
136.9 KB119 views
Reply With Quote
  #2  
Old 18-01-2024, 03:49 PM
Stonius's Avatar
Stonius (Markus)
Registered User

Stonius is offline
 
Join Date: Mar 2015
Location: Melbourne
Posts: 1,496
Did you find the collimation process much easier?
Reply With Quote
  #3  
Old 18-01-2024, 04:25 PM
MarkInSpace (Mark)
Registered User

MarkInSpace is offline
 
Join Date: Jul 2020
Location: Melbourne
Posts: 243
Collimation is a bit easier because you are not battling the focuser weight.
Reply With Quote
  #4  
Old 18-01-2024, 09:50 PM
Stonius's Avatar
Stonius (Markus)
Registered User

Stonius is offline
 
Join Date: Mar 2015
Location: Melbourne
Posts: 1,496
does the collimation still change the field with each adjustment? Can you keep a star field centered while you work on it?
Reply With Quote
  #5  
Old 19-01-2024, 04:32 AM
MarkInSpace (Mark)
Registered User

MarkInSpace is offline
 
Join Date: Jul 2020
Location: Melbourne
Posts: 243
Adjusting the collimation also changes the view. Smaller adjustments result in smaller star movements. I use a TSRCKOLLI for my initial collimation and star test to fine tune. Shifting fields of view don’t cause me problems.
Reply With Quote
  #6  
Old 19-01-2024, 12:50 PM
Leo.G (Leo)
Registered User

Leo.G is offline
 
Join Date: Nov 2016
Location: Lithgow, NSW, Australia
Posts: 547
That look amazing, I'm hoping to have the cash get one soon for my RC8.
Reply With Quote
  #7  
Old 19-01-2024, 01:23 PM
MarkInSpace (Mark)
Registered User

MarkInSpace is offline
 
Join Date: Jul 2020
Location: Melbourne
Posts: 243
RC-8 carbon

Quote:
Originally Posted by Leo.G View Post
That look amazing, I'm hoping to have the cash get one soon for my RC8.
The addition of the focuser mount really changes my view of this telescope.
Carbon fibre versions are readily available at a good price!
Reply With Quote
  #8  
Old 19-01-2024, 02:04 PM
kencas (Ken)
Registered User

kencas is offline
 
Join Date: Jul 2007
Location: Brisbane QLD
Posts: 73
I would love one of those for my carbon fibre RC8. How did you get in touch with Joshua? Does he advertise these somewhere?
Reply With Quote
  #9  
Old 19-01-2024, 03:27 PM
mldee's Avatar
mldee (Mike)
Photon sorter

mldee is online now
 
Join Date: Aug 2008
Location: Near Warwick, Qld, Australia
Posts: 653
PM Joshua Bunn

Joshua Bunn is also his IIS name, so you could contact him via PM here.
I also have Joshua's adaptor, and have posted here on my admiration for its elegant design and build quality.

Unfortunately since receiving the adaptor last November, house guests, Christmas and clouds have inhibited my setting it up on the external pier for star tests. OCAL tests look promising and easy to achieve collimation. See some of my earlier posts re this: https://www.iceinspace.com.au/forum/...d.php?t=206352.

Clouds are still rolling in each day and the black soil around the mount needs a day or two to dry out each time it rains
Reply With Quote
  #10  
Old 19-01-2024, 04:06 PM
MarkInSpace (Mark)
Registered User

MarkInSpace is offline
 
Join Date: Jul 2020
Location: Melbourne
Posts: 243
I completely agree with your comments around Joshua’s terrific work, Mike!
Your original post is what prompted me to order one from Joshua!
Reply With Quote
  #11  
Old 21-01-2024, 02:37 PM
Leo.G (Leo)
Registered User

Leo.G is offline
 
Join Date: Nov 2016
Location: Lithgow, NSW, Australia
Posts: 547
Oh, I have the carbon RC8.



I must contact Joshua soon and organise this device. From memory he mentioned having to machine a separate alignment ring if I insist on fitting it myself. I have a milling machine at my disposal when I set it up on it's compound slide table (milling machine is still in it's crate). I have to weld a stand up for it first. It should allow me to fit the unit accurately.

We have clear skies today (and heat, hopefully my grass will finally die instead of growing 3 inches in the time it takes to sit out the back and have a smoke, I can hear it growing) and I'm hoping to take the RC8 out to play with my newly acquired Tele Vue Powermate 5 times. I'm thinking if the skies don't get sprayed over with toxic cloud later in the day (like every other day) I may be able to focus on a small group of craters on the moon.
If I get the Meade DSI 2 colour working with the laptop, it refused to play last time.
I have the D810 as backup I suppose......
The dedicated camera is lighter and much easier to use, plus I can see to focus on the larger laptop screen.
Reply With Quote
  #12  
Old 29-01-2024, 09:04 AM
Joshua Bunn's Avatar
Joshua Bunn (Joshua)
Registered User

Joshua Bunn is offline
 
Join Date: Oct 2011
Location: Albany, Western Australia
Posts: 1,467
Hello Mark.


I have just come across this thread
Thanks for the support mate! I'm glad it's working well for you.


Ken, I would be happy to make you one, if you want to contact me, my email is

Scastrophotography@outlook.com



Cheers, Joshua
Reply With Quote
  #13  
Old 10-04-2024, 03:43 PM
Leo.G (Leo)
Registered User

Leo.G is offline
 
Join Date: Nov 2016
Location: Lithgow, NSW, Australia
Posts: 547
Any updates on performance Mike?


I'm still chasing monies owed to me so I can get Joshua to make me the adapter for my RC8, hopefully soon.
Reply With Quote
  #14  
Old 11-04-2024, 11:28 AM
mldee's Avatar
mldee (Mike)
Photon sorter

mldee is online now
 
Join Date: Aug 2008
Location: Near Warwick, Qld, Australia
Posts: 653
Finally some decent weather

After months of cloudy skies and rain, the last few nights have been cloudless, although a bit windy. Used the main obs truss Newt to hone my rusty skills a bit, focussing on some objects in Puppus that are soon to go past my bedtime.

The RC still sits silently on the bench, but I think I should be ready to take it out later this week or next. Temps at night are already in the single digits so that should be an incentive to accelerate star testing and adjustment efforts.

Thanks to Cuiv on YT, I also now have the mini PC on the outside mount talking reliably to the nearby RD tablet screen, so any adjusting should be easier too. If only I had a good solution for attaching the tablet to the mount so I have both hands free for scope adjustments if needed. More bungee cords......

News at 11.
Reply With Quote
  #15  
Old 12-04-2024, 08:23 PM
mldee's Avatar
mldee (Mike)
Photon sorter

mldee is online now
 
Join Date: Aug 2008
Location: Near Warwick, Qld, Australia
Posts: 653
Finally - First star test

Another cloud-free night snuck up on me, after being cloudy all day. So rush rush, hurry hurry at twilight (Wine o'clock time too!) setting things up on the AM5 mount. Couldn't find any of the USB cables that I'd put away for safekeeping, so plenty of USB problems reared their heads.

I used CdC to slew the scope to the middle of the LMC as a pretty starry area at about 45 degrees elevation.

Anyway, the pics below tell the story. The first light pic 1 is without any adjustments since the last OCAL pics in December. Not too bad. I then tried a minor fiddle of the secondary mirror screws, but didn't spend much time, rather do a final fine tune on the bench. pic 4 and 5 are after twiddle.

BTW, Cuiv's latest hotspot setup worked a treat, my little ebay tablet was rock solid at the mount. I'll spend tomorrow recabling and then final star test.
Attached Thumbnails
Click for full-size image (1 First light obs RD.jpg)
98.6 KB8 views
Click for full-size image (2 Mount mess.jpg)
66.5 KB9 views
Click for full-size image (3 Image train mess.jpg)
197.5 KB10 views
Click for full-size image (4 Tablet final stars.jpg)
64.6 KB12 views
Click for full-size image (5 Final obs RD star test.jpg)
114.3 KB9 views

Last edited by mldee; 13-04-2024 at 02:25 PM. Reason: wrong hyphen spot
Reply With Quote
  #16  
Old 13-04-2024, 12:00 PM
Leo.G (Leo)
Registered User

Leo.G is offline
 
Join Date: Nov 2016
Location: Lithgow, NSW, Australia
Posts: 547
I do that with my USB cables and power supplies all of the time.
Reply With Quote
Reply

Bookmarks

Thread Tools
Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +10. The time is now 07:17 PM.

Powered by vBulletin Version 3.8.7 | Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Advertisement
Testar
Advertisement
Bintel
Advertisement