Telrad
Moderators: defalkner, Sureshks, SEmert
- Sureshks
- Posts: 1235
- Joined: Fri Aug 29, 2014 10:43 pm
- Real Name: Suresh Sreenivasan
- Location: Hopkins, MN
Re: Telrad
Hi Jessi,
If I understand your question properly, you are trying to line up the telrad with your main scope?
The easiest way to do it at night is to use the Moon. It's a big bright object that you can easily find in your telescope without the finder. Once it's centered in the eyepiece you can adjust the three knobs on the front of the telrad to maneuver the red telrad circles so that the Moon is also centered.
If there's no Moon available, just take the scope out during the day and find a far away tree branch, roof or window and do the same.
I hope this helps!
Suresh
If I understand your question properly, you are trying to line up the telrad with your main scope?
The easiest way to do it at night is to use the Moon. It's a big bright object that you can easily find in your telescope without the finder. Once it's centered in the eyepiece you can adjust the three knobs on the front of the telrad to maneuver the red telrad circles so that the Moon is also centered.
If there's no Moon available, just take the scope out during the day and find a far away tree branch, roof or window and do the same.
I hope this helps!
Suresh
Suresh Sreenivasan
B-SIG/FB/Metcalf Comm
Refr: AP 130mm GTX/SW 120mm/Borg 4"/Unitron 150 4"/Jason 2.25”
Dobs: ATM 16"/Orion 12”
Newts: Cave 8" RFT/Criterion RV6/Astroscan 4"/Orion 3.6" TCT
SNs: Meade 6"/Celestron 5.5"
SCTs: Celestron 9.25"/8”/B&L Criterion 4”
Maks: SW 7"/Quantum 4"/Meade 3.5” ETX
Cass: Vixen 8” VISAC/Simmons 4.5"
RC: MallinCam 10"
Sol: Lunt 80mm DS/PST
Bino: Vixen 12x80/Nikon 10x50
Mounts: CGX/EQ6r-Pro/AVX/GDPX/Porta II
B-SIG/FB/Metcalf Comm
Refr: AP 130mm GTX/SW 120mm/Borg 4"/Unitron 150 4"/Jason 2.25”
Dobs: ATM 16"/Orion 12”
Newts: Cave 8" RFT/Criterion RV6/Astroscan 4"/Orion 3.6" TCT
SNs: Meade 6"/Celestron 5.5"
SCTs: Celestron 9.25"/8”/B&L Criterion 4”
Maks: SW 7"/Quantum 4"/Meade 3.5” ETX
Cass: Vixen 8” VISAC/Simmons 4.5"
RC: MallinCam 10"
Sol: Lunt 80mm DS/PST
Bino: Vixen 12x80/Nikon 10x50
Mounts: CGX/EQ6r-Pro/AVX/GDPX/Porta II
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- Posts: 98
- Joined: Wed Sep 16, 2020 1:23 am
- Real Name: jessica palmer
- Location: Saint Paul
Re: Telrad
Thanks! I'll give that a try. But first I need to actually attach the base to the scope.
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- Posts: 98
- Joined: Wed Sep 16, 2020 1:23 am
- Real Name: jessica palmer
- Location: Saint Paul
Re: Telrad
The adhesive is kind of intimidating...I feel like there's no room for error.
- SEmert
- Posts: 1802
- Joined: Mon May 31, 2004 2:48 pm
- Real Name: Steve Emert
- Location: White Bear Lake, MN
Re: Telrad
Don't be intimidated. It's easy, and even if you get it totally crooked you can get it back off by sawing through the foam tape with a piece of dental floss, then rubbing the rest of it off with your thumb. More tape is available at hardware stores or Menards and elsewhere.
But to get it straight, what I do is tape a piece of string along the length of the optical tube assembly all the way from front to back, right next to where you want to mount the Telrad. That way you can use it as a guide in lining it up. When you've got it lined up, just press it down and it's mounted.
When aligning the Telrad, just like any finder scope, be sure to first sight on something distant with the scope then adjust the knobs on the Telrad to sight it in on what the scope is seeing. Very difficult the other way around!
But to get it straight, what I do is tape a piece of string along the length of the optical tube assembly all the way from front to back, right next to where you want to mount the Telrad. That way you can use it as a guide in lining it up. When you've got it lined up, just press it down and it's mounted.
When aligning the Telrad, just like any finder scope, be sure to first sight on something distant with the scope then adjust the knobs on the Telrad to sight it in on what the scope is seeing. Very difficult the other way around!
Steve Emert
MAS Membership Coordinator
12.5" f/4.7 Obsession Clone Homemade Truss Dob, sometimes equipped with Celestron StarSense Explorer app
Celestron C8 SCT OTA on AVX GEQ mount
Astro-Tech AT72 ED Refractor OTA usually on Explore Scientific Twilight 1 mount or tripod with Benro geared head
Celestron 5" SCT OTA on Explore Scientific Twilight 1 Alt-Az Mount, usually equipped with StarSense Explorer app
Orion 150mm Mak OTA and Orion EQ-G computerized mount
MAS Membership Coordinator
12.5" f/4.7 Obsession Clone Homemade Truss Dob, sometimes equipped with Celestron StarSense Explorer app
Celestron C8 SCT OTA on AVX GEQ mount
Astro-Tech AT72 ED Refractor OTA usually on Explore Scientific Twilight 1 mount or tripod with Benro geared head
Celestron 5" SCT OTA on Explore Scientific Twilight 1 Alt-Az Mount, usually equipped with StarSense Explorer app
Orion 150mm Mak OTA and Orion EQ-G computerized mount
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- Posts: 98
- Joined: Wed Sep 16, 2020 1:23 am
- Real Name: jessica palmer
- Location: Saint Paul
Re: Telrad
Thank you for replying! I will definitely try the dental floss trick. I feel a little more confident about installing it now.