So, I received and setup my first telescope this weekend. It all went quick and easy since it was nearly identical to the MAS scope I'd loaned recently. However, it came with a few different draw tubes and I'm wondering what the difference is between them. They have the same openings on either end, but are differently shaped, and one of them has only one tightening screw. Any ideas?
See attached pics.
A question about draw tubes.
Moderators: defalkner, Sureshks, SEmert
- dhawley
- Posts: 15
- Joined: Fri Jan 01, 2021 9:10 am
- Real Name: Darin Hawley
A question about draw tubes.
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Darin Hawley, MAS Member Since 01/2021
SkyWatcher Classic 200P 8" Dobsonian (first scope!)
SkyWatcher Classic 200P 8" Dobsonian (first scope!)
- Sureshks
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Re: A question about draw tubes.
Hi,
The one on the right looks like a standard 1.25" eyepiece adapter.
I'm not sure exactly what the one on the left is. But it might be for astrophotography... to run a nose piece thru and lock it with two screws.
What type of scope is it? Maybe that would help.
Suresh
The one on the right looks like a standard 1.25" eyepiece adapter.
I'm not sure exactly what the one on the left is. But it might be for astrophotography... to run a nose piece thru and lock it with two screws.
What type of scope is it? Maybe that would help.
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
- Huggy
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- Real Name: Ken Hugill
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Re: A question about draw tubes.
It looks like they allow different focal length objectives to be used. The right one is low profile and the left one is high profile. If you cannot get your object in focus with one, then try the other.
LLCC Committee Chair
Key Holder - All
Primary gear:
20" F4 DOB Galaxy Mirror
C-11 Hyperstar and CGX-L
ZWO ASIair Pro 294C cooled
25x100 Bino
kenhugill@comcast.net
Key Holder - All
Primary gear:
20" F4 DOB Galaxy Mirror
C-11 Hyperstar and CGX-L
ZWO ASIair Pro 294C cooled
25x100 Bino
kenhugill@comcast.net
- dhawley
- Posts: 15
- Joined: Fri Jan 01, 2021 9:10 am
- Real Name: Darin Hawley
Re: A question about draw tubes.
Oh right! I'm attaching a snapshot of my NEW TELESCOPE. It's a SkyWatcher Classic 200P 8" Dobsonian. The instruction manual was completely unhelpful as only generically refers to eyepiece adapters. I purchased separately a T-ring adapter for astrophotography, and figuring that out will probably be my NEXT post.
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Darin Hawley, MAS Member Since 01/2021
SkyWatcher Classic 200P 8" Dobsonian (first scope!)
SkyWatcher Classic 200P 8" Dobsonian (first scope!)
- dhawley
- Posts: 15
- Joined: Fri Jan 01, 2021 9:10 am
- Real Name: Darin Hawley
Re: A question about draw tubes.
I sorta wondered if that might be it. Thanks, Huggy.
Darin Hawley, MAS Member Since 01/2021
SkyWatcher Classic 200P 8" Dobsonian (first scope!)
SkyWatcher Classic 200P 8" Dobsonian (first scope!)
- matt_2018
- Posts: 60
- Joined: Tue May 15, 2018 11:56 am
- Real Name: Matt Dunham
Re: A question about draw tubes.
I like having the double set-screws on my star diagonal or straight eyepiece receiver because they act as redundant screws to prevent the eyepiece from falling out. They are especially helpful if you have a heavy object such as a camera mounted which you might be fiddling with a lot.
Matt Dunham
MAS Treasurer & member since 2018
Meade LX200RC 12-inch (my portable observatory)
Celestron SC-8" w/fork wedge (my travel scope)
MAS Treasurer & member since 2018
Meade LX200RC 12-inch (my portable observatory)
Celestron SC-8" w/fork wedge (my travel scope)