#1
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Sources For OTA...
My club is converting a 26" truss dob newtonian into a cassegrain for
our observatory. The primary was orignally in a cassegrain so the central hole is already there. We need an OTA for the project and assume it will have to be custom made. Any suggestions on suppliers? Thanks, Dave |
#2
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Sources For OTA...
Parallax ...
"Dave Gede" wrote in message om... My club is converting a 26" truss dob newtonian into a cassegrain for our observatory. The primary was orignally in a cassegrain so the central hole is already there. We need an OTA for the project and assume it will have to be custom made. Any suggestions on suppliers? Thanks, Dave |
#3
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Sources For OTA...
Hi Dave,
I used to own a 26" truss tube dob with a central hole in the primary. Did you buy it from a guy in Kentucky? A 26" mirror w/center hole is an unusual mirror size/configuration, so if it is my old scope and primary, I have information about it you might like to know. Jim Dave Gede wrote: My club is converting a 26" truss dob newtonian into a cassegrain for our observatory. The primary was orignally in a cassegrain so the central hole is already there. We need an OTA for the project and assume it will have to be custom made. Any suggestions on suppliers? Thanks, Dave |
#4
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Sources For OTA...
Jim,
No...this mirror was originally surplus from the JPL here in the Baltimore area. It was actually rescued from the scrap heap, refigured and recoated. Since the club had no observatory, it made sense to put it in a truss dob rather than the Cassegrain. We are building an obseratory so now was the time to convert it back. The actual dimensions are 25.657". Thanks for the response though. Regards, Dave Hi Dave, I used to own a 26" truss tube dob with a central hole in the primary. Did you buy it from a guy in Kentucky? A 26" mirror w/center hole is an unusual mirror size/configuration, so if it is my old scope and primary, I have information about it you might like to know. Jim Dave Gede wrote: My club is converting a 26" truss dob newtonian into a cassegrain for our observatory. The primary was orignally in a cassegrain so the central hole is already there. We need an OTA for the project and assume it will have to be custom made. Any suggestions on suppliers? Thanks, Dave |
#5
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Sources For OTA...
Ooop...After my post I got corrected by another club member. While
the cell that the mirror is in is 26" the actual mirror is 24.657 not 25.657. My fault...I wrote down the wrong numbers at the last meeting. Not a big deal...just a big OTA! :-) Dave Hi Dave, I used to own a 26" truss tube dob with a central hole in the primary. Did you buy it from a guy in Kentucky? A 26" mirror w/center hole is an unusual mirror size/configuration, so if it is my old scope and primary, I have information about it you might like to know. Jim Dave Gede wrote: My club is converting a 26" truss dob newtonian into a cassegrain for our observatory. The primary was orignally in a cassegrain so the central hole is already there. We need an OTA for the project and assume it will have to be custom made. Any suggestions on suppliers? Thanks, Dave |
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