This is a very large lens cell with a set of lenses arragned to yeild an effective focal length of 168" (4267mm) or 14 ft. It appears to be a military design and most like was military surplus. It is an f/ 18 which would make it an awesome planet killer. The set is encased in a steel cell which is very heavy ( 82 lbs.) so you might want to remount the lenses. The front lens has some discoloration on the surface and there are a couple of small scratches in the coatings but overall the lens is very useable.
It comes in a metal case to securely keep it.
If you are looking to build a unique and massive observatory telescope that will be the envy of all your friends, here it is."
If I was looking for a large objective I'd be looking for something more modern - Better glass, antireflection coated, and faster focal ratio. Starting with these gems http://www.professional-telescopes.n...OS-Apochromats and from a reputable maker.
I wouldn't be taking a punt on an old uncoated achro objective with no credible documentation concerning its quality, that big.
Hey Wavey , its a 'Military' spec B&L it will be a very nice lense for that price , old does not necessarily mean bad as lots of people today seen to think .
If I still had my engineering business I would jump at this as Lewis says , but sadly ,, no .
Brian.
Quote:
Originally Posted by Wavytone
If I was looking for a large objective I'd be looking for something more modern - Better glass, antireflection coated, and faster focal ratio. Starting with these gems http://www.professional-telescopes.n...OS-Apochromats and from a reputable maker.
I wouldn't be taking a punt on an old uncoated achro objective with no credible documentation concerning its quality, that big.
What we might have to do Matt ,is drag Wavy and a 10 inch Dob and a 10 inch SCT up here when its completed eg. finally mounted on its refurbished mount when they have their next public open night ??? would be fun now wouldn't it ? comparing the views . .
Brian.
Quote:
Originally Posted by Kunama
Here is another 9" F15 2012 model Oddie II 22mm F15 Istar achromat
Hehe Brian, I used the Oddie most Monday nights for 4 years... I know full well what a 9" f/16 achro is like. I also know what long reflectors can do too, and a 16" f/7 dob is a hell of a lot better choice as well as a lot easier to mount and use.
well done , but that was the old Oddie , this new one with the Istar lense will be lots better , I hope you get a chance to look thru the new one when its finished , it sounds like you are the one to see any differences .
Look forward to that , if possible .
Brian.
Quote:
Originally Posted by Wavytone
Hehe Brian, I used the Oddie most Monday nights for 4 years... I know full well what a 9" f/16 achro is like. I also know what long reflectors can do too, and a 16" f/7 dob is a hell of a lot better choice as well as a lot easier to mount and use.
MMMM ,
, it would be a beast would it not ? 
Hey Wavey , its a 'Military' spec B&L it will be a very nice lense for that price , old does not necessarily mean bad as lots of people today seen to think .
.
well done , but that was the old Oddie , this new one with the Istar lense will be lots better , I hope you get a chance to look thru the new one when its finished , it sounds like you are the one to see any differences .
ATMing here I come.
