9" refractor lens set on ebay

[doppler]

Saw this on ebay, what a monster lens.

"Bousch & Lomb 9 inch Telescope / Camera Lens

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."


http://www.ebay.com/itm/Bousch-Lomb-9-inch-Telescope-Camera-Lens-/221286317413?pt=US_Telescopes&hash=item3385b13d65

[LewisM]

I can see Brian figuring out OTA lengths as we speak...

[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.net/Product-Line/Optical-Sets/LZOS-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.

[doppler]

It would be nice but the old one is $950 us and the newer one is $39000 au

APM - LZOS Apo-Refraktoren - 228 f/9 Apochromat, Lens in Cell

http://www.apm-telescopes.de/media/images/info/LZOS228-LENS.jpg (http://www.apm-telescopes.de/media/images/popup/LZOS228-LENS.jpg)

volume weight: 130,00 kg
delivery time: 3-4 weeks
product number: LZOS-228-2050-T
32.990,00 EUR
incl. 19 % VAT excl. shipping costs (http://www.apm-telescopes.de/en/Shipping-Returns.html)
Netto Export Preis: 27.722,69 EUR

[Wavytone]

Mmmm... There's a reason it's only $900...

Bear in mind a 10" dob or SCT will outperform this, on all scores.

[doppler]

I was wondering what a 9" f18 refractor would look like. Found this image, not quite f18.

9" F/14.8 1915 Alvan Clark in it's transportable tube assembly

[Kunama]

Here is another 9" F15 2012 model Oddie II 22mm F15 Istar achromat

http://i13.photobucket.com/albums/a293/OZBMW/OddieRefractorx1cn_zpsf66ca536.jpg (http://s13.photobucket.com/user/OZBMW/media/OddieRefractorx1cn_zpsf66ca536.jpg. html)

[brian nordstrom]

:lol: MMMM ,:question: , it would be a beast would it not ?
I would fold the fl to make it much more manageable .

Brian.

[brian nordstrom]

:shrug: 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.

[brian nordstrom]

:question: 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.

[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.

[brian nordstrom]

:rofl: 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.

[hotspur]

certainly an interesting thread,some amazing images of really big refractors!

[MattT]

Thats what I'll be doing shortly Lewis.
Just received an Istar 6" f12 achro lens :D ATMing here I come.
Matt

[doppler]

That 16" f/7 dob would be a long tube...the budget brands only do f/5 on anything bigger than an 8" reflector.

Here is a pic of a 16" f/6

[LewisM]

There is another 150 SW achromat locally, on an EQ5 mount, for only $700. I am sorely tempted, but I wont.

I have my FL102S for visual now - don't need ANYTHING else.

Dobsonians leave me cold. Just don't like em. Even pushing an EQ mount around manually is far more enjoyable to me