Wait for it ...Yes .. 9inch f/18 Refractors.

[FlashDrive (Poppy)]

I was browsing Cloudy Nights today and came across these 9 inch / f18 Refractors.

A definite Planet Killer..... would love to have a look with one of these.

Credit to the original poster of these photo's.

Here is the link if you wish to have a further read.

http://www.cloudynights.com/ubbarchi...fpart/all/vc/1

Flash

[2stroke (Jay)]

If your ever down far south drop in MPAS greg has a crazzy sized one there, though i can't remember the specs i'am pretty sure its an 8" with near the same F ratio http://www.mpas.asn.au/ lol just trying to find a pic on the site for you, are well my wifes facebbok will have to do

[asimov (John)]

Ha! I saw this a few yrs ago now, & only remembered it 3 days ago, so went in search of the thread on CN so I could post the link for some guys on another forum & here it is!!

Thanks Flash!

[Omaroo (Chris Malikoff)]

Plant killer? I'll bet!

[lacad01 (Adam)]

Wow impressive...but what's a plant killer

[AstralTraveller (David)]

Originally Posted by lacad01

Wow impressive...but what's a plant killer

Planet killer

You'd certain have to love narrow-field viewing. By my calcs your widest fov would be 40 arc minutes. A 20mm ep is 200x and a 15mm is already 270x.

[Peter Ward]

Plant killer.

Yes, that's exactly what this is.

Impossible to mount... so you might as well beat weeds to death with it.

Why anyone would make a F18 refractor these days is beyond me.

[Peter Ward]

Originally Posted by Hans Tucker

Sorry Peter but this comes across as a rather snobbish opinion.

No. Not snobbish ..in the same way you could make a balsa-wood raft and cross the south pacific... why?

High index glasses make extremely long focal lengths an anachronism.

My old club had a 6" f12 behemoth. might *still* have it...

My AP155 runs rings around it: much easier to mount and better corrected to boot.

Mechanical centration of 9" F18 optics I strongly suspect is an approximation at best.

[brian nordstrom (As avatar)]

Roundup ?.
Brian.

Originally Posted by lacad01

Wow impressive...but what's a plant killer

[brian nordstrom (As avatar)]

love to own one Hans , but not everyone's a millionare....
Brian

Originally Posted by Peter Ward

No. Not snobbish ..in the same way you could make a balsa-wood raft and cross the south pacific... why?

High index glasses make extremely long focal lengths an anachronism.

My old club had a 6" f12 behemoth. might *still* have it...

My AP155 runs rings around it: much easier to mount and better corrected to boot.

Mechanical centration of 9" F18 optics I strongly suspect is an approximation at best.