5 element 4.5" RFT refractor OTA

[TomB]

For sale or trade, a 5 element 4.5" RFT refractor OTA created from a NASA photo lens. The objective is 6" in the first 3 elements, coupled with 2 elements which act as a corrective Barlow. The result is a 30" refractor. It is not a true 6" as there is vignetting resulting in an effective 4.5" aperture. Although it has good colour correction, I hesitate to call it apochromatic as it pre-dated the era of triple-element APOs. It really is best at rich field and is not intended for high power. I imported it from USA and paid US$200 for the OTA (excl shipping). It weighs a hefty 16 lb of glass plus tube and 2"+ Jaegers focusser, but easily sits on any 6"-capable mounting.

My reason for sale is storage and that I now have a glut of RFT refractors so something has to go. So I'd be happy to discuss trade or sale. One thing I could use is an 8in SCT or a 6in Mak to use on my urban Chatswood balcony, if anyone happened to want to part with such & take this as part trade-in. I have two 10 inch Newts, several 3in refractors, and a C-5 so don't need anything in those categories. Open to other suggestions.

[mill]

Hmm now i see it.
Is US$200 Really the right price? Or should it be US$2000 ?

[TomB]

Maybe it was $US250 plus shipping. That was in the 80s. It's not a direct equivalent to a modern apochromat but in the right hands makes a great RFT and would probably do even better in its original incarnation for photography.

[PhotonCollector]

Sounds interesting....
What f/ratio is it?
Do you have any pics of what this RFT looks like or any pics that you have taken with it ?

[mill]

Tom i am still waiting for an answer on my pm.
If you dont want to sell just say so please.

[mill]

Hmm 4 days now and no reply.
It looks like Tom doesnt want to sell.

[ballaratdragons]

Mill, he may not have PM activated, or email notification of PM activated :shrug:

[mill]

Pm is activated because he has send me an pm a while ago after i pm'd him.
Well something might have happened that needs his attention:shrug:

[g__day]

Love to see a picture of this thing.

Hey Martin - what sort of swords do you collect, looks at tad like a dai-katana there

[mill]

Hi g_day it is an dai katana with just the most beutifull hamon i have ever seen.
Just a pity it isn't mine (costs more than a small car).
I only collect katana's from the edo period.
But now i do astronomy i had to give up the collecting :)
Doing both is too expensive :P

It looks like this item is not for sale anymore:(
Havent heard from TomB at all.
It would have been a nice scope for imaging.

[netwolf]

Martin, I initially did get a reponse from TomB to a pm when this add first appeard, but i don't think he has been online since then.
Sent him an email.

Regards

[g__day]

Martin,

I've never seen a real dai-katana, but I had a few special books on katana's when I did a bit of aki-jitsu in a subfield of aikido. Incredibly beautiful swords that live up to the legends you sometimes see on tv. Ever see the video of a katana splitting high powered 50 cal rifle bullets? Shame to do that to a sword - but it split 9 bullets - that had the power to explode a body (gross what a Macmillian can do to a flesh target) - before it split.

[Inmykombi]

Hi,can you email me a photo of this refractor.
Also, what is vignetting ? and why doe sit obstruct the 6 inch lens ?
Let me know if you can send photos and I will give you my e-mail address.

cheers.
Geoff

[Inmykombi]

Is this scope still for sale.
I have had no reply to my previous question.

Please advise.
Geoff

[mill]

Inmykombie.
You are just talking to a brick wall here.
I didn't get a reply since 24-08.