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View Full Version here: : Did someone say long FL refractor?


MortonH
18-03-2014, 12:45 AM
5" f/20 scope on Astromart. Tube is 10 feet long!

http://www.astromart.com/classifieds/details.asp?classified_id=849883

AG Hybrid
18-03-2014, 12:49 AM
Yeah.... You should get to a point where you need to decide to either buy a triplet APO or a Mak-Cass if you want color correction and or long FL.

Judging by those pictures if you pointed towards zenith, you would be looking through the eyepiece while on your belly.

glend
18-03-2014, 03:31 AM
Whow, the CA should be almost non-existent at that length.
Agreed it needs a taller tripod but a pier in a proper obs might be better.

LewisM
18-03-2014, 05:34 PM
Needs a perimeter fence around it for when it slews to new targets, with warning tape ;)

I reckon Kunama's FC76 might get that long by the time he's done ;) Only a matter of time till he adds the 2x extender section :) (sorry Matt, couldn't resist)

Hans Tucker
18-03-2014, 06:48 PM
My f/12 APO is an enough of a handful.

pgc hunter
19-03-2014, 11:03 PM
I want it. But doing the math, it is nearly twice as long as a 4" F/15 and I thought those were loooong :help:

mr bruess
21-03-2014, 03:29 AM
longer than a Unitron refractor.Could it outperform a unitron?