Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version B 2.10.3 4.3bsd-beta 6/6/85; site decwrl.DEC.COM
Path: utzoo!watmath!clyde!burl!ulysses!gamma!epsilon!zeta!sabre!petrus!bellcore!decvax!decwrl!dec-rhea!dec-nrlabs!naticchioni
From: naticchioni@nrlabs.DEC
Newsgroups: net.astro.expert
Subject: Large aperture vs. small for nebular viewing.
Message-ID: <1146@decwrl.DEC.COM>
Date: Fri, 14-Feb-86 07:34:21 EST
Article-I.D.: decwrl.1146
Posted: Fri Feb 14 07:34:21 1986
Date-Received: Sat, 15-Feb-86 04:51:54 EST
Sender: daemon@decwrl.DEC.COM
Organization: Digital Equipment Corporation
Lines: 31





	I AM INTERESTED IN BUILDING A 13 TO 14 IN REFLECTING TELESCOPE FOR 
DEEP SKY VIEWING OF NEBULARS.  I HAVE A 4.25" F/10 NEWTONIAN THAT I USE NOW
FROM 35X TO 200X BUT WOULD LIKE A WIDER FIELD OF VIEW AND A BRIGHTER IMAGE.
	THERE ARE SEVERAL COMPANIES THAT SELL LIGHTWEIGHT 1/8 WAVE MIRRORS
AT F/4.5 TO F/6 AND THEY CLAIM THIS IS WHAT I WANT.  I AM HOPING TO KEEP
THE COST OF THE SYSTEM BOTH IN TIME AND MONEY MINIMAL BUT STILL HAVE A GOOD
VIEW. THE SHORT FOCUS NEWTONIAN SEEMS TO BE THE WAY TO GO BUT I HAVE BEEN
READING THAT A SMALLER MORE ACCURATE MIRROR WITH A LONGER F RATIO IS BETTER.

	IS THERE A TRADE OFF POINT IN SIZE, ACCURACY, AND F RATIO?

	I WOULD LIKE ANY RECOMENDATION ON WHAT OTHERS HAVE USED AND WHY?

	IS THERE ANY GOOD REFERENCES I COULD USE?

	ANY DATA OR FORMULAS WOULD ALSO BE APPRECATED.

				THANKYOU FOR YOUR HELP
				STEVEN M. NATICCHIONI
				DIGITAL EQUIPMENT CORP.
				NRO5/F2
				30 FORBES ROAD
				NORTHBORO, MA    01532
				(617) 351-4862 	
P.S. "A LITTLE EXPERIENCE REPLACES A LOT OF THEORY!"

	NRLABS::NATICCHIONI