Re: [ATM] Making Barlows

[Jarvis Krumbein <jkoptic@juno.com>]

For many years I too have used camera teleconvertors as Barlows.  They
work very well and have an advantage when used with fast, for example
f4.5, systems.  Almost all the teleconvertors are designed to work with
much faster optical systems, typically f2.8 and faster and are well
matched to the modern DOB.

Jarvis Krumbein

On Tue, 20 Mar 2007 10:16:52 -0600 "Jerry P. Reddell"
<jerry.p.reddell63@sbcglobal.net> writes:
> I have made barlows from the 35 mm camera telelconverters. Worked 
> nice and
> were inexpensive.  I later acquired a couple of  barlows which did 
> not
> perform any better (at least to my poor eyes ).
> 
> Jerry Reddell
> 
> -----Original Message-----
> 
> Of Anthony Anconetani
> 
> 
> 
> Hi Francis and all,
> 
> I'm curious about making Barlows.
> 
> The book "Making a Refractor Telescope" by Norman Remer discusses 
> making
> refractor lens. Is it practical for an ATM to use these techniques 
> build
> their own Barlows?
> 
> Or is it just better to just buy Barlows.
> 
> Thanks guys,
> 
> -Anthony Anconetani
> 
> 
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