[ATM] I want to make a 6" LENS diaphragm

[Gil McFarlane]

Partly to control CA (this is a Jaeger achromat) on certain subjects, and partly just for the sake of experimentation.

Gil



________________________________
 From: Dale Eason <atmpob at yahoo.com>
To: atm at atmlist.net 
Sent: Sunday, January 1, 2012 9:34 AM
Subject: Re: [ATM] I want to make a 6" LENS diaphragm
 
Gil,
If the scope is a quality scope then what is the advantage of doing that?  I don't understand why one would want less aperture since it will also give you less resolution.  I have always found that quality aperture is always more pleasing the more of it you can get. 

The only time I can see the use is when projecting the sun when I don't want to burn up the eyepiece.

Dale Eason

--- On Sun, 1/1/12, Gil McFarlane <gilboastro at yahoo.com> wrote:

> From: Gil McFarlane <gilboastro at yahoo.com>
> Subject: Re: [ATM] I want to make a 6" LENS diaphragm
> To: "hermit" <hermit at outofoptions.org>, "atm at atmlist.net" <atm at atmlist.net>
> Date: Sunday, January 1, 2012, 11:07 AM
> Ken,
> Good call!   I found this:
> http://www.ebay.com/itm/SOURCE-FOUR-LEKO-IRIS-SOURCE-4-1-/230666415738?pt=LH_DefaultDomain_0&hash=item35b4ca2e7a
> 
> I am checking with seller on the max opening.  Might
> work!
> 
> Gil
> 
> 
> 
> ________________________________
>  From: hermit <hermit at outofoptions.org>
> To: atm at atmlist.net 
> Sent: Sunday, January 1, 2012 8:31 AM
> Subject: Re: [ATM] I want to make a 6" LENS diaphragm
>  
> Gil,
> 
>      Check out theatrical lighting supplies.  You
> might find something 
> there.
> 
> Ken Lowther
> 
> On 01/01/2012 10:29 AM, Gil McFarlane wrote:
> > I realized that I do not need a full sized (6")
> diaphragm if I locate it closer to the eyepiece - with the
> smaller light cone.  Anyone aware of a source for a lens
> diaphragm (cheap)?
> >
> > Thanks,
> > Gil
> >
> >
> >
> > ________________________________
> >   From: Gil McFarlane<gilboastro at yahoo.com>
> > To: "atm at atmlist.net"<atm at atmlist.net>
> > Sent: Saturday, December 31, 2011 8:27 PM
> > Subject: [ATM] I want to make a 6" LENS diaphragm
> >
> > I like the idea of dialing up and down my objective
> size to suit the object I'm looking at with a 6" f5
> refractor.
> >
> > But I can't find one for sale - I suspect I may have
> to make one - but have no idea how - any suggestions?
> >
> >
> > (BTW, I believe that an early Televue 5" scope had a
> diaphragm for the same reason.)
> >
> > Gil
> > Ventura
> > _______________________________________________
> > ATM mailing list http://www.atmlist.net/
> > _______________________________________________
> > ATM mailing list http://www.atmlist.net/
> 
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