Re: [ATM] TDE on a 6f6 mirror

[Dale Eason <atmpob@yahoo.com>]

There is the possibility that the camea lens is
vignetting the right side of returning light cone. 
That happens a lot with small cameras with zoom
lenses. It can also happen if the camera lens is not
close enough to the knife.

To know for sure back the knife out of the image and
then take a picture.  If the mirror is not fully
illuminated then that is indeed the case.  If the
mirror is completly lit then then edge is turned.

Dale Eason

--- Anthony Anconetani
<anthony.anconetani.atm@gmail.com> wrote:

> Good morning all,
> 
> On my initial try at figuring my 6f6 mirror I
> managed to dig a pretty
> deep hole. So as I've had time, I've been working
> the surface back to
> sphere. On my way back to sphere, I came to a point
> where all the
> zones were actually correct for a parabola. The edge
> did not look
> perfect but I figured I'd take a picture to collect
> the groups
> opinions.
> 
> Well, I captured some pictures. In the pictures the
> edge looks really
> bad.  So here is the first picture at zone 3.
> 
>
http://www.atmlist.net/contrib/anthony-dot-anconetani-dot-atm-at-gmail-dot-com/tde_crop.JPG
> 
> Some questions:
> 
> 1) Am I correct in thinking this looks like a badly
> turned down edge?
> 
> 2) If yes to 1: It doesn't look that bad when I look
> without the
> camera. Should I believe my eye or the camera?
> 
> Lastly, I took a second picture with a little bit of
> light behind me.
> In this second picture you can faintly see through
> the mirror.
> 
>
http://www.atmlist.net/contrib/anthony-dot-anconetani-dot-atm-at-gmail-dot-com/tde_background_crop.JPG
> 
> 3) Is it possible that the bright left side of the
> mirror is actually
> a faint reflect from the inside side of the mirror
> blank? hehehe...
> it's worth a shot... 8-)
> 
> Thanks,
> 
> -Anthony, Round Rock TX
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> ATM mailing list http://www.atmlist.net/
> 



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